• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A needle drive for an embroidery machine, comprising a drive pawl (4) which has a recess (21) in which a drive rod (7) engages, a hold-down force acting between the drive rod and the drive pawl, the hold-down force acting on the drive pawl (4 ) on the drive rod (7) presses, only in the region of the half-open recess (21) itself, at the drive end of the drive pawl (4) is generated.
    公开号:CH707188B1
    申请号:CH01631/13
    申请日:2013-09-24
    公开日:2017-07-14
    发明作者:Enzler Daniel；Frei Simon；Gerhard Friedrich；Ulmann Andreas
    申请人:Saurer Ag；
    IPC主号:
    专利说明:

    Description: [0001] The invention relates to a needle drive for an embroidery machine according to the preambles of claims 1 and 9.
    In embroidery machines of the type mentioned a variety of embroidery needles is acted upon by a common drive. The drive consists essentially of a drive shaft which is non-rotatably connected to a number of levers which are driven in a pivoting direction oscillating by the drive shaft. The free ends of the levers are therefore pivoted in an oscillating manner through an angular range of approximately 25 degrees, and the upper ends of the levers are connected to a drive rod, which generally extends over the entire machine length of the embroidery machine.
    The drive rod is therefore oscillating by e.g. moved a pivoting range of 25 degrees. On the drive rod a number of parallel and juxtaposed drive pawls are placed. The connection between the drive pawl and the drive rod is formed by a semi-open recess at the rear end of the drive pawl, which at least partially surrounds the approximately round profiled drive rod, so as to allow the displacement drive of the drive pawl.
    The drive pawl in turn is designed as an elongated part - usually made of plastic - and carries at the front end a needle carrier, at its front end turn an embroidery needle is arranged.
    The needle carrier is slidably held in two spaced sliding bearings, wherein the sliding bearings are accommodated in a housing which is held stationary on the machine.
    In order to allow the shutdown of the needle in a certain working position, it is known to arrange a pawl below the needle carrier, which forms a pivotable nose, so that at a certain pivot position of the pawl pushes the nose against the underside of the drive pawl and this with their half-open recess out of engagement with the drive rod brings. In this way, any drive pawl can be brought out of engagement with the oscillating driven drive rod.
    In order to prevent accidental lifting of the drive rod from the half-open recess at the rear end of the drive pawl, it is known to pre-load the drive pawl by a spring so that it is held with its half-open recess under the force of the spring on the drive rod.
    If therefore the drive pawl be disengaged from the drive rod, the spring force of the drive pawl down-holding spring must be overcome to bring the half-open recess of the drive pawl out of engagement with the drive rod.
    It is known in the art to arrange the said hold-down spring in the connection area between the needle carrier and the drive pawl.
    This hold-down spring generates a relatively strong, undesirable torque on the needle carrier, which means that the needle carrier associated slide bearing are claimed in an undesirable manner with a tilting force, resulting in premature wear of the sliding surfaces of these plain bearings.
    Especially at high speeds, the problem is that due to the not only oscillating in one axis center of gravity of the drive pawl there is a danger that the drive-side recess of the drive pawl, which partially surrounds the drive rod, out of engagement with this drive rod. To avoid this, a relatively high spring force of the hold-down spring must be generated in order to ensure a secure engagement of the half-open recess of the drive pawl on the drive rod. However, the higher the spring force, the higher the tilting or canting of the needle carrier in the associated plain bearings on the housing, and the higher the wear.
    In addition, arise at high speeds additional vibrations and vibrations on the drive pawl, which also have the tendency to bring the drive-pawl-side recess out of engagement with the drive rod. Again, this requires ever higher spring forces, which is undesirable.
    The invention is therefore the object of developing a needle drive for an embroidery machine of the type mentioned so that the needle carrier associated plain bearings are subject to much lower wear.
    To solve the problem, the invention is characterized by the technical teaching of claims 1 and 9.
    It has been recognized as a disadvantage that the bias voltage serving hold-down spring is located far away from the drive side of the drive pawl, which creates an undesirable torque on the drive pawl and the needle carrier received in the drive pawl due to a resulting lever arm.
    According to the invention it is therefore provided that the hold-down force which presses the drive pawl on the drive rod, according to claim 1 now only in the region of the half-open recess in the drive pawl itself is generated. An unfavorable leverage with a remote from this recess hold-down spring is thus avoided.
    This eliminates the considered disadvantageous torque on the needle carrier and the plain bearings are no longer biased with a tilting moment of the needle carrier.
