Threading device for a sewing machine.

专利摘要:
The invention relates to a threading device for a sewing machine, comprising hermetic lips (7) capable of making hermetic contact with a peripheral band-shaped area of the needles (1a, 1b, 1e-1g). The peripheral band ring-shaped area surrounds the thread exits from needle eyes of the needles. The threading device further comprises: a corresponding peripheral band-ring-shaped block (24) surrounding suction mouth openings (6a-6e) which suck air from the thread exits (5a-5e) of the needle eye of the needles; a needle thread suction pipe connected to the suction orifices (6a-6e) of the hermetic lips (7); a position switching mechanism which, when threading the needle (1a, 1b, 1e, 1f, 1g), moves the hermetic lips (7) into a threading position so that the hermetic lips (7) are in contact with the needle (1a, 1b, 1e, 1f . withdraws and moves the hermetic lips (7a-7e) to a standby position; and a pump which, when the needle thread suction line pipes are connected to a suction port, one end of the thread to be introduced into the thread entrances of the needle eye of the needles during needle threading from the thread exits of the needle eye of the needles via the suction mouth openings (6a-6e) by means of the needle thread suction pipe into the suction opening, whereby one end of the thread is threaded through the needle eye of the needles.
公开号:CH713418B1
申请号:CH00760/18
申请日:2016-06-30
公开日:2021-11-15
发明作者:Sakuma C/O Suzuki Manufacturing Ltd Tohru；Suzuki C/O Suzuki Manufacturing Ltd Mitsuharu；Kudo C/O Suzuki Manufacturing Ltd Shigenori；Satou C/O Suzuki Manufacturing Ltd Mitsuro
申请人:Suzuki Mfg；
IPC主号:

专利说明:

