• 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:
    The invention relates to a needle clamping device (1) for a sewing machine needle. It comprises a recessed receiving part (7) which receives a needle shaft (15) of the sewing machine needle by attaching a flat attachment surface (15a) formed on the needle shaft (15) to a lower portion of the recessed receiving part (7), a pivotable clamping lever (19) which has a clamping arm (21) which engages the needle shaft (15) and can be freely opened and closed for the recessed receiving part (7) and is fastened to a clamping lever shaft (17) which is loosely in a long hole (13b) drilled in a mounting base (13) is fitted; and a needle holder spring (23) that elastically urges the clamp lever (19) by deflecting the needle holder spring (23) in an outer direction of a straight line that includes a The center point of the needle shaft (15) and a center point of the clamping lever shaft (17) connects to one another. The clamping arm (21) has a force-acting locking part (22) which, in the assembled state of the sewing machine needle, moves around a circumferential surface of the needle shaft (15) against the elasticity of the needle holder spring when the clamping lever (19) is pivoted in the clamping direction. The force acting locking part (22) passes a branch point position (tp) at which the elasticity of the needle holder spring (23) becomes maximum and which maintains a stable clamping state by the elasticity of the needle holder spring (23). Further, a cam (71) and a cam follower (70) which engages with the cam (71) are provided on the clamp arm. The elongated hole (13b) has three flat surfaces (13d, 13e, 13f) on which the clamping lever shaft (17) moves while the clamping lever (19) opens and closes.
    公开号:CH714898B1
    申请号:CH01031/19
    申请日:2017-08-29
    公开日:2021-09-15
    发明作者:Sakuma Tohru；Suzuki C/O Suzuki Manufacturing Ltd Mitsuharu
    申请人:Suzuki Mfg；
    IPC主号:
    专利说明:

    TECHNICAL AREA
    The present invention relates to a needle clamping device for a sewing machine needle, and more particularly it relates to a clamping device for a sewing machine needle for firmly and easily attaching, fixing or replacing a needle of a sewing machine such as a lockstitch sewing machine, an overcasting machine, a double chainstitch sewing machine or a cover stitch sewing machine Needle holder.
    STATE OF THE ART
    Conventionally, in a lockstitch sewing machine, a lockstitch sewing machine, a double chain stitch sewing machine or a cover stitch sewing machine, etc., as is known, a fabric to be sewn is held sandwiched between a needle plate and a presser foot, which is pressed by a presser bar, and stitch by stitch by one Material slide mechanism fed, with stitches being formed on the fabric by the sewing machine needle and a shuttle hook or a gripper as a loop catching device.
    The shuttle hook or the gripper as a loop catching device and the knife gate mechanism are, however, each driven by a drive mechanism starting from a lower shaft, which is a drive shaft. On the other hand, the sewing machine needle is screwed to the needle holder by a screw fixed to the needle bar driven by an upper shaft, with transmission from the lower shaft through a lower shaft pulley, a drive belt and an upper shaft pulley (see Patent Documents Nos. 1 to 4).
    PRIOR ART DOCUMENTS
    PATENT DOCUMENTS
    [Patent Document No. 1] JP H05-085380U [Patent Document No. 2] JP 2004-121280A [Patent Document No. 3] JP 2007-151777A [Patent Document No. 4] JP 3181298U
    SUMMARY OF THE INVENTION
    ISSUE POINTS TO BE SOLVED BY THE INVENTION
    As far as this clamping device, hereinafter also called needle holder, concerns for a sewing machine needle, while on the one hand a sewing machine needle shaft is held at a fastening position in the vertical direction inside the needle holder, on the other hand the sewing machine needle is screwed through the screw to the needle holder by a flat attachment surface provided on a peripheral surface of the sewing machine needle shaft, attached to and held on a flat attachment surface on the inside of the needle holder. In this case, a process in which one or more sewing machine needles are to be screwed through the screw to each needle holder by firmly attaching and holding them to the flat mounting surface on the inside of the needle holder with a screwdriver is a complicated work for operators the sewing machine.