    Essential feature of the invention is therefore that the belonging to the prior art hold-down spring omitted, which exerted undesirably not only a hold-down torque on the drive-side end of the drive pawl, but in an undesirable manner additionally a tilt or torque on the housing side Slide bearing of the needle carrier exercised. This is because the hold-down spring was arranged approximately in the center region or in the front region of the drive pawl and therefore undesirably not only produced a hold-down torque but additionally a tilting moment.
    The claims 2, 5 and 9 describe three different ways, all of which serve the solution of the same task, namely to remove the known, a hold-down spring associated tilting moment and only a low-holding force on the drive side end of the drive pawl on the drive rod produce.
    It is a hold-down force which is generated directly on the drive-side end of the drive pawl between the recess of the drive pawl and the drive rod, without a spring is used, which additionally undesirably produces a tilting moment on the housing side slide bearing of the needle carrier ,
    Thus, there are three alternative embodiments, all of which serve the solution of the same task, namely to avoid increased wear on the housing side slide bearing of the needle carrier to prevent a force acting on the sliding bearing tilting moment does not arise.
    With the invention it is therefore provided that the spring is eliminated and that instead a hold-down force is generated directly on the drive side of the drive pawl.
    This hold-down force is formed according to a first embodiment of the invention according to claim 2 as a magnetic force, which means that acts between the drive-side end of the drive pawl and the drive rod, a magnetic force which holds the two parts together by at least one permanent magnet.
    Only when lifting the drive pawl due to the operation of the pawl of this magneto-network is to be repealed by simply pushes the pawl against the underside drive pawl and this lifts out against the magnetic force from the drive pawl.
    With the application of such a magnetic force, therefore, the advantage is achieved that an undesirable tilting moment - as previously necessary solution for a spring - omitted, because a spring is completely eliminated. It is only a hold-down force generated at the drive end of the drive pawl between the arranged there recess of the drive pawl and the drive rod.
    In a first embodiment, it is provided that the drive pawl consists of a plastic material and that in the plastic material, approximately above the recess of the drive pawl, one or more permanent magnets are arranged, which generate a hold-down force together with the ferromagnetic drive rod.
    The drive rod must therefore be made of a metal material which is magnetic. It is not necessary for the solution that the drive rod consists of an iron material. It can also consist of a plastic material, and it can be embedded corresponding magnetic parts.
    Likewise, it is possible in another embodiment that in the drive rod itself even more magnets are arranged, which cooperate with the embedded in the drive pawl magnet.
    The magnets do not necessarily have to be formed as rectangular magnets. It may also be shell-like magnets, these shell-like magnets surround or surround the recess in the drive pawl and therefore interact with the magnetic drive rod to a large diameter range. In this way, a very high magnetic force between the drive pawl and the drive rod is generated in a confined space.
    In a second solution according to claim 5, the hold-down force between the drive-side end of the drive pawl and the drive rod is realized by a mechanically acting latching connection.
    This mechanical latching connection can be formed either by the fact that the recess itself is designed as a latching connection, so that the drive rod engages only by elastic overcoming a locking projection on a latching projection of the drive pawl into the recess and is held there by the latching force.
    In a further embodiment, it may be provided that the latching force is applied by one or more spring-loaded detent balls, which can be brought into latching position on the circumference of the drive rod.
    Instead of a detent ball and rollers or other locking elements may be used, such as locking pins, or the spring itself may be formed as a locking element.
    In a third embodiment of the inventive concept, the subject of the independent claim 9, it is provided that the hold-down force is effected by a mechanical slotted guide. That is, the holddown between the drive pawl and the drive rod is effected by a mechanical slotted guide such that a stationary link, for example, is arranged above the drive pawl and that the drive pawl is connected to at least one guide pin extending in certain ranges of movement of the drive pawl at the bottom the backdrop in the region of a support surface applies, to prevent the drive-side recess of the drive pawl comes out of engagement with the drive rod.
    In another displacement position of the drive pawl, however, the drive latch-side recess of the drive pawl is to be disengaged from the drive rod. For this reason, in this range of motion, the guide pin connected to the drive pawl can be pushed past the gate, so as to enable a lifting of the drive pawl-side recess from the surface of the drive rod.
    A further embodiment of this inventive concept provides that the slotted guide is now no longer designed as outside and fixed to the housing backdrop, but that a slotted guide is arranged on the drive-side end of the drive pawl itself. In this case, the drive rod is arranged with a remote from the drive rod and connected to this driving pin. The driving pin is guided in an approximately slot-shaped, cranked link guide on the drive-side end of the drive pawl and cooperates with this link guide.