TECHNICAL AREA
The present invention relates to a pneumatic needle threading device for a sewing machine for threading a needle thread, wherein a gas feed to a needle of a sewing machine (hereinafter also a sewing machine needle) such as a lockstitch sewing machine, an overcasting machine, a double chainstitch sewing machine or a cover stitch sewing machine is used.
STATE OF THE ART
Conventionally, in lockstitch sewing machines, overcasting machines, double chainstitch sewing machines or cover stitch sewing machines, etc., mechanical aids for needle threading and devices for threading a needle thread into a needle are commonly used in general. In addition, pneumatic needle threading devices are proposed which use gas conveyance in ejector form for threading the needle thread into the needle.
On the other hand, there are proposed pneumatic needle threading devices which use a suction form gas conveyance for threading the needle thread into the needle (see Patent Documents Nos. 1 to 6).
PRIOR ART DOCUMENTS
PATENT DOCUMENTS
[Patent Document No. 1] US 2413014 B [Patent Document No. 2] JP 48-9609 B (= JP 00706285 B) [Patent Document No. 3] JP 55-54993 A [Patent Document No. 4] US 3599587 B [ Patent Document No. 5] JP 55-53079 U (= US 4198915 B) [Patent Document No. 6] US 5345888 B
SUMMARY OF THE INVENTION
PROBLEM TO BE SOLVED BY THE INVENTION
In the disclosed in the patent documents 1 to 6 pneumatic Nadeleinfädelvorrichtungen that use a gas transport in suction form, there is the possibility of threading the needle in a needle eye of the sewing machine needle in a way that compared to a pneumatic needle threading, which a gas transport in Ejection form used, is relatively stable.
In the pneumatic Nadeleinfädelvorrichtungen disclosed in the patent documents 1 to 6, which use a gas conveyance in suction form, however, connects in practice a peripheral part, the suction in the Nadeleinfädelvorrichtung the needle eye of the sewing machine needle (hereinafter: the suction needle eye) surrounds, not closely to the circumference of the aspirating eye of the needle. As a result, the needle threading device sucks not only from the eye of the needle that should actually be sucking, but also from an interface at which the close connection between the peripheral part that surrounds the suction needle eye and the circumference of the suction needle eye is incomplete. As a result, it is not possible, with the suction amount of the pump, which is driven by a sewing machine motor, as it is often used, from the needle eye, which should mainly suck, to obtain a suction force which is sufficient for threading the needle thread.
Thus, at present there is no concrete embodiment of a pneumatic needle threading device using suction-form gas conveyance, and there is a problem that it is not currently available or commercially available in the market.
The present invention was developed to remedy these deficiencies. An object of the present invention is to provide a pneumatic needle threading device for a sewing machine for threading the needle thread in suction form, in which the sewing machine needle is sucked only from the needle eye, using a gas feed to a needle of a sewing machine such as a lockstitch sewing machine, an overcasting machine , a double chainstitch sewing machine or a deck stitch sewing machine.
Furthermore, it is an object of the present invention to provide a pneumatic needle threading device for a sewing machine for threading the needle thread in suction form, in which only from the needle eye can be sucked, using gas conveyance to the sewing machine needle, reducing the fluid resistance and providing Sufficient suction power with the suction rate of the pump, which is driven by a frequently used sewing machine motor.
Furthermore, it is an object of the present invention, together with the pneumatic needle threading device for a sewing machine, for threading the needle thread in suction form in which the sewing machine needle is sucked only from the needle eye by carrying out gas delivery to the sewing machine needle described above, also to provide a pneumatic looper threading device for a sewing machine for threading the looper thread in eject form, in which an ejection in the direction of the looper hole of the looper (hereinafter only looper hole) of the sewing machine is carried out using a gas conveyance.
It is also an object of the present invention to provide a pneumatic needle threading device for a sewing machine, in which the pneumatic needle threading in the form of a suction starting from the needle eye and the pneumatic hook threading into the looper hole are carried out in ejection form, with the suction for gas conveyance and using the output of only a single pump driven by the sewing machine motor.
MEANS TO SOLVE THE PROBLEMS
In order to achieve the above-mentioned objects in a pneumatic threading device for a sewing machine comprising a stitch forming device with a sewing machine needle and a loop gripping device, the loop gripping device forming the stitches by engulfing a needle thread threaded into a needle eye by interacting with the needle , and wherein the pneumatic threading device pneumatically performs threading into the needle eye of the needle, a threading device for a sewing machine according to the present invention comprises: a hermetic lip which can be brought into hermetic contact with a peripheral annular region of the needle, the peripheral bath-ring-shaped area surrounds a thread exit of the needle eye and the hermetic lip has a corresponding peripheral band-ring-shaped block which surrounds a suction mouth opening, for suction from the thread exit of the needle eye, a needle elf aden suction pipe, which is connected to the suction mouth opening of the hermetic lip, a position switching mechanism with which the hermetic lip can be moved to a threading position at the time of needle threading, so that the suction mouth opening is aligned with the thread exit of the needle eye and comes into contact with the needle , and with which the hermetic lip is movable to a standby position at the time of stitch formation by being withdrawn from the needle, and a pump, wherein the needle thread suction pipe is connected to a suction port of the pump, such that the pump threading the needle into passes through the needle eye of the needle by sucking an end of the needle thread inserted into a thread entrance of the needle eye of the needle at the time of needle threading through the suction mouth from the thread exit of the needle eye through the needle thread suction pipe to the suction port.
The needle has a concave part for passing a loop taker point of the loop grasping means in an upper part of the eye of the needle, and a peripheral band ring-shaped portion comprising: an upper band portion part of a flat shape, which is a central part of the concave part intersects and extends horizontally, a lower semicircular band area part which intersects a lower part of the eye of the needle and extends horizontally, and two side band area parts which connect the upper band area part with a flat shape and the lower semicircular band area part and extend vertically and in the circumferential direction, the peripheral band ring-shaped block of the hermetic lip accordingly comprising: an upper band segment of flat shape extending horizontally, a lower semicircular band segment extending horizontally, and two side band segments which connect the upper flat-shaped belt segment and the lower semicircular belt segment to each other and extend vertically and in the circumferential direction.
In one embodiment of the threading device for a sewing machine according to the present invention, the hermetic lip is made of a material selected from flexible rubbers, plastics and corks.
In an embodiment of the threading device for a sewing machine according to the present invention, the hermetic lip is made of the above material that does not impair flexibility.
In an embodiment of the threading device for a sewing machine according to the present invention, the following is provided between the needle thread suction pipe and the pump: a separator having a thread stop wall against which the needle thread impinges caused by the suction from the needle thread suction pipe and a space that prevents the flow speed of the air hitting the thread stopping wall from being slower than the speed of the flow being carried by the suction to the pump and the needle thread being hit by the thread stopping wall is stopped, is sucked to the pump.
In an embodiment of the threading device for a sewing machine according to the present invention, the position switching mechanism comprises: an operating part which, through primary manual operation, that is, manual operation of the manual operating lever of the pneumatic needle threading device, forms a preparatory position leading to a preparatory state for needle threading and that holds the preparation position, and a lip positioning part that is moved with the operating part and starting from the preparation position at a predetermined needle threading time, depending on a secondary manual operation, that is, a manual operation of the handwheel of the lip positioning part, a Forms a threading position that becomes a needle threading state of needle threading.
In an embodiment of the threading device for a sewing machine according to the present invention, the operating parta manual operating lever which is operated manually, anda transmission part which is connected to the manual operating lever and holds the preparation position by a hook, and which has the lip positioning parta control part which is movable by the transmission part, is elastically urged by a spring, forms the threading position at a certain needle threading time depending on the secondary manual operation, which becomes the needle threading state of the needle threading, attaches the hermetic lip and thus moves the hermetic lip that the suction mouth opening is aligned with the thread exit of the needle eye of the needle and touches the needle.
In an embodiment of the threading device for a sewing machine according to the present invention, the lip positioning part comprises: a control pin, a control plate that regulates movement of the control pin, and a positioning pin that pierces the control plate and a washer with a notched Touches part that is driven by synchronizing it with the needle.
The positioning pin is displaced in the axial direction when it is inserted into the notched part as a function of the secondary manual actuation, the control plate pivots to move the hermetic lip through the control part in such a way that the suction mouth opens onto the thread exit of the eye of the needle The needle is aligned and the hermetic lip is touching the needle.
In an embodiment of the threading device for a sewing machine according to the present invention, there are a plurality of needles, the plurality of needles being divided into at least two groups, and a flow channel selection device is provided that selects each needle of the two groups and with the The suction port of the pump connects.
In one embodiment of the threading device for a sewing machine according to the present invention, it also comprisesa looper thread insertion entrance to which a discharge port of the pump is connected,a looper thread guide conduit which is connected to the looper thread insertion port and conveys one end of the looper thread which is inserted into this looper thread insertion port by compressed air from the discharge port,a looper thread connection conduit tube which is inserted in the nested state into the looper thread guide conduit tube and which touches the hook hole entrance of the hook (hereinafter only the hook hole entrance) at the time of hook threading, anda pipe connecting mechanism that causes the looper thread connecting pipe to touch the looper hole entrance and performs the looper threading into the looper hole through the looper thread connecting pipe via the looper thread guide pipe from the looper thread insertion entrance, with one end of the looper thread (3f -3h) is inserted into the looper thread insertion inlet (35), and the looper thread connecting pipe is separated from the looper hole inlet when the stitch is formed by the stitch-forming device (4) in cooperation with the gripper (2), by entwining the needle thread ( 3a-3e) which is threaded into the eye of the needle (1c-1j) and the looper thread (3f-3h) which is threaded into the looper hole (2d-2f).
In an embodiment of the threading device for a sewing machine according to the present invention, the conduit connection mechanism comprises: another operating part attached to a sewing machine bed for positioning the looper threading in a preparatory position and the To hold the looper threading in the preparatory position, and a looper threading positioning part to position the looper threading at a predetermined looper threading time depending on the secondary manual operation from the preparatory position to a looper threading position.
In an embodiment of the threading device for a sewing machine according to the present invention, the looper threading positioning part comprises a positioning pin which is driven by synchronization with the looper, contacts a disk with a notched part, and which is displaced in the axial direction when the locating pin is inserted into the notched portion of the disc in response to the secondary manual operation to move the control plate and to move the looper thread connecting conduit tube so that it is aligned with and contacts the looper hole entrance.
In one embodiment of the threading device for a sewing machine according to the present invention, a flow channel switching device is provided between the needle thread suction line tube and the looper thread connecting line tubes or between the suction opening and the discharge opening of the pump, which the flow channel at the time of needle threading in such a way switches so that the needle thread suction pipe is connected to the suction port and the looper thread connecting pipe is connected to an atmospheric port, and which switches the flow channel at the time of looper threading so that the discharge port is connected to the looper thread connecting pipe and the suction port is connected to an atmospheric port.
In an embodiment of the threading device for a sewing machine according to the present invention, the flow passage switching means comprises a flow passage switching valve which switches in connection with the primary manual operationbetween the state in which one of the suction port and the discharge port is connected to one of the needle thread suction pipe and the looper thread connecting pipe and the other of the suction port and the discharge port is connected to an atmospheric port, andthe state in which the other of the suction port and the discharge port is connected to the other of the needle thread suction pipe and the looper thread connecting pipe, and one of the suction port and the discharge port is connected to an atmospheric port.