    The present invention was developed to remedy these deficiencies. An object of the present invention is to provide a sewing machine needle clamping device in which the operation in which the sewing machine needle must be tightly screwed to the needle holder by means of a screwdriver through the screw is unnecessary and the mechanism is simplified, the operation is performed by a one-time operation and the sewing machine needle of the sewing machine is firmly and easily attached and fixed to the needle holder.
    MEANS TO SOLVE THE PROBLEM POINTS
    This object is achieved by a needle clamping device according to the invention (hereinafter also called clamping device) for a sewing machine needle for fastening the sewing machine needle to the needle clamping device. The needle clamping device comprises (see. Claim 1): a recessed receiving part that receives a needle shaft of the sewing machine needle by attaching a flat mounting surface formed in the needle shaft to a lower portion of the recessed receiving part, a pivotable clamp lever that has a clamp arm which comes into engagement with the needle shaft of the sewing machine needle and can be freely opened and closed for the recessed receiving part and is attached to a clamping lever shaft which is loosely fitted into an elongated hole which is drilled in a fastening base of the needle clamping device, and a needle holder spring which urges the clamp lever elastically by deflecting the needle holder spring in an outward direction of a straight line connecting a center point of the needle shaft in the assembled state of the sewing machine needle and a center point of the clamp lever shaft, the clamp arm having a force-acting locking part which moves in the assembled state of the sewing machine needle around a circumferential surface of the needle shaft of the sewing machine needle against the elasticity of the needle holder spring when the clamping lever is in the state in which the needle shaft of the sewing machine needle is in engagement with the recessed receiving part and at a fastening position in the vertical direction is pivoted in a clamping direction, wherein the force acting locking part passes a branch point position at which the elasticity of the needle holder spring becomes maximum and which maintains a stable clamping state by the elasticity of the needle holder spring, a cam is provided in the needle clamping device, a cam follower, the comes into engagement with the cam, is provided on the clamp arm, and the elongated hole has three flat surfaces as a path of movement on which the clamp lever shaft moves while the clamp lever opens and closes.
    Further, in the clamping device for a sewing machine needle of the present invention, a locking piece is provided in the needle holder, which is movable in a direction that is perpendicular to the direction of an axis of the needle, and a locking piece stopper is provided, which the locking piece in a Direction that is perpendicular to a direction of an axis of the sewing machine needle, a clamp stopper that prevents the opening of the clamp lever by being locked to the locking piece when the clamp lever is closed, is provided in the clamp lever, and a lock release button that the lock the locking piece and the clamping stopper releases when the clamping lever is opened, is provided in the clamping lever.
    Further, in the clamping device, the needle holder that fixes the sewing machine needle is formed with an inner shape that is matched to the needle shaft or an outer shape of the needle to prevent the needle from slipping out of the needle holder when the needle penetrates a fabric and when the needle subsequently emerges from the fabric.
    As for the clamping device for a sewing machine needle of the present invention, so in the clamping device which secures the sewing machine needle, a spring for preventing the needle from being forgotten is provided, which elastically urges the needle in a direction in which the The needle is separable from the recessed receiving part when the clamping lever is open.
    Further, in the clamping device, the needle clamping device has a mounting base, and the mounting base forms a mounting hole set to a D-shaped cross-sectional shape including a flat mounting surface for an upper end of the needle shaft of the sewing machine needle so as to be able to to attach the sewing machine needle when the attachment surface of the needle shaft is attachable to the flat attachment surface of the recessed receiving part in the needle clamp.
    EFFECT OF THE INVENTION
    As for the clamping device for a sewing machine needle of the present invention, this device offers the basic merits that the mechanism is simplified and the operation is performed by a small number of one-time touches, and that the needle of a sewing machine such as a lockstitch sewing machine , an overcast sewing machine, a double chainstitch sewing machine or a cover stitch sewing machine can be firmly and easily attached, fixed or exchanged to the needle holder.