    Also in this slotted guide is ensured that only in a certain displacement position of the drive pawl the drive pawl-side recess can be disengaged from the drive rod.
    Such a Aushebestellung is the fully retracted position of the drive pawl, because in this retracted position no more dynamic forces acting on the pawl that would bring them out of engagement with the drive rod alone.
    Show:
    Fig. 1: Side view of a needle drive of an embroidery machine according to the prior art
    2: side view of a drive pawl with the features according to the invention according to claim 2.
    Fig. 3: sectional view through the rear end of a drive pawl with a latching connection according to claim 6.
    4: sectional view through the rear end of a drive pawl with a latching connection according to claim 7.
    5: Perspective view of the drive pawl and a slotted guide according to claim 9.
    Fig. 6a-Fig. Fig. 6b shows another embodiment of a slotted guide between the drive pawl and the drive rod in two different pivot positions. With reference to Fig. 1, which describes the prior art, the parts of the invention will be described. Therefore, all parts shown in Fig. 1 are also belonging to the invention, with the exception that in the invention, the spring 6 shown in Fig. 1 should be omitted.
    The needle 1 is attached to the front of the needle carrier 2. The needle carrier 2 is mounted longitudinally displaceable in the plain bearings 3a, 3b. The drive pawl 4 is connected at the pivot point 5 with the needle carrier 2 and drives the needle carrier 2 so on. The drive pawl 4 is located at its rear end on the drive rod 7, which is oscillated by the lever 8 about the pivot point 9 back and forth.
    If the needle 1 does not work, the drive pawl 4 is raised so that it no longer rests on the drive rod 7. This is done according to Fig. 1 by a pawl 15 which is pivotally mounted about a pivot point 16 and can be pivoted in the direction of arrow 17. In this position (pivoting in the direction of arrow 17) presses the nose 18 against the underside of the drive pawl 4 and pushes them against the force of the spring 6 with its recess 21 out of engagement with the drive-side drive rod. 7
    Thus, the rear part of the drive pawl 4 is no longer in engagement with the drive rod. 7
    In order to enable a renewed engagement and a displacement drive of the drive pawl 4, the pawl 15 is pivoted in the opposite direction to the arrow 17, so that the spring 6 in turn applying its spring load, the recess 21 at the rear end of the drive pawl 4 in engagement with the outer circumference the drive rod 7 brings.
    A disadvantage of the solution according to the prior art is that the spring 6 exerts an undesirable tilting moment on the needle carrier 2, because this needle carrier in the front and rear bearings 3a, 3b not only in the direction of arrow 20 is displaceable, but in addition unwanted torque 10 is exerted on the needle carrier 2. As a result, a lower wear surface 25 on the front slide bearing 3a and an upper wear surface 26 on the rear slide bearing 3b are particularly stressed, which leads to undesirable wear of the slide bearings 3.
    According to the invention should therefore account for the spring 6 to remove the unwanted torque 10 and relieve the sliding bearing 3 of unwanted tilting moments.
    For the sake of further description, it will be mentioned that the lever 8 between the positions 12, 13 can be pivoted approximately at an angle of about 25 degrees and not only exerts a pure linear movement in the direction of the arrow 20, but also an arcuate movement circle 11, which also acts in an undesirable manner on the needle carrier 2.
    The plain bearings 3a, 3b are otherwise received in a housing 14 to which the pawl 15 is pivotally mounted in the pivot point 16.
    In the illustrated embodiment, the spring 6 acts on a bearing block 19 on the drive pawl 4 and is fastened with its other end in the bore of the needle carrier 2 and inserted there.
    In order to remove the spring with the unwanted torque 10, Fig. 2 according to the first embodiment of the invention provides that directly in the region of the recess 21 of the drive pawl, a magnetic adhesive force between this part of the drive pawl and the surface of the drive rod 7 is generated.
    In the illustrated embodiment, in this case two permanent magnets 22, 23 arranged parallel next to each other and are arranged with their polarized magnetic surfaces as close as possible above the recess 21, and thus act directly on the outer periphery 27 of the drive rod. 7
    Thus, a magnetic adhesive force between the drive-side end of the drive pawl 4 in the region of the recess 21 and the surface of the drive rod 7 is generated without an unwanted torque 10 according to FIG. 1 is generated according to the prior art.