In one embodiment of the present invention, the threading device is a pneumatic threading device for a sewing machine, which includes a stitch forming device with a sewing machine needle and a loop grasping device that forms intertwined stitches by entangling a needle thread threaded into a needle eye by interacting with the needle, wherein the threading device carries out the threading into the eye of the needle pneumatically. In such a threading device the following is provided: a hermetic lip which can be brought into hermetic contact with a semicircular edge part of the needle, the edge part including a thread exit of the needle eye, and wherein the hermetic lip has a corresponding semicircular edge part which includes a suction mouth opening sucking from the eye of the needle, a needle thread suction pipe connected to the suction mouth of the hermetic lip, a position switching mechanism that causes the hermetic lip to contact the needle at the time of needle threading so that the suction mouth is aligned with the thread exit of the eye of the needle and moves to a standby position by withdrawing the hermetic lip from the needle at the time of stitch formation, a pump, wherein the needle thread suction tube is connected to a suction port, and wherein the pump is the needle threading in d The eye of the needle passes through an end of the needle thread inserted into a thread entrance of the eye of the needle at the time of threading the needle through the suction mouth from the thread exit of the eye of the needle through the needle thread suction pipe to the suction port, a stitch forming device that forms chain stitches by the needle thread and the looper thread, which are threaded into the needle eye or looper hole, intertwined by interacting with the looper as a loop gripping device, a looper thread insertion inlet to which an ejection opening of the pump is connected, a looper thread guide pipe that is connected to the Looper thread insertion input is connected and conveys one end of the looper thread, which is introduced by compressed air from the ejection opening into the looper thread insertion input, a looper thread connecting conduit tube, which at the time of looper threading in a nested state in the looper thread guide lei is inserted and touches the looper hole entrance, and a conduit connecting mechanism which, at the time of looper threading, causes the looper thread connecting conduit tube to contact the looper hole entrance and the looper threading of an end of the looper thread inserted into the looper thread insertion entrance through the looper thread connecting Line pipe leads through the looper thread guide line pipe starting from the looper thread insertion entrance into the looper hole, and which separates the looper thread connecting line pipe from the looper hole entrance at the time of stitch formation.
EFFECT OF THE INVENTION
In the threading device for a sewing machine according to the present invention, the needle thread can be threaded pneumatically in suction form, with the sewing machine needle being sucked in only starting from the needle eye by a gas feed to a needle of a sewing machine such as a lockstitch sewing machine, an overcasting machine, a double chain stitch sewing machine or a deck stitch sewing machine.
In addition, in the threading device for a sewing machine according to the present invention, the needle thread can be pneumatically threaded in suction form, it being possible to suck only from the needle eye of the sewing machine needle by using the gas conveyance to the sewing machine needle to lower the fluid resistance and to obtain sufficient suction power by the suction rate of the pump, which is driven by a sewing machine motor as it is often used.
In addition, in the threading device for a sewing machine according to the present invention, the pneumatic needle threading of the sewing machine for threading the needle thread can be performed in suction form, only starting from the needle eye of the sewing machine needle is sucked by using the gas feed to the sewing machine needle, and also the looper threading can be carried out pneumatically by ejection in the form of ejection to the looper hole of the sewing machine by using the gas conveyance.
In addition, in the threading device for a sewing machine according to the present invention, the pneumatic needle threading can be carried out in the form of suction from the eye of the needle, and the pneumatic hook threading can be carried out in the form of ejection to the looper hole of the sewing machine by the suction and for gas conveyance the output can be used by a single pump driven by the sewing machine motor.
BRIEF DESCRIPTION OF THE DRAWINGS
[0032] [Fig. 1] Overall perspective view of a double chain stitch (cover stitch) overlock sewing machine with 5 (five) needles and 8 (eight) threads, which includes the needle threading device for a sewing machine according to the present invention. [Fig. 2] A block diagram of the double chain stitch (cover stitch) overlock sewing machine with 5 (five) needles and 8 (eight) threads which incorporates the needle threading device for a sewing machine according to the present invention. [Fig. 3] Partially exploded perspective view of the needle threading device for a sewing machine according to the present invention. [Fig. 4 (a)] An enlarged perspective view showing the needle of the needle threading device for a sewing machine according to the present invention in the reverse direction against the sewing direction. [Fig. 4 (b)] A perspective view with the needle of the needle threading device for a sewing machine according to the present invention viewed in the sewing direction. [Fig. 4 (c)] An enlarged perspective view of a hermetic lip of the needle threading device for a sewing machine according to the present invention. [Fig. Fig. 4 (d)] Partly sectional perspective view of the needle and the hermetic lip of the needle threading device for a sewing machine according to the present invention. [Fig. 5 (a)] Front view showing the needle and the hermetic lip from the front at the time of the needle threading state when the hermetic lip contacts the needle. [Fig. 5 (b)] A sectional view taken along the arrow A-A of Fig. 5 (a). [Fig. 5 (c)] Sectional view taken along arrow B-B of Fig. 5 (a). [Fig. 5 (d)] Sectional view taken along the arrow C-C of Fig. 5 (a). [Fig. 6] Partially exploded perspective view showing a position switching mechanism of the needle threading device for a sewing machine according to the present invention. [Fig. 7] Partially exploded perspective view showing the position switching mechanism of the needle threading device for a sewing machine according to the present invention. [Fig. 8] Partly exploded perspective view showing the position switching mechanism of the needle threading device for a sewing machine according to the present invention including a looper threading positioning part. [Fig. 9 (a)] An external view of a separator of the needle threading device for a sewing machine according to the present invention. [Fig. 9 (b)] A sectional view taken along the arrow A-A of Fig. 9 (a). [Fig. Fig. 10 (a)] (A): An exploded perspective view of a flow passage selector of the needle threading device for a sewing machine according to the present invention; (B): perspective view of a selector valve of the flow channel selector. [Fig. Fig. 10 (b)] A longitudinal sectional view of the flow channel selector of the needle threading device for a sewing machine according to the present invention. [Fig. 11] An explanatory diagram of a pump and a looper threading device using the needle threading device for a sewing machine according to the present invention. [Fig. 12 (a)] A perspective view for explaining the flow channel switching means of the needle threading device for a sewing machine according to the present invention at the time of hook threading. [Fig. 12 (b)] A perspective view for explaining the flow channel switching means of the needle threading device for a sewing machine according to the present invention at the time of needle threading. [Fig. 13] A schematic explanatory view for explaining the needle threading device for a sewing machine according to the present invention.
MODE FOR CARRYING OUT THE INVENTION
The following are the preferred embodiments in which the pneumatic needle and looper threading device according to the present invention is applied to a double chain stitch (cover stitch) overlock sewing machine with 5 (five) needles and 8 (eight) threads , will be described in detail with reference to the drawings.
As shown in Fig. 1, the Doppelkettestich- (Deckstich) Überwendlings- (Overlock) sewing machine is formed from a bed, a post and an arm, with a lower shaft LS as a drive shaft and an upper shaft US in each case parallel and extend in the horizontal direction. The lower shaft LS is rotatably driven by a sewing machine motor M1. The upper shaft US is rotationally driven by being synchronized with the lower shaft LS through a pulley of the lower shaft LP, a drive belt TV and a pulley of the upper shaft UP. The rotation ratio of the lower shaft LS and the upper shaft US is 1: 1. A manually rotatable hand wheel HP is connected to the lower shaft LS at the time of stopping the sewing machine motor M1.
As shown in Figs. 1, 2 and 4 (a) to 4 (d), a stitch forming device 4 is provided on a head and on the bed of the arm. This stitch forming device 4 forms stitches by intertwining needle threads 3a, 3b, 3c, 3d, 3e and looper threads 3f, 3g, 3h, which are fed into needle eyes 1c, 1d of hemstitching needles 1 (1a, 1b), needle eyes 1h, 1i, 1j of Double chain stitch needles 1 (1e, 1f, 1g) or hook holes 2d, 2e, 2f are threaded by hooks 2 (2a, 2b, 2c) as a loop gripping device that interacts with these needles.
The stitch forming device 4 has a needle bar push rod unit base 12a comprising a needle bar 10 and a push rod 11, the needle bar 10 being driven by a needle bar drive mechanism 12c to be vertically movable from the upper shaft US. The hemstitch needles 1 (1a, 1b) and the double chainstitch needles 1 (1e, 1f, 1g) are attached to the needle bar 10 by a needle holder 12b. In addition, the stitch forming device 4 includes a feed mechanism 15 which, when sewing, sandwiches a fabric WP to be sewn between a needle plate 13 and a presser foot 14 which is pressed by the push rod 11 and which performs the feed for each stitch. The feed mechanism 15 is driven together with a gripper drive mechanism for the grippers 2 (2a, 2b, 2c) through the lower shaft LS.
As for this Doppelkettestich- (cover stitch) -Überwendlings- (overlock) sewing machine with 5 (five) needles and 8 (eight) threads with the stitch forming device 4, the stitch formation takes place in the hemstitch (in the overlock stitch) on the sewing by crossing: the needle threads 3a, 3b inserted into the needle eyes 1e, 1d of the hemstitch needles 1 (1a, 1b) moving vertically and penetrating the needle plate 13, the lower looper thread 3f inserted into the Looper hole 2d of the lower looper 2a is inserted, the lower looper 2a reciprocating, following an arcuate path to cross the path of the hemstitch needles 1 (1a, 1b) on the underside of the throat plate 13, and the upper looper thread 3g, which is inserted into the looper hole 2e of the upper looper 2b, the upper looper 2b reciprocating, following an elliptical path to follow the path of the lower looper 2a on the lateral side of the stitch Cross bar 13 and to cross the path of the hemstitch needles 1 (1a, 1b) on the top of the throat plate 13.
The stitch formation in the double chain stitch (cover stitch) on the fabric to be sewn is done by crossing the following: the needle threads 3c, 3d, 3e, which are inserted into the needle eyes 1h, 1i, 1j of the double chainstitch needles 1 (1e, 1f, 1g) and the double chain stitch thread 3h inserted into the looper hole 2f of the double chain stitch looper 2c, the double chain stitch looper 2c reciprocating following an elliptical path to cross the path of the double chain stitch needles 1 (1e, 1f, 1g).
Incidentally, since the specific structure and operation of the above-mentioned stitch forming device 4 are publicly known or well known, a detailed explanation is omitted.
As shown in Figs. 1, 2 and 4 (a) to 4 (d), the double chain stitch (deek stitch) overlock sewing machine comprises the stitch forming device 4 which the hemstitch needles 1 (1a, 1b) and the double chainstitch needles 1 (1e, 1f, 1g), and the looper 2 (2a, 2b, 2c) which is the loop gripper that forms stitches by inserting the stitches into the needle eye 1c , 1d, 1h, 1i, 1j of the needles threaded needle threads 3a, 3b, 3c, 3d, 3e and the looper threads 3f, 3g, 3h intertwined by interacting with these needles.
As shown in Fig. 1, Fig. 4 (a) to Fig. 4 (d) and Fig. 5 (a) to Fig. 5 (d), the double chain stitch (cover stitch) overlock (overlock) Sewing machine according to a feature of the present invention has a pneumatic threading device 20 which carries out a pneumatic threading into the needle eyes 1c, 1d, 1h, 1i, 1j of the needles.
The pneumatic threading device 20 has a hermetic lip 7 (7a, 7b, 7c, 7d, 7e), which comes hermetically into contact with a peripheral band-ring-shaped area 22 of the needle, which the thread outlet 5 (5a, 5b, 5c, 5d, 5e) surrounds each needle eye 1c, 1d, 1h, 1i, 1j of the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g), and wherein the hermetic lip 7 (7a, 7b, 7c, 7d , 7e) has a corresponding peripheral band ring-shaped block 24 which surrounds the suction mouth opening 6 (6a, 6b, 6c, 6d, 6e) which, starting from the thread outlet 5 (5a, 5b, 5c, 5d, 5e) of the needle eye 1c, 1d, 1h, 1i, 1j of the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g) sucks.
A needle shaft ST of the hemstitch needle 1 (1a, 1b) and the double chain stitch needle 1 (1e, 1f, 1g) has a concave portion 1k (Fig. 4 (a), Fig. 4 (d)) to a loop catcher point of the gripper 2 (2a, 2b, 2c), which is the loop gripping device, to pass an upper part of each needle eye 1c, 1d, 1h, 1i, 1j. As shown in Fig. 4 (a), Fig. 4 (d), Fig. 5 (a) to Fig. 5 (c), the peripheral band ring-shaped area 22 of the hemstitch needle 1 (1a, 1b) and the double chain stitch needle 1 (1e, 1f, 1g) comprises: an upper band area part with a flat shape 9a which intersects the approximately central part of the concave part 1k and extends horizontally, a lower semicircular band area part 9b which the lower part of each needle eye 1c, 1d, 1h, 1i, 1j intersects and extends horizontally in the needle shaft ST, and two side band area parts 9c and 9d which connect the upper band area part with flat shape 9a and the lower semicircular band area part 9b and extend vertically and in the circumferential direction.
As shown in Figs. 4 (c), 4 (d), 5 (a) to 5 (d), the peripheral band ring-shaped block 24 of the hermetic lip 7 (7a, 7b, 7c , 7d, 7e) accordingly have the following: an upper belt segment with flat shape 9e, which extends horizontally, a lower semicircular belt segment 9f, which extends horizontally, and two side belt segments 9g and 9h, which form the upper belt segment with flat shape 9e and connect the lower semicircular band segment 9f to one another and extend vertically and in the circumferential direction.