    As for the clamping device for a sewing machine needle of the present invention, in addition to the above basic merits, when the sewing machine needle is clamped, the wear due to frequent engagement between the needle shaft surface in which the name of the manufacturer of the sewing machine needle is and an engraving mark are engraved and a force-acting locking portion of the clamp arm is eliminated, and the sewing machine needle can be securely clamped to the needle holder.
    With regard to the clamping device for a sewing machine needle of the present invention, in addition to the above basic merits, when the clamping lever is closed, the clamping lever occurs due to inadvertent movement of the needle in a lateral direction and in a Forward and backward direction is opened, and that there occurs the error that the clamping fixation of the needle is released, this device can serve as a safety device that prevents the sewing machine needle from being broken and scattered by the collision with other parts.
    As for the clamping device for a sewing machine needle of the present invention, in addition to the above basic merits, when the sewing machine needle penetrates a fabric that is difficult to pierce by the needle, in other words, when the sewing machine needle enters a If the fabric which has strong friction enters and the sewing machine needle comes out of the fabric, this device can prevent the sewing machine needle from slipping out of the needle holder by the force of the friction with the fabric.
    With regard to the clamping device for a sewing machine needle of the present invention, in addition to the above basic merits, a safety device is provided which ensures that the sewing machine needle does not fall when the sewing machine needle is attached to the needle holder. On the other hand, the clamping is prevented from being forgotten when the clamping lever is opened because the sewing machine needle falls out of the recessed receiving part.
    As for the clamping device for a sewing machine needle of the present invention, in addition to the above basic merits, the sewing machine needle can be attached to the recessed receiving part only when the sewing machine needle is attached in the direction in which the flat Attachment surface of the needle shaft is attached to the flat attachment surface of the recessed receiving part, whereby the attachment can be performed safely.
    BRIEF DESCRIPTION OF THE DRAWINGS
    [Fig.1] As seen from the front, the overall perspective view of the sewing machine to which the clamping device for a sewing machine needle according to the present invention is attached. [Fig. 2 (a)] Front view of the sewing machine needle clamping device of the present invention, which clamps the sewing machine needle to the needle holder. [Fig. 2 (b)] A bottom view of the sewing machine needle clamping device according to the present invention, which clamps the sewing machine needle to the needle holder. [Fig. 2 (c)] A rear view of the sewing machine needle clamping device according to the present invention, which clamps the sewing machine needle to the needle holder. [Fig. 2 (d)] A perspective view of the clamping device for a sewing machine needle according to the present invention, which clamps the sewing machine needle to the needle holder. [Fig. 3] (a) is an exploded perspective view of the sewing machine needle clamp according to the present invention, and (b) is a partial perspective view of the sewing machine needle clamp viewed from an arrow A direction of (a). [Fig. 4 (a)] A bottom view of the clamping device for a sewing machine needle according to the present invention in a state before the sewing machine needle is clamped to the needle holder. [Fig. 4 (b)] A bottom view of the clamping device for a sewing machine needle according to the present invention in a state immediately after the process of clamping the sewing machine needle to the needle holder. [Fig. 4 (c)] A bottom view of the clamping device for a sewing machine needle according to the present invention in a state after further continuation of an operation of clamping the sewing machine needle to the needle holder. [Fig. 4 (d)] A bottom view of the clamping device for a sewing machine needle according to the present invention in a state in which an operation of clamping the sewing machine needle to the needle holder is completed. [Fig. 5 (a)] A movement-oriented schematic view of the clamping device for a sewing machine needle according to the present invention in a state before the sewing machine needle is clamped to the needle holder. [Fig. 5 (b)] A movement-oriented schematic view of the clamping device for a