    Instead of one or more permanent magnets 22, 23, which are approximately planar, also shell-shaped permanent magnets can be used.
    Instead of such shell-shaped permanent magnets and unipolar polarized magnetic elements can be used, and it is even possible to arrange on the surface of the drive rod 7, a first unipolar magnetizable permanent magnet and on the opposite side an oppositely polarized magnet, so that the magnetic force between the two parts the drive pawl 4 and the drive rod 7 is still improved.
    In another embodiment, a latching force is proposed instead of a magnetic force or in combination with a magnetic force. This is shown in FIG. 3. There, it can be seen that the recess 21 is associated with a detent by the recess 21 extending over an angular range of more than 180 degrees and in this area a locking projection 28 is arranged, which with an elastically acting locking projection 30 is connected, and the rest still has an inlet slope 29.
    Thus, if the drive rod 7 is inserted in the direction of arrow 48 in the recess 21, only the locking projection 28 must be resiliently overcome before the drive rod 7 engages in the recess 21.
    It is therefore a mechanically acting latching connection.
    As already stated, this mechanically acting locking connection can additionally be assigned a magnetic adhesive force according to FIG. 2.
    The same conditions apply to the further locking connection shown in Fig. 4. There is only shown that the outer circumference 21 is open and does not extend over an angle of more than 180 degrees, so that the drive rod 7 with its outer periphery 27 is readily inserted into the recess 21.
    On the outer circumference 27, however, is a spring-loaded detent ball 31, which is biased by a spring 32 against an abutment 33, so hereby a certain detent force is generated and only by overcoming this detent force the recess 21 out of engagement with the outer periphery 27 of the drive rod 7 can be brought.
    It can also be the embodiments of FIGS. 3 and 4 combined.
    The spring-loaded detent ball 31 is in this case displaceably mounted in a transverse bore 34 at the end of the drive pawl 4.
    5 shows a slotted guide according to claim 9.
    In Fig. 5 it is shown that the slotted guide consists of a housing-fixed link 35, which forms a lower support surface 39.
    When the drive pawl 4 is displaced in the direction of arrow 38 to the left, thus supported on the side surface of the drive pawl 4 guide pin 36 is supported on the support surface 39 of the link 35, so that the recess 21 of the drive pawl 4 is not out of engagement with the drive rod 7 can be brought.
    In the illustrated displacement position, however, a lifting of the drive pawl is possible because the guide pin 36 enters the region of an exemption 41 at the rear end of the gate 35 and thus the entire
    Drive pawl are raised together with the guide pin 36 fixed there in the direction of arrow 37, so that the recess 21 of the drive pawl can be disengaged from the drive rod 7.
    The distance 40 between the support surface 39 and the guide pin 36 states that the guide pin 36 slides along with a certain play on the link 35.
    6a and 6b, another embodiment of a slotted guide is shown, wherein two different functional positions are shown.
    In Fig. 6a it is shown that in the position 12, the drive pawl 4 can not be brought out of engagement with the drive rod 7. For this purpose, a driving pin 42 is connected via a coupling 43, not shown, with the central axis 47 of the drive rod 7 and engages in a first guide track 45 of a two-part link 44 a.
    The link 44 therefore consists of the first guide track 45 which is directed with its longitudinal axis approximately parallel to the motion circle 11 from the lever 8, so that in this position the driving pin 42 can not be brought out of engagement with the link 44.
    In the position 13, however, the driving pin 42 passes into the region of the second guide track 46, which is directed approximately perpendicular to the longitudinal extent of the first guide track 45, and thus can in this position, the drive pawl 4 out of engagement with the drive pin 42 is brought and dug become.
    All described embodiments are characterized in that only in the region of the drive side of the drive pawl 4, in the region of the recess 21, in conjunction with the drive-side drive rod 7, a connection force resp. a hold-down force is generated which generates no undesired torque 10 on the slide bearings 3a, 3b and thus keeps wear away from these slide bearings.
    This ensures a much longer life of the entire needle drive and higher speeds are possible.