When the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) contacts the hemstitch needle 1 (1a, 1b) and the double chain stitch needle 1 (1e, 1f, 1g), it occurs in an upper part of the peripheral band ring-shaped area 22 and the peripheral band ring-shaped block 24 to a close contact between the upper band area part or edge part segment of flat shape 9a of the peripheral band ring-shaped area 22 and the upper band segment of flat shape 9e extending horizontally and in a lower part of the peripheral band ring-shaped area 22 and of the peripheral band ring-shaped block 24, there is close contact between a lower convex semicircular band area part or edge part segment 9b of the peripheral band ring-shaped area 22 and the lower semicircular band segment 9f of the peripheral band ring-shaped block 24, in both lateral parts of the peripheral band ring-shaped area 22 and the peripheral band ring-shaped blocks 24, two laterally he band area parts 9c and 9d of the peripheral band ring-shaped portion 22 come into close contact with two side band segments 9g and 9h of the peripheral band ring-shaped block 24, respectively. When the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) touches the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g), the peripheral band ring-shaped area 22 of the hemstitch needle 1 (1a , 1b) and the double chain stitch needle 1 (1e, 1f, 1g) in close contact with the peripheral band ring-shaped block 24 of the hermetic lip 7 (7a, 7b, 7c, 7d, 7e). When the needle threading is carried out pneumatically, the threading of the needle thread can therefore be carried out safely and stably, since a suction effect is only possible starting from the needle eye of the sewing machine.
With each hermetic lip 7 (7a, 7b, 7c, 7d, 7e), spreading wings 9j, 9k protrude outward in a spread-out form in order to allow simple insertion of the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g) into the hermetic lip 7 (7a, 7b, 7c, 7d, 7e).
As shown in Fig. 1, Fig. 3, Fig. 11, Fig. 13, the suction mouth opening 6 (6a, 6b, 6c, 6d, 6e) of the hermetic lip 7 (7a, 7b , 7c, 7d, 7e) connected to a below-mentioned pump PU through an individual needle thread suction pipe 40a-40e and a grouped needle thread suction pipe 41a-41b.
As shown in Fig. 6 to Fig. 8, the pneumatic threading device 20 has a position switching mechanism 26 which the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) by touching the hemstitch needle 1 (1a, 1b) and brings the double chainstitch needle 1 (1e, 1f, 1g) into a threading position so that the suction mouth opening 6 (6a, 6b, 6c, 6d, 6e) at the time of needle threading onto each thread outlet 5 (5a, 5b, 5c, 5d, 5e) each needle eye 1c, 1d, 1h, 1i, 1j of the hemstitch needle 1 (1a, 1b) and the double chain stitch needle 1 (1e, 1f, 1g) is aligned, and which the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) in a ready position by withdrawing them from the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g) at the time of stitch formation.
The pneumatic threading device 20 has a pump PU which is connected to a suction opening 28a through the individual needle thread suction line tube 40a-40e and the grouped needle thread suction line tube 41a-41b and which the needle threading into the needle eye 1c, 1d, 1h , 1i, 1j of the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g) by pulling one end of the needle thread 3a, 3b, 3c, 3d, 3e into each thread entry 5f of each needle eye 1c, 1d, 1h, 1i, 1j of the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g) is inserted via the suction mouth opening 6 (6a, 6b, 6c, 6d, 6e) of each thread outlet 5 of the needle eye the hemstitch needle 1 (1a, 1b) and the double chain stitch needle 1 (1e, 1f, 1g) sucks through the individual needle thread suction pipe 40a-40e and the grouped needle thread suction pipe 41a to 41b at the time of needle threading to the suction port 28a.
As shown in Fig. 6 to Fig. 8, in the threading device 20 for a sewing machine according to the present invention, the position switching mechanism 26 has an operation part 30 which is connected to a sewing machine head and forms a preparatory position by primary manual operation becomes a preparatory state for needle threading, and which holds the preparatory position, wherein the position switching mechanism 26 also includes a lip positioning part 32 which is moved with the operating part 30 and, from the preparatory position, forms a threading position which becomes a needle threading state of needle threading, namely at a predetermined Nadeleinfädelungszeit, which depends on a manual rotary actuation, ie on a secondary manual actuation of the handwheel HP (Fig. 1, Fig. 2), the one on the lower shaft LS, which is the drive shaft , is attached.
In the threading device 20 for a sewing machine according to the present invention, the operating part 30 has a manually operated manual operating lever 69 and a transmission part 38 which is connected to the manual operating lever 69 and the preparation position by a stopper 80 and a hook part 74d of the lip Positioning part 32 holds. The lip positioning part 32 has a control part 90 which can be moved by the transmission part 38 and is elastically pushed back by a lip drive spring 86. The lip positioning part 32 forms the threading position which becomes the needle threading state of needle threading at a predetermined needle threading time depending on the secondary manual operation of the handwheel HP, and moves the hermetic lip 7 (7a, 7b, 7c, 7d, 7e ), which is attached in such a way that the suction mouth opening 6 (6a, 6b, 6c, 6d, 6e) is aligned with the thread outlet 5 (5a, 5b, 5c, 5d, 5e) of the eye of the needle 1c, 1d, 1h, 1i, 1j and touches the needle.
In the threading device for a sewing machine according to the present invention, the lip positioning portion 32 has a control pin 45 and a positioning pin 99 which pierces a control plate 50 that regulates movement of the control pin 45, the positioning pin being a washer 42 with a notched part 42b, which is driven by being synchronized with the needles, and the positioning pin is axially displaced in response to the manual rotary operation of the handwheel HP, that is, as a function of the secondary manual operation when it enters the notched Part 42b is inserted, wherein it pivots the control plate 50 and moves the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) through the control part 90 such that the suction mouth opening 6 (6a, 6b, 6c, 6d, 6e) the thread outlet 5 (5a, 5b, 5c, 5d, 5e) of the eye of the needle 1c, 1d, 1h, 1i, 1j of the hemstitch needle 1 (ta, 1b) and the double chainstitch needle 1 (1e, 1f, 19) is aligned and touches the needle.
The structure of the threading device 20 for a sewing machine assembled in this way will now be described in more detail. As shown in FIGS. 6 to 8, in the position switching mechanism 26 of the threading device 20 of the sewing machine, a threading setting lever shaft 72 is mounted in a fastening hole for the threading setting lever shaft 71b of a threading setting lever plate 71 which is secured by screws 79a, 79b and a pipe 79c is attached to the needle bar push bar unit base 12a of a sewing machine arm head, and wherein the threading setting lever shaft 72 in the transmission part 38 is mounted in a sliding hole for the threading setting lever shaft 74b and slides therein. The manual operating lever 69 for the primary manual operation is fastened by means of set screws 76 through a cover for a threading setting lever arm 75 from a long groove 69c via a slot 71j in the threading setting lever plate 71 to a fastening part 74c of the transmission part 38. The manual operating lever 69 slides on a manual lever sliding surface 71c. In the normal state of the transmission part 38 and the control part 90, one of the lip drive springs 86 is attached to a spring mounting arm 74a via a spacer 87 and a screw 88, and the other lip drive spring 86 is connected to a block 74e and a block 90b through a spacer 89a and a screw 89b tied together.
The stopper 80 is attached to the threading setting lever plate 71 through a stopper shaft 82, a washer 85, and a set screw 84 while being elastically urged clockwise by a stopper spring 83. A stopper release shaft 81 is provided on the stopper 80 protruding from a through hole for the stopper release shaft 71d of the threading setting lever plate 71. A lower incline cam 69a, an upper incline cam 69b, and a straight cam 69e connecting the two cams and on which the stopper release shaft 81 slides are provided on the manual operating lever 69. In the normal state, the stopper 80 is elastically urged in the clockwise direction by the stopper spring 83, and the stopper release shaft 81 is located under the lower tilt cam 69a in the manual operating lever 69. When the manual operating lever 69 slides on the threading adjustment lever shaft 72 with the transmission member 38 in the primary manual operation and is pushed down, the stopper release shaft 81 slides from the lower incline cam 69a on the straight cam 69e and rotates the stopper 80 counterclockwise, and it further slides on the upper incline cam 69b and rotates the stopper 80 clockwise, the hook part 74d of the transmission part 38 is locked to a hook part 80a of the stopper 80. This state is the aforementioned preparation position of the hermetic lip 7 (7a, 7b, 7c, 7d, 7e).
The lip drive spring 86 is suspended between the fastening part 74c, the spacer 87 of the screw 88 of the transmission part 38 and a fastening hole 90f, a screw 86a and a spacer 86b of the control part 90. A lip drive arm 100 is pivotably attached to the control part 90 via a pin 98 penetrating through a pivot hole 100a and connected to a mounting hole 90d. A lip drive guide shaft 93 connected to mounting holes for the lip drive guide shaft 91f, 91g of a lip guide plate 91 is pivotable is held in an attachment hole for the lip drive guide shaft 90a of the control member 90, and the lip guide plate 91 is attached to a lip guide plate attachment surface 71a. The lip drive arm 100 is slidably inserted into a cam 91a of the lip guide plate 91 by a positioning pin 99 pivotally mounted in a pin hole 100b. Since the lip drive arm 100 must be disposed adjacent to a left side in the lateral direction of the push rod 11 of the stitch forming device 4, a deformation cam 91b following the cam 91a on which the lip drive arm 100 slides moves the lip drive arm 100 through the positioning pin 99 to the right in lateral direction when the manual operating lever 69 moves downward in the primary manual operation, and the suction mouth opening 6 (6a, 6b, 6c, 6d, 6e) of the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) becomes at the time the needle threading is aligned with each thread outlet 5 (5a, 5b, 5c, 5d, 5e) of each needle eye 1c, 1d, 1h, 1i, 1j of the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 19). On the other hand, the lip driving arm 100 is connected to the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) through a lip guide arm 103, a lip holder shaft 117 and a lip holder 110.
On the other hand, a receiving part 77 rotatably supported by a receiving set screw 78 on the cover for the threading setting lever arm 75 is inserted into a threading lever connecting groove 52b of a tilt cam operating arm plate 52 in the lip positioning part 32. In addition, a tip of the female set screw 78 is inserted into an elongated groove 69d of the manual operating lever 69 and exits through it. The tilt cam operating arm plate 52 is resiliently urged upward by a lip return spring 89 suspended between a spring pin 71e of the threading setting lever plate 71 and an attachment hole 52c of the tilt cam operating arm plate 52, the screw 89b and the spacer 89a, and rotates by the Lower the manual control lever 69 clockwise. A flow passage switching valve 53 (FIGS. 8, 12 (a), 12 (b), 13) of a flow passage switching device 150 having a suction and discharge release shaft pin 54 and extending horizontally is by means of a Screw 56 is fixed to the incline cam operating arm plate 52 through a connection hole for the suction and discharge release shaft 55b of a tilt cam body 55 and a cam body attachment hole 52a.
A lip driving pin 96 provided on the control part 90 is inserted into a lip driving pin connecting groove 50b of the control plate 50 in the lip positioning part 32. The flow channel switching valve 53 is connected to a through hole for the suction and discharge release shaft 60a of a flow channel control main body 60 through a valve through hole 44b of a flow channel control main body 44, a valve through hole 50a of the control plate 50, and a needle threading fixing plate 41.
As for the above-mentioned control pin 45 having a large diameter part for the preparation position 45b and a small diameter part for the threading position 45c, on the one hand, a tip of a cam follower connecting shaft 46 contacts a tilt cam 55a via an operating spring 47 of the tilt cam body 55, and on the other hand, a pin end 45a contacts an end face 42a of the disc 42 with the notched portion 42b through a control pin through hole 44a of the flow channel control main body 44, a large-diameter pin insertion hole 50c of the control plate 50, a spring 49, the The needle threading fixing plate 41 and a control pin through hole 60b of the flow channel control main body 60. The disc 42, having the notched portion 42b, rotates in synchronism with the lower shaft LS which is the drive shaft. In addition, the operating spring 47 is attached between a receiving hole 45e of the control pin 45 and one end of the cam follower connecting shaft 46, and slipping is prevented by a pin 48 inserted into an elongated hole 45d.
As shown in Fig. 1, Fig. 11, Fig. 13, the pump PU in an illustrated embodiment is of the reciprocating type and is driven by a pump motor M2. The pump PU has a discharge port 28b and a discharge valve 135b and a suction port 28a and a suction valve 135a. The pump motor M2 rotates an eccentric cam 135c through a belt V and a pulley PP, this rotational movement causing a piston 135f of the pump PU to reciprocate linearly, the movement conversion being carried out by a drive rod 135d and a swivel link 135e. The pump PU can also be of the rotary type.