sewing machine needle according to the present invention in a state immediately after the process of clamping the sewing machine needle to the needle holder. [Fig. 5 (c)] A movement-oriented schematic view of the clamping device for a sewing machine needle according to the present invention in a state after further continuation of an operation of clamping the sewing machine needle to the needle holder. [Fig. 5 (d)] A movement-oriented schematic view of the clamping device for a sewing machine needle according to the present invention in a state in which an operation of clamping the sewing machine needle to the needle holder is completed. [Fig. 5 (e)] An explanatory view showing the moving path of the clamp lever shaft in the elongated hole provided in the needle holder of the clamp device for a sewing machine needle according to the present invention. Bottom view and partial enlarged view of the clamping device. [Fig. 6 (a)] A bottom view of the sewing machine needle clamp of the present invention, which securely clamps the sewing machine needle to the needle holder and prevents the clamp from being loosened. [Fig. 6 (b)] A bottom view of the sewing machine needle clamp of the present invention, which securely clamps the sewing machine needle to the needle holder and prevents the clamp from being loosened. [Fig. 6 (c)] A bottom view of the sewing machine needle clamp of the present invention, which securely clamps the sewing machine needle to the needle holder and prevents the clamp from being loosened. [Fig. 6 (d)] A perspective view of the sewing machine needle clamping device of the present invention, which securely clamps the sewing machine needle to the needle holder and prevents the clamp from being loosened. [Fig. 7] Partial enlarged front view of the sewing machine needle clamping device of the present invention, which securely clamps the sewing machine needle to the needle holder and prevents the needle from slipping out. [Fig. 8 (A)] Front view of the sewing machine needle clamping device of the present invention, which prevents forgetting to clamp the sewing machine needle. [Fig. 8 (b)] A perspective view of the sewing machine needle clamping device of the present invention which prevents forgetting to clamp the sewing machine needle. [Fig. 9 (a)] A bottom view of the sewing machine needle clamping device of the present invention, which performs a safe operation of aligning the sewing machine needle when the sewing machine needle is securely clamped to the needle holder. [Fig. 9 (b)] A bottom view of the sewing machine needle clamping device of the present invention, which performs a safe operation of aligning the sewing machine needle when the sewing machine needle is securely clamped to the needle holder. [Fig. 9 (c)] A bottom view of the sewing machine needle clamping device of the present invention, which performs a safe operation of aligning the sewing machine needle when the sewing machine needle is securely clamped to the needle holder. [Fig. 9 (d)] A bottom view of the sewing machine needle clamping device of the present invention, which performs a safe operation of aligning the sewing machine needle when the sewing machine needle is securely clamped to the needle holder. [Fig. 9 (e)] A perspective view of the sewing machine needle clamping device of the present invention, which performs a safe operation of aligning the sewing machine needle when the sewing machine needle is securely clamped to the needle holder. [Fig. 9 (f)] A perspective view of the sewing machine needle clamping device of the present invention, which performs a safe operation of aligning the sewing machine needle when the sewing machine needle is securely clamped to the needle holder. [Fig. 9 (g)] A bottom view of the sewing machine needle clamping device of the present invention, which performs a safe operation of aligning the sewing machine needle when the sewing machine needle is securely clamped to the needle holder.
    MODE FOR CARRYING OUT THE INVENTION
    In the following, some preferred embodiments in which the clamping device for a sewing machine needle of the present invention is applied to an overcasting sewing machine (hemstitch sewing machine) having 2 (two) needles and 4 (four) threads, referring to the drawings in detail described.
    As shown in Fig. 1, in this hemstitch sewing machine (overcasting machine) 40 with 2 needles and 4 threads, the fabric to be sewn is sandwiched between the needle plate 42 and the presser foot, which is pressed by the presser bar, stitch by stitch fed by the material slide mechanism, with stitches being formed on the fabric by the sewing machine needle 3 and the looper 44 as a loop catcher.