    Drawing legend 1 Needle 2 Needle carrier 3a Slide bearing 3b Slide bearing 4 Drive pawl 5 Pivot 6 Spring 7 Drive rod 8 Lever 9 Pivot 10 Torque 11 Motion circle 12 Position 13 Position 14 Housing 15 Pawl 16 Pivot 17 Arrow direction 18 Nose (from 15)
    权利要求:
    Claims (9)
    [1]
    19 Bracket (from 4) 20 Arrow direction 21 Recess (from 4) 22 Permanent magnet 23 Permanent magnet 24 Pulling force 25 Wear surface 26 Wear surface 27 Outer circumference (from 7) 28 Detent projection 29 Intake slope 30 Detent neck 31 Detent ball 32 Spring 33 Counter bearing 34 Transverse bore 35 Slide 36 Guide pin 37 Direction of arrow 38 Arrow direction 39 Support surface (from 35) 40 Distance 41 Release 42 Drive pin 43 Coupling 44 Backing 45 Guideway 46 Guideway 47 Center axis (from 7) 48 Arrow direction Claims
    A needle drive for an embroidery machine, comprising a drive pawl (4) having a recess (21) in which a drive rod (7) engages, wherein a hold-down force between the drive rod (7) and the drive pawl (4) acts, characterized characterized in that the hold-down force which presses the drive pawl (4) on the drive rod (7), only in the region of the half-open recess (21) itself, at the drive-side end of the drive pawl (4) is generated.
    [2]
    2. needle drive according to claim 1, characterized in that the hold-down force between the drive-side end of the drive pawl (4) and the drive rod (7) acts as a magnetic force.
    [3]
    3. needle drive according to claim 2, characterized in that at least one permanent magnet above the recess (21) of the drive pawl (4) is arranged and together with a ferromagnetic, said drive rod (7) generates the hold-down force.
    [4]
    4. needle drive according to claim 3, characterized in that the or the permanent magnets rectangular or cup-shaped surround the recess (21) of the drive pawl (4) or surround.
    [5]
    5. needle drive according to one of claims 1 to 4, characterized in that the hold-down force is generated by a mechanical latching connection.
    [6]
    6. needle drive according to claim 5, characterized in that the recess (21) is designed as a latching connection, wherein the drive rod (7) by a latching projection (30) in the recess (21) engages.
    [7]
    7. needle drive according to claim 5, characterized in that the latching force is generated as a hold-down force of at least one spring-loaded detent ball (31), wherein in the latching position the detent ball (31) on the periphery (27) of the drive rod (7).
    [8]
    8. needle drive according to claim 5, characterized in that the latching connection is formed by at least one locking pin or at least one roller.
    [9]
    9. needle drive for an embroidery machine, comprising a drive pawl (4) having a recess (21) into which a drive rod (7) engages, wherein a hold-down force between the drive rod (7) and the drive pawl (4) acts, characterized characterized in that the hold-down force is generated by a stationary mechanical link (35) which presses against a guide pin (36) fixed to the drive pawl (4) and holds the drive pawl (4) in engagement with the drive rod (7).
    类似技术:
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    DE553086C|1932-06-22|Mechanical relay for telegraph apparatus
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    DE4101532A1|1992-07-23|SPREADING TOOL
    AT403125B|1997-11-25|Front jaw for a ski binding
    同族专利:
    公开号 | 公开日
    DE102012021343B4|2015-03-05|
    CH707188A2|2014-05-15|
    DE102012021343A1|2014-04-30|
    CN103789944A|2014-05-14|
    CN103789944B|2015-11-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE1485496C3|1965-11-06|1975-04-30|Rudolf 5450 Neuwied Reich|Shuttle embroidery machine|
    DE2927142C2|1979-07-05|1984-06-28|Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern|Multi-head embroidery machine|
    DE8120717U1|1981-07-15|1981-11-05|Maschinenfabrik Carl Zangs Ag, 4150 Krefeld|DEVICE FOR THE INTERRUPTION OF THE EMBROIDERY NEEDLE ON EMBROIDERY OR SEWING MACHINES|
    EP0634512A1|1993-07-10|1995-01-18|Saurer Sticksysteme Ag|Control and driving of embroidering segments|
    KR20080082361A|2007-03-08|2008-09-11|썬스타 특수정밀 주식회사|Embroidery|CN104963127B|2015-07-02|2017-10-13|吴江市震宇缝制设备有限公司|A kind of magnetic drives sewing device|
    DE102015012184B4|2015-09-17|2019-09-26|Saurer Ag|Shuttle embroidery machine with single needle guide|
    法律状态:
    2018-05-31| PK| Correction|Free format text: BERICHTIGUNG INHABER |
    优先权:
    申请号 | 申请日 | 专利标题
    DE201210021343|DE102012021343B4|2012-10-31|2012-10-31|Needle drive for an embroidery machine|
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