In one embodiment of the threading device 20 for a sewing machine, the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) is made of a material selected from flexible rubbers, plastics and corks. In a further embodiment of the threading device of the sewing machine, the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) is also made of a material selected from flexible or elastic rubbers, plastics and corks which do not impair flexibility. In general, depending on the properties and thickness of the thread and / or the properties and thickness of the fabric, the needle may be replaced by a needle of a different thickness. On the other hand, it is prescribed that the distance t (Fig. 5 (b)) of the side surface of the concave part 1k of the needle, which the looper 2 passes as a loop gripper, to the center of the needle is constant. Since the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) is made of a material selected from flexible rubbers, plastics and corks, or is made of a material selected from flexible or elastic rubbers, plastics and corks which does not affect the flexibility, when changing to a needle with a different thickness, the adhesion of the peripheral band-shaped area 22 of the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g) to the peripheral band-shaped block 24 of the hermetic Lip 7 (7a, 7b, 7c, 7d, 7e) are guaranteed.
As shown in Figs. 9 (a) to 9 (b) and Fig. 13, a separator main body 115 is inserted into the aforementioned lip retainer 110 and fixed by a screw 115a. In the threading device 20 of the sewing machine according to the present invention, the following are provided between the needle thread suction pipe 40a-40e and the pump PU: a separating device 120 having a thread stop wall 116 against which the needle thread 3a (3b, 3c, 3d, 3e) which is brought about by the suction from the needle thread suction pipe 40a-40e, and a space 115g which prevents the flow speed of the air impinging on the thread stopping wall 116 from being less than the speed of the flow caused by the suction Pump PU is conveyed, and that the needle thread 3a (3b, 3c, 3d, 3e), which is stopped by the impact on the thread stop wall 116, is sucked towards the pump PU.
That is, in the separator main body 115, a space 115h communicates with flow passages 115i, 115j and is connected to the suction port 28a of the pump PU. Due to the flow speed of the air bouncing against the thread stop wall 116, the needle thread 3a (3b, 3c, 3d, 3e), which is carried by the suction and has a large inertial force, becomes slower than the speed of the flow which is caused by the suction is conveyed to the pump PU. In other words, the needle thread 3a (3b, 3c, 3d, 3e) collides with the thread stopping wall 116 of the partitioned space 115g and is stopped and left, thereby separating the needle thread and the air. On the other hand, in the space 115h, the air suddenly rotates with low inertial force in the direction of the flow channel connected to the pump PU, and the space 115h becomes the flow channel for the sucked air which flows from the flow channels 115i, 115j via the needle thread. Suction pipe 41a (41b) is sucked in by the pump PU.
One hermetic lip 7 (7a, 7b, 7c, 7d, 7e) is provided for each hemstitch needle 1 (1a, 1b) and double chainstitch needle 1 (1e, 1f, 1g), and similarly one for each Separating device 120 is provided for each hemstitch needle 1 (1a, 1b) and double chainstitch needle 1 (1e, 1f, 1g).
As shown in Fig. 8, Fig. 10 (a) to Fig. 10 (b) and Fig. 13, the needle in the threading device 20 of the sewing machine according to the present invention is composed of a plurality of hemstitching needles 1 (1a, 1b ) and double chainstitch needles 1 (1e, 1f, 1g), dividing these plural needles into at least two groups to reduce the size and capacity of the pump PU. Expressed differently, these multiple needles are divided into the hemstitch needles 1 (1a, 1b) and the double chainstitch needles 1 (1e, 1f, 1g), a flow channel selection device 33 being provided, which each contain the hemstitch needles 1 (1a, 1b) and double chainstitch needles 1 (1e, 1f, 1g) selects the two groups and connects them to the suction port 28a of the pump PU.
That is, a flow passage selection pipe 64 having a suction discharge hole 64a and extending vertically is built into the flow passage control main body 44 of the flow passage selector 33 with its central part having a hemstitch needle suction inlet hole 64b and a double chainstitch needle suction inlet hole 64c that are out of phase by an angle of 90 degrees. Accordingly, the flow channel control main body 44 has a suction exit hole 43a, a hemstitch needle suction hole 43b, and a double chainstitch needle suction hole 43c. The suction outlet hole 43a is connected to the pump PU. The hemstitch needle suction inlet hole 64b and the double chainstitch needle suction inlet hole 64c are connected to the hemstitch needle suction inlet hole 43b and the double chainstitch needle suction inlet hole 43c, respectively. In the flow channel selector 33, a flow channel selection lever 132 for selecting the flow channel for either the hemstitch needle suction inlet hole 64b and the hemstitch needle suction inlet hole 43b or the double chain stitch needle suction inlet hole 64c and the double chain stitch needle suction inlet hole 43c is a base hole 43c of the flow pin 131a Selector lever 131 held pivotably between two stoppers 131b and - starting from a flow channel selection arm 132a of flow channel selection lever 132 - connected to a flow channel selection arm 65 of flow channel selection tube 64 by a connection piece for flow channel selection 61. The flow channel is selected by converting the pivoting movement by the flow channel selection arm 132a of the flow channel selection lever 132 via the connecting piece 61 into a pivoting movement by the flow channel selection arm 65 and by changing to a rotary movement of the flow channel selection tube 64.
As mentioned above, in the threading device 20 for a sewing machine according to the present invention, this sewing machine has a stitch forming device 4 which forms the stitches by drawing the needle thread 3a, 3b, 3c, 3d, 3e and the looper thread 3f, 3g , 3h, which are threaded into the eye of the needle 1c, 1d, 1h, 1i, 1j or the looper hole 2d, 2e, 2f, are intertwined by interacting with the looper 2 (2a, 2b, 2c) as a loop gripping device.
As shown in Figs. 1 to 2 and Figs. 11, 13, the threading device 20 for a sewing machine comprises: a looper thread insertion entrance 35 to which the discharge port 28b of the pump is connected, a looper thread guide -Line pipe 37 which is connected to the looper thread insertion entrance and which conveys one end of the looper thread 3f, 3g, 3h, which is inserted into the looper thread insertion entrance 35 by the compressed air from the discharge port 28b, a looper thread connection line pipe 39 which is connected to the Time of the looper threading is inserted in the nested state into the looper thread guide line pipe 37 and touches a looper hole entrance 2g, 2h, 2i of the looper 2 (2a, 2b, 2c), and a line pipe connecting mechanism 140, which causes the Looper thread connecting pipe 39 touches the looper hole entrance 2g, 2h, 2i and the looper threading of one end of the looper thread, which is in the looper thread insertion inlet 35 is inserted, through the looper thread connection pipe 39 via the looper thread guide pipe 37 starting from the looper thread insertion inlet 35 into the looper hole 2d, 2e, 2f, and which at the time of stitch formation the looper thread connection pipe 39 from the looper hole inlet 2g , 2h, 2i separates. This mechanism is disclosed per se in JP4741701B = US8925472B.
In an embodiment of the threading device for a sewing machine according to the present invention, the conduit connection mechanism 140 comprises: an operating part 141 which is fixed to the sewing machine bed and which is operated by the manual operation of a looper threading lever 136, that is, by the primary manual operation which Forms preparatory position which becomes the preparatory state for needle threading, and which holds the preparatory position, and a looper threading positioning part 142, which starts at a predetermined looper threading time, depending on the manual rotary operation of the handwheel HP, ie depending on the secondary manual operation forms a looper threading position from the preparation position, which becomes the looper threading state of looper threading.
In an embodiment of the threading device for a sewing machine according to the present invention, the looper threading positioning part 142 has a positioning pin 147. The positioning pin 147 is driven by synchronization with the gripper and contacts a disk 143 which has a notched portion 144. The positioning pin 147 is displaced in the axial direction when it is inserted into the notched part in response to the manual rotary operation of the handwheel HP, that is, in response to the secondary manual operation, with a holding plate 145 for the looper thread connecting pipe 39 in the pipe -Linking mechanism 140 is moved by a spring 146 so that the looper thread connecting conduit tube 39 is aligned with and contacts the looper hole entrance 2g, 2h, 2i.
As shown in Fig. 2, Fig. 8, Fig. 12 (a), Fig. 12 (b) and Fig. 13, in the threading device 20 for a sewing machine according to the present invention between the flow passage for sucking the Needle thread 44d and the looper thread connecting pipe 39, or between the suction opening 28a and the discharge opening 28b of the pump, the flow channel switching device 150 is provided, which switches at the time of needle threading so that a flow channel for sucking the needle thread 44d with the suction opening 28a and the looper thread connecting pipe 39 is connected to an atmospheric port 60d, and at the time of looper threading, switches so that the discharge port 28b is connected to the looper thread connecting pipe 39 and the suction port 28a is connected to an atmospheric port 44c.
In the threading device 20 for a sewing machine according to the present invention, the flow channel switching device 150 is locked with the operation of the manual operating lever 69, that is, the primary manual operation, and in the flow channel switching valve 53, the flow channel control main bodies 44, 60 have the atmosphere opening (suction release hole) 44c and the suction release hole 60c. The flow passage switching valve 53 is inserted into a shaft guide tube 60g from the through hole for the suction and discharge release shaft 60a, with the atmosphere opening (suction release hole) 44c and the suction release hole 60c located at the same position. The flow passage switching valve 53 has suction and discharge release holes 53a, 53b and is connected to the atmosphere ports 44c, 60d in accordance with the rotation. The suction and discharge release holes 53a, 53b are axially spaced from each other and are arranged with a displacement of 90 degrees in the direction of rotation, depending on the rotation of the tilt cam body 55 by the lowering of the manual lever 69 of the position switching mechanism 26 and thus depending on upon rotation of the flow channel switching valve 53 by 90 degrees communicate with the atmosphere ports 44c, 60d of the flow channel control main body 44, respectively.
As shown in Fig. 2, the threading device 20 for a sewing machine according to the present invention is controlled by a control device (CPU). That is, a needle threading button 133, a looper threading button 152, a foot controller 153 and a power switch 154 are connected to the control device (CPU). The sewing machine motor M1 and the pump motor M2 are driven and controlled by the controller (CPU).
Regarding the above embodiment, the following should be noted: Although a sewing machine has been described in which the hemstitch needle 1 (1a, 1b) and the double chain stitch needle 1 (1e, 1f, 1g) and the looper 2 (2a, 2b, 2c) as For example, if the loop grasping device is used, the present invention is also applicable to a sewing machine in which the needle and the hook are used as the loop grasping device.
In the thus assembled threading device 20 for a sewing machine according to the present invention, the operation and manipulation are carried out in the manner described below.
Further, when the sewing machine of the present invention is not being operated by the sewing machine motor M1 and when the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) is in the retracted position, the position switching mechanism 26 of the threading device 20 occurs of the sewing machine, when the manual operating lever 69 slides and moves downward in the primary manual operation of the operating part 30 with the transmission part 38 on the threading setting lever shaft 72, the stopper releasing shaft 81 slides from the lower inclination cam 69a on the straight cam 69e and rotates the stopper 80 counterclockwise, after which it continues to slide on the upper tilt cam 69b and rotates the stopper 80 clockwise. The hook part 74d of the transmission part 38 is locked to a hook part 80a of the stopper 80 (FIG. 6). This state is the preparation position of the hermetic lip 7 (7a, 7b, 7c, 7d, 7e).
By lowering the manual operating lever 69, the receiving part 77 rotatably supported by the receiving set screw 78 on the cover for the threading setting lever arm 75 simultaneously rotates the threading lever connection groove 52b of the tilt cam operating arm plate 52 in the lip positioning part 32 clockwise (Fig. 8). Since the incline cam body 55 rotates, the flow passage switching valve 53 also rotates 90 degrees. In this way, the flow passage for sucking the needle thread 44d is connected to the suction port 28a through the flow passage switching valve 53 of the flow passage switching device 150, the looper thread connecting pipe 39 is connected to the atmosphere port 60d, and the switching is performed, whereby the needle threading state of the Hemstitch needle 1 (1a, 1b) and double chainstitch needle 1 (1e, 1f, 1g) become possible (Fig. 8, Fig. 12 (b)). In other words, by lowering the manual operating lever 69, priority is given to needle threading compared to hook threading. The operation and actuation of the looper threading are explained below.
When the manual lever 69 is moved down, moreover, the lip drive pin 96 of the control member 90 rotates the control plate 50 clockwise in the lip drive pin connecting groove 50b of the control plate 50, and the aforementioned tilt cam body 55 rotates with one end of the control pin 45 through the operating spring 47 and the cam follower connecting shaft 46 contacts the tilt cam body 55, and the other end through a control pin through hole 44a of the flow channel control main body 44, the large diameter hole 50c of the control plate 50, the spring 49, the needle threading Fixing plate 41 and the control pin through hole 60b of the flow channel control main body 60 contact the disk 42 (FIGS. 7, 8).
When performing the rotary manual operation of the handwheel HP fixed to the lower shaft LS which is the drive shaft, that is, when performing the secondary manual operation, the control pin 45 is inserted into the notched portion 42b and displaced in the axial direction, and the small-diameter part of the control pin 45 for threading position 45c is inserted into an insertion hole for the small-diameter pin 50d, thereby pivoting the control plate 50 clockwise. As the control portion 90 descends, the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) connected thereto by the lip drive arm 100, lip guide arm 103, lip holder shaft 117 and lip holder 110 descends along cam 91a the lip guide plate 91 and the deformation cam 91b. In this way, in the lip positioning part 32, the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) moves to the threading position and contacts the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g) .
Before the actual threading, a group is selected by operating the flow channel selection lever 132 of the flow channel selection device 33, which is used to reduce the size and capacity of the pump PU. When the flow channel selection lever 132 shown in Fig. 10 (a) is pivoted to the right, it is connected to the flow channel selection pipe 64 through the connector 61, and the pivoting movement of the flow channel selection lever 132 becomes linear movement of the connector 61 and a rotational movement of the flow channel selection tube 64 is converted, the hemstitching needle suction inlet hole 64b is connected to the hemstitching needle suction inlet hole 43b, and the flow channel for the hemstitching needle 1 (1a, 1b) is selected (Fig. 10 (b)). When the flow channel selection lever 132 is pivoted to the left, the double chainstitch needle suction inlet hole 64c is connected to the double chainstitch needle suction inlet hole 43c, and the flow channel for the double chainstitch needle 1 (1e, 1f, 1g) is selected.
After this hermetic lip 7 (7a, 7b, 7c, 7d, 7e) has been in contact with the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g), and when the flow channel is switched and the selection of the flow channel has been made when the power switch 154 is turned on and the needle threading button 133 is pressed, since the control device (CPU) drives the threading pump PU through the pump motor M2, an operator brings one end of the needle thread 3a (3b, 3c, 3d, 3e) in the vicinity of the thread entry 5f in the eye of the needle 1c, 1d, 1h, 1i, 1j of the hemstitch needle 1 (1a, 1b) or the double chainstitch needle 1 (1e, 1f, 1g). When the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) touches the hemstitch needle 1 (1a, 1b) and the double chain stitch needle 1 (1e, 1f, 1g), it occurs in the upper part of the peripheral band ring-shaped area 22 and the peripheral band ring-shaped blocks 24 comes into close contact between the upper edge part segment 9a of flat shape of peripheral band ring-shaped portion 22 and the upper band segment of flat shape 9e extending horizontally and in the lower part of peripheral band ring-shaped portion 22 and peripheral band ring-shaped block 24 comes the lower convex semicircular edge part segment 9b of the peripheral band ring-shaped portion 22 and the lower semicircular band segment 9f of the peripheral band ring-shaped block 24 come into close contact, and in both side parts of the peripheral band ring-shaped area 22 and the peripheral band ring-shaped block 24, two side band area parts 9c come into being and 9d of the peripheral band ring-shaped Area 22 each in close contact with two lateral band segments 9g and 9h of the peripheral band ring-shaped block 24. When the hermetic lip 7 (7a, 7b, 7c, 7d, 7e) the hemstitch needle 1 (1a, 1b) and the double chainstitch needle 1 (1e, 1f, 1g), the peripheral band ring-shaped area 22 of the hemstitch needle 1 (1a, 1b) and the double chain stitch needle 1 (1e, 1f, 1g) come into close contact with the peripheral band ring-shaped block 24 of the hermetic lip 7 (7a, 7b, 7c, 7d, 7e). When the needle threading is carried out pneumatically, the threading of the needle thread can therefore be carried out safely and stably, since the suction is only possible starting from the needle eye of the sewing machine.
In this case, the needle thread 3a (3b, 3c, 3d, 3e), which is brought up by the suction from the needle thread suction pipe 40a-40e, collides against the thread stop wall 116 of the separating device 120 in the threading device 20, which is located between the needle thread -Suction pipe 40a-40e and the pump PU is provided, wherein in the space 115g the flow speed of the air impinging on the thread stop wall 116 is lower than the speed of the flow which is carried by the suction to the pump PU, and it becomes prevents the needle thread 3a (3b, 3c, 3d, 3e), which is stopped by the impact on the thread stop wall 116, from being sucked to the pump PU. Due to the flow speed of the air bouncing against the thread stop wall 116, the needle thread 3a (3b, 3c, 3d, 3e), which is carried by the suction and has a large inertial force, becomes slower than the speed of the flow which is caused by the suction is conveyed to the PU pump; in other words, the needle thread 3a (3b, 3c, 3d, 3e) collides with the thread stopping wall 116 of the partitioned space 115g and is stopped and left, thereby separating the needle thread and the air. On the other hand, in the space 115h, the air with low inertia suddenly rotates toward the flow passage connected to the pump PU, and the space 115h becomes the flow passage for the sucked air flowing from the suction port 28a through the flow passages 115i, 115j and the flow passage for sucking the needle thread 44d is sucked by the pump PU.
The hermetic lip 7 (7a, 7b, 7c, 7d, 7e), on the other hand, returns to a standby position when the manual operating lever 69 of the operating part 30 is raised. That is, the receiving part 77 rotatably supported by the receiving set screw 78 on the cover for the threading setting lever arm 75 rotates the threading lever connecting groove 52b of the tilt cam operating arm plate 52 in the lip positioning part 32 counterclockwise. Since the incline cam body 55 rotates, the flow passage switching valve 53 also rotates 90 degrees. In this way, the discharge port 28b is connected to the looper thread connecting pipe 39 through the flow channel switching valve 53 of the flow channel switching device 150 at the time of looper threading, the suction port 28a is connected to the atmospheric opening 44c, and the switching is performed, whereby the looper threading state of the Gripper 2 (2a, 2b, 2c) becomes possible (Fig. 8, Fig. 12 (a))
In performing the primary manual operation by the operating part 141 of the looper threading positioning part 142, in the state where the looper thread guide pipe 37 of the pipe connecting mechanism 140 is nested with the looper thread connecting pipe 39, the positioning pin 147 contacts the disk 143, and the preparatory position which becomes the preparatory state for needle threading is established and held. Then, in the looper threading positioning part 142, when the manual rotary operation of the handwheel HP is carried out, that is, when the secondary manual operation is carried out, the following occurs the positioning pin 147 in the axial direction, and the plate 145 slides, whereby at a predetermined looper threading time, starting from the preparation position, the looper threading position is established, which becomes the looper threading state of the looper threading, so that the looper thread connecting pipe 39 to the looper hole entrance 2g, 2h, 2i is aligned and in contact with the looper thread connecting pipe 39 is in contact with the looper hole entrance 2g, 2h, 2i, and the looper hole 2d, 2e, 2f is connected to the looper thread insertion entrance 35.
If the looper threading button 152 is now pressed, the following occurs, since the control device (CPU) drives the threading pump PU through the pump motor M2: When the operator places an end of the looper thread 3f, 3g, 3h in the looper thread insertion entrance 35 of a looper thread inserting mechanism 161, this looper thread is conveyed with the aid of air from the looper thread connecting pipe 39 of the pipe connecting mechanism 140 through the looper thread guide pipe 37 to the looper hole 2d, 2e, 2f. In this way, in the gripper 2 (2a, 2b, 2c), the gripper is threaded into the gripper hole 2d, 2e, 2f by means of compressed air starting from the discharge opening 28b of the pump PU.
Subsequently, when the reverse operation of the primary manual operation of the above-mentioned operating part 141 is performed at the time of stitch formation, it returns to the stitch formation state in which the looper thread connecting pipe 39 is separated from the looper hole entrance 2g, 2h, 2i.
After the completion of this looper threading, the following occurs: Since the control device (CPU) drives the needle bar drive mechanism 12c, the feed mechanism 15 and the looper drive mechanism 160 from the upper and lower shafts US, LS through the sewing machine motor M1, it comes through the Stepping on the foot control 153for stitch formation for the hemstitch (the overlock stitch) on the fabric WP to be sewn by crossing the following: the needle thread 3a, 3b, which is inserted into the needle eye 1c, 1d of the hemstitch needle 1 (1a, 1b), which is vertical moves, penetrating the throat plate 13, the lower looper thread 3f which is inserted into the looper hole 2d of the lower looper 2a which reciprocates following an arcuate path to follow the path of the hemstitch needle 1 (1a, 1b ) at the bottom of the throat plate 13, and the upper looper thread 3g inserted into the looper hole 2e of the upper looper 2b that reciprocates following an elliptical path around the path of the lower looper 2a to cross the lateral side of the throat plate 13 and to cross the path of the hemstitch needle 1 (1a, 1b) at the top of the throat plate 13, andthe stitch formation for the double chain stitch (cover stitch) is carried out on the fabric to be sewn by crossing the following: the needle thread 3c, 3d, 3e, which is inserted into the needle eye 1h, 1i, 1j of the double chainstitch needle 1 (1e, 1f, 1g), and the double chain stitch looper thread 3h inserted into the looper hole 2f of the double chain stitch looper 2c which reciprocates following an elliptical path to cross the path of the double chain stitch needle 1 (1e, 1f, 1g).
INDUSTRIAL APPLICABILITY
With only one pump driven by the sewing machine motor, the threading device for a sewing machine according to the present invention can be suitably applied to a sewing machine such as a lockstitch sewing machine, an overcasting sewing machine, a double chain stitch sewing machine or a cover stitch sewing machine that uses the Use suction and discharge to convey gas, pneumatically threading the needle starting from the needle eye of the sewing machine needle in suction form and threading the looper pneumatically in the form of an ejection to the looper hole.
EXPLANATION OF REFERENCE SIGNS
LS lower shaft US upper shaft LP pulley of the lower shaft TV drive belt UP pulley of the upper shaft HP handwheel M1 sewing machine motor M2 pump motor CPU control device WP fabric ST needle shaft PU pump V belt PP pulley t spacing 1, (1a, 1b) hemstitch needle 1c , 1d, 1h, 1i, 1j Eye of the needle 1 (1e, 1f, 1g) Double chainstitch needle 1k Concave part 2 (2a, 2b, 2c) Hook 2d, 2e, 2f Hook hole 2g, 2h, 2i Hook hole entrance 3a, 3b, 3c, 3d, 3e needle thread 3f, 3g, 3h looper thread 4 stitch forming device 5 (5a, 5b, 5c, 5d, 5e) thread outlet 5f thread inlet 6 (6a, 6b, 6c, 6d, 6e) suction mouth opening 7 (7a, 7b, 7c, 7d, 7e) Hermetic lip 9a upper band area part with flat shape / upper edge part segment with flat shape 9b lower semicircular band area part / lower semicircular edge part segment 9c, 9d lateral band area part 9e upper band segment with flat shape 9f lower semicircular band segment 9g, 9h side band segment 9j, 9k flights l 10 needle bar 11 push rod 12a needle bar push bar unit base 12b needle holder 12C needle bar drive mechanism 13 throat plate 14 presser foot 15 feed mechanism 20 pneumatic threading device 22 peripheral band ring-shaped portion 24 peripheral band ring-shaped block 26 position switching mechanism 28a suction port 28b discharge port 30 operating part 32 lip selection part 33 flow passage Looper thread insertion inlet 37 Looper thread guide line tube 38 Transfer part 39 Looper thread connecting line tube 40a-40e Needle thread suction line tube 41a, 41b Grouped needle thread suction line tube 41 Needle threading fastening plate 42 Washer 42a End face 42b Notched partial hole 43a Suction exit hole 43c - Suckle stitch needle Flow channel control main body 44a Control pin through hole 44b Valve through hole 44c Atmospheric opening 44d Flow channel for connection eyes of needle thread 45 control pin 45a pin end 45b large diameter part for preparation position 45c small diameter part for threading position 45d elongated hole 45e receiving hole 46 cam follower connecting shaft 47 operating spring 49 spring 48 pin 50 control plate 50a valve through hole 50b lip drive pin connecting groove 50c large diameter pin insertion hole 50d Small-diameter pin insertion hole 52 Inclination cam operating arm plate 52a Cam body mounting hole 52b Threading lever communication groove 52c Mounting hole 53 Flow passage switching valve 53a, 53b Suction and discharge releasing hole 54 Suction and discharge release shaft journals 55 Inclination cam bodies 55a Connection cams 55a Discharge release shaft 56 screw 60 flow passage control main body 60a through hole for suction and discharge release shaft 60b control pin through hole 60c suction release hole 60d atmosphere port 60g shaft guide Guide tube 61 Connection piece for flow channel selection 64 Flow channel selection tube 64a Suction outlet hole 64b Hemstitch needle suction inlet hole 64c Double chainstitch needle suction inlet hole 65 Flow channel selection arm 69 Manual operating lever 69a Lower inclination cam 69b Upper inclination cam 69c Long groove 69d Long groove hole 69e Straight cam guide 71 Lever plate insertion shaft 71c Hand lever sliding surface 71d through hole for the stopper release shaft 71e spring pin 71j slot 72 threading adjustment lever shaft 74a spring fixing arm 74b sliding hole for threading adjustment lever shaft 74c fixing part 74d hook part 74e block 75 cover for threading adjustment arm 76, adjustment screw 77b, lever 79ca 78 Stopper 80a Hook part 81 Stopper release shaft 82 Stopper shaft 83 Stopper spring 84 Set screw 85 Washer 86 Lip drive spring 87 A Spacer 88 Screw 89 Lip Return Spring 89a Spacer 89b Screw 90 Control Part 90a Fixing Hole for Lip Drive Guide Shaft 90b Block 90d Fixing Hole 90f Fixing Hole 91 Lip Guide Plate 91a Cam 91b Deforming Cam 91f, 91g Fixing Hole for Lip Drive Guide Shaft 93 Lip Drive Guide Shaft 96 Lip Drive Pin 98 Pin 99 Positioning Pin 100 lip drive arm 100a pivot hole 100b pin hole 103 lip guide arm 110 lip retainer 115 separator main body 115a screw 115b grouped suction port 115c grouped suction port 115g space 115h space 115i, 115j flow channel 116 thread stop wall 117 lip holder shaft 120 separator 131 base of flow channel selection lever 131a pivot pin 131b stopper. 132 flow channel selection lever. 132 flow channel selection lever 132a flow channel selection arm 133 needle threading button 135a suction valve 135b exhaust valve 135c eccentric cam 135d drive rod 135e pivot link 135f piston 13 6 Looper threading lever 140 Conduit connecting mechanism 141 Control part 142 Looper threading positioning part 143 Disc 144 Notched part 145 Retaining plate 146 Spring 147 Positioning pin 150 Flow channel switching device 152 Looper threading button 153 Foot control 154 Circuit breaker 160 Looper drive mechanism

权利要求:
Claims (12)
[1]
1. Pneumatic threading device (20) for a sewing machine with a stitch forming device (4) which contains a sewing machine needle (1a, 1b, 1e, 1f, 1g), and a loop gripping device which forms stitches by inserting a stitch into a needle eye (1c, The threading device ( 20) threading into the eye of the needle (1e, 1d, 1h, 1i, 1j) pneumatically, characterized in that the threading device (20) comprises the following:a hermetic lip (7) which can be brought into hermetic contact with a peripheral band-shaped area (22) of the needle (1a, 1b, 1e, 1f, 1g), the peripheral band-shaped area (22) being a thread exit of the needle eye (1e , 1d, 1h, 1i, 1j) and the hermetic lip (7) has a corresponding peripheral band-ring-shaped block (24) which surrounds a suction mouth opening (6) for suction from the thread outlet of the needle eye (1c, 1d, 1h, 1i, 1j) from,a needle thread suction pipe (40) connected to the suction mouth opening (6) of the hermetic lip (7),a position switching mechanism (26) with which the hermetic lip (7) can be moved into a threading position at the time of needle threading, so that the suction mouth opening (6) is aligned with the thread exit of the needle eye (1c, 1d, 1h, 1i, 1j) and comes into contact with the needle (1a, 1b, 1e, 1f, 1g), and with which the hermetic lip (7) can be moved into a standby position at the time of stitch formation by being removed from the needle (1a, 1b, 1e, 1f , 1g) is withdrawn, anda pump (PU), the needle thread suction pipe (40) being connected to a suction opening (28a) of the pump (PU) in such a way that the pump (PU) threading the needle into the needle eye (1c, 1d, 1h, 1i, 1j) by taking one end of the needle thread (3), which is inserted into a thread inlet (5f) of the needle eye (1c, 1d, 1h, 1i, 1j), at the time of threading the needle through the suction mouth opening (6) from the thread outlet ( 5) of the needle eye (1e, 1d, 1h, 1i, 1j) through the needle thread suction pipe (40a-40e) to the suction port (28a).
[2]
2. Pneumatic threading device (20) for a sewing machine according to claim 1, characterized in thatthe needle (1a, 1b, 1e, 1f, 1g) in an upper part of the needle eye (1c, 1d, 1h, 1i, 1j) has a concave part (1k) for passing a loop catcher point of the loop grasping device, and thatthe peripheral band-shaped area (22) of the needle (1a, 1b, 1e, 1f, 1g) has the following:an upper band area part with a flat shape (9a) which intersects a central part of the concave part (1k) and extends horizontally; a lower semicircular band area part (9b) which a lower part of the needle eye (1c, 1d, 1h, 1i, 1j ) intersects and extends horizontally, and two lateral band area parts (9c) which connect the upper band area part with a flat shape (9a) and the lower semicircular band area part (9b) and extend vertically and in the circumferential direction, and thatthe peripheral band ring-shaped block (24) of the hermetic lip (7) accordingly has the following:an upper flat-shaped belt segment (9e) that extends horizontally, a lower semicircular belt segment (9f) that extends horizontally, and two side belt segments (9g, 9h) that define the upper flat-shaped belt segment (9e) and the lower semicircular band segment (9f) connect with each other and extend vertically and in the circumferential direction.
[3]
3. Pneumatic threading device (20) for a sewing machine according to claim 1, characterized in thatthe hermetic lip (7) is formed from a material selected from flexible rubbers, plastics and cork.
[4]
4. Pneumatic threading device (20) for a sewing machine according to claim 3, characterized in thatthe hermetic lip (7) is formed from the one material which is elastic so that its flexibility is not impaired, and is selected from elastic rubbers, plastics and cork.
[5]
5. Pneumatic threading device (20) for a sewing machine according to claim 1, characterized in that the following is provided between the needle thread suction pipe (40) and the pump (PU):a separator (120) having a thread stop wall (116) against which the needle thread (3a-3e) impinged by the suction from the needle thread suction pipe (40), and a space (115g, 115h) which prevents that the flow speed of the air that hits the thread stop wall (116) is lower than the speed of the flow that is carried by the suction to the pump (PU), and that prevents the needle thread (3a-3e), the is stopped by the impact on the thread stop wall (116), is sucked to the pump (PU).
[6]
6. Pneumatic threading device (20) for a sewing machine according to claim 1, characterized in that the position switching mechanism (26) has the following:an operating part (30) by which the hermetic lip (7) can be positioned in a preparation position by a manual operation of a manual operating lever (69), and the operating part can be held in the preparation position, and a lip positioning part (32), which with the operating part (30) is movable in such a way that the hermetic lip, starting from the preparation position, can be positioned in a threading position as a function of manual actuation of the handwheel (HP) of the lip positioning part (32),wherebythe operating part (30) comprises: the manual operating lever (69) which is manually operable, and a transmission part (38) which is connected to the manual operating lever (69) and holds the hermetic lip in the preparation position by a hook, and thatthe lip positioning part (32) has a control part (90) movable by the transmission part (38) and elastically lowered by a lip drive spring (86), and the hermetic lip by the control part (90) in response to the manual operation of the handwheel (HP) of the lip positioning part (32) can be positioned in the threading position, and the hermetic lip (7) can be moved by the control part (90) in such a way that the suction mouth opening (6) on the thread outlet (5) of the needle eye ( 1c, 1d, 1h, 1i, 1j) is aligned and the hermetic lip (7) contacts the needle (1a, 1b, 1e, 1f, 1g).
[7]
7. Pneumatic threading device (20) for a sewing machine according to claim 6, characterized in that the lip positioning part (32) further comprises:a control pin (45) and a control plate (50) which limits movement of the control pin (45), the control pin (45) piercing the control plate (50) and contacting a disc (42) with a notched portion (42b), wherein the control pin (45) is driven synchronously with the needle (1a, 1b, 1e, 1f, 1g) and displaced in the axial direction when the control pin (45) is dependent on the manual actuation of the handwheel (HP) of the lip positioning part ( 32), is inserted into the notched part (42b) of the disc (42) in order to pivot the control plate (50) and to move the hermetic lip (7) through the control part (90) so that the suction mouth opening (6) opens the thread exit (5) of the needle eye (1c, 1d, 1h, 1i, 1j) is aligned and the hermetic lip is brought into contact with the needle (1a, 1b, 1e, 1f, 1g).
[8]
8. Pneumatic threading device (20) for a sewing machine according to claim 6, characterized in thatmultiple needles (1a, 1b, 1e, 1f, 1g) are present, and these multiple needles (1a, 1b, 1e, 1f, 1g) are divided into at least two groups, andthe pneumatic threading device also comprises a flow channel selection device (33) which selectively connects the needle (1a, 1b, 1e, 1f, 1g) of each of the at least two groups to the suction opening (28a) of the pump (PU).
[9]
9. Pneumatic threading device for a sewing machine according to claim 1, characterized in thatthe pneumatic threading device further comprises:a looper thread insertion inlet (35) to which an ejection opening (28b) of the pump (PU) is connected,a looper thread guide pipe (37) which is connected to the looper thread introduction port (35) and conveys one end of the looper thread (3f-3h) which is introduced into the looper thread introduction port (35) by compressed air from the discharge port (28b) ,a looper thread connecting pipe (39) which is inserted into the looper thread guide pipe (37) at the time of the looper threading and which touches the looper hole entrance (2g-2i), anda conduit connecting mechanism (140) which causes the looper thread connecting conduit (39) to contact the looper hole entrance (2g-2i) and the looper threading into the looper hole (2d-2f) through the looper thread connecting conduit (39) via the looper thread guide Line pipe (37) leads through starting from the looper thread insertion entrance (35), whereby at the time of the looper threading one end of the looper thread (3f-3h) is inserted into the looper thread insertion entrance (35), and wherein the looper thread connection line pipe (39) from the looper hole entrance (2g-2i) is separated when the stitch is formed by the stitch-forming device (4) in cooperation with the hook (2) by entwining the needle thread (3a-3e) which is threaded into the needle eye (1c-1j) with the looper thread (3f-3h) that is threaded into the looper hole (2d-2f).
[10]
10. Pneumatic threading device (20) for a sewing machine according to claim 9, characterized in thatthe line pipe connecting mechanism (140) has a further operating part (141) which is attachable to a sewing machine bed in order to position and hold the looper thread connecting line pipe (39) in a preparatory position by the manual operation of the manual operating lever (69), anda looper threading positioning part (142) for positioning the looper thread connecting conduit tube (39) from the preparatory position to a looper threading position in response to the manual operation of the handwheel (HP) of the needle threading positioning part.
[11]
11. Pneumatic threading device (20) for a sewing machine according to claim 10, characterized in thatthe looper threading positioning part (142) comprises a positioning pin (147) which is driven in synchronism with the looper (2a-2c), contacts a disc (143) with a notched part (144), and which is displaced in the axial direction when the positioning pin (147) is inserted into the notched part (1.44) of the disc (143) in response to the manual operation of the handwheel (HP) of the lip positioning part to move the control plate (50) and to move the looper thread connecting conduit tube ( 39) so that it is aligned with the gripper hole entrance (2g-2i) and touches it.
[12]
12. Pneumatic threading device (20) for a sewing machine according to claim 10, characterized in thatthe pneumatic threading device (20) furthermore has a flow channel switchover device (150), the switchover at the time of needle threading taking place in such a way that the needle thread suction pipe (40a-40e) with the suction opening (28a) and the looper thread connecting pipe (39) is connected to an atmosphere opening (60d), and the switching occurs at the time of the looper threading in such a way that the discharge opening (28b) is connected to the looper thread connecting pipe (39) and the suction opening (28a) is connected to a further atmosphere opening (44c).

类似技术:

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同族专利:

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公开号 | 公开日

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DE112016003114T5|2018-05-17|

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US20190048503A1|2019-02-14|

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JP6866968B2|2021-04-28|

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JP2017140228A|2017-08-17|

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AU2016392328A1|2018-03-22|

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TWI688688B|2020-03-21|

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CN107849769A|2018-03-27|

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CN107849769B|2021-06-01|

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WO2017138163A1|2017-08-17|

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KR20180106848A|2018-10-01|

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TW201728798A|2017-08-16|

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US10472754B2|2019-11-12|

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JP2008036341A|2006-08-10|2008-02-21|Juki Corp|Sewing machine|

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JP4741701B2|2009-08-17|2011-08-10|株式会社鈴木製作所|Sewing machine gas transfer threading device|

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JP5974214B2|2011-09-20|2016-08-23|株式会社鈴木製作所|Sewing machine gas transfer threading device|

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JP6078736B2|2012-07-13|2017-02-15|株式会社鈴木製作所|Sewing machine gas transfer threading device|CN110552124A|2018-05-31|2019-12-10|昆山市苞蕾众创投资管理有限公司|Pistol type threading apparatus|

法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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JP2016023688A|JP6866968B2|2016-02-10|2016-02-10|Sewing machine threading device|

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PCT/JP2016/069416|WO2017138163A1|2016-02-10|2016-06-30|Sewing machine threading device|

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