    This gripper 44 as a loop catcher and the knife gate mechanism are each driven by a drive mechanism from the lower shaft 46, which is the drive shaft. On the other hand, the sewing machine needle 3 is fixed to the needle holder 5, which is fixed to the needle bar 58, which is driven by a needle bar drive mechanism 56 with the upper shaft 54, a transmission with a rotation ratio of 1: 1 from the lower shaft 46 via the pulley of the lower shaft 48, the Drive belt 50 and the pulley of the upper shaft 52 takes place. The upper shaft 54 and the needle bar drive mechanism 56 are attached to a sewing machine arm. The throat plate 42, the looper 44 as a loop catcher and the material slide mechanism are attached to a sewing machine bed.
    As for this hemstitch sewing machine (overcasting machine) 40 with 2 needles and 4 threads, the fabric to be sewn is sandwiched between the needle plate 42 and the presser foot pressed by the presser bar and stitch by stitch by the presser mechanism fed, with stitches being formed on the fabric by the sewing machine needle 3 and the looper 44 as a loop catcher. However, since the number, specific structure, and operation of the throat plate 42 and the looper 44 as the loop catcher for forming the stitches are publicly known or well known, a detailed description is omitted here.
    As shown in Fig. 2 (a) to Fig. 2 (d), Fig. 3, Fig. 4 (a) to Fig. 4 (d) and Fig. 5 (a) to Fig. 5 (d) As can be seen, a feature of the present invention is the clamping device for a sewing machine needle 1 which fixes the sewing machine needle 3 to the recessed receiving portion 7 of the needle holder 5. The needle holder 5 includes a cylindrical fixing portion 11 at which the needle holder 5 is fitted into the needle bar 58 while being fixed by the screw 9, and a fixing base 13 integrally extending up and down therefrom. Although the needle holder 5 in this embodiment may be attached as a separate part from the needle bar 58, the needle holder 5 may be formed integrally with the needle bar 58 and attached thereto. The needle holder 5 has the aforesaid recessed receiving part 7 which receives the needle shaft 15 of the sewing machine needle 3 at a central mounting portion 13c in the mounting base 13. The recessed receiving part 7 and the fixing base 13 of the needle holder 5 are each arranged symmetrically with respect to a longitudinal center section of the needle holder 5.
    As far as the two sewing machine needles 3 are concerned, an end face of the shaft of the needle shaft 15 is each at different fastening positions in the vertical direction inside the needle holder 5, and a flat fastening surface 15a, which is provided on the peripheral surface of the needle shaft 15 of the sewing machine needle 3, is on one flat mounting surface 7a of the recessed receiving part 7 inside the needle holder 5 attached.
    The needle holder 5 has a clamping lever 19 which can be freely opened and closed and is attached to a clamping lever shaft 17 which is pivotally mounted in an elongated hole 13b drilled in a mounting portion 13a which extends from top to bottom in the mounting base 13des Needle holder 5 for the recessed receiving part 7 is provided. When the clamp lever shaft 17 is pivotably mounted in the elongated hole 13b, it can pivot movement while being stopped so that it cannot move in the vertical direction. A longitudinal direction of the elongated hole 13b is the same direction as a straight line L2 connecting a center point N of the needle shaft 15 of the sewing machine needle 3 received in the receiving recessed part 7 of the needle holder 5 and a center point P of the clamp lever shaft 17 (Fig. 5 (a)) ). The clamp lever 19 has a clamp arm 21 which moves around the peripheral surface of the needle shaft 15 of the sewing machine needle 3 without touching it.
    In addition, the elongated hole 13b is designed in the form of a deformed elongated hole and has three surfaces 13d, 13e, 13f on which the cam follower 70 overcomes the cam 71 and moves as a path of movement of the clamping lever shaft 17, which becomes the center of rotation P of the clamping lever 19 (Fig . 5 (e)). The center point P of the clamping lever shaft 17 follows the centers P1, P2, P3 inside the deformed elongated hole 13b. The three surfaces 13d, 13e, 13f are located between arcuate surfaces 13g, 13h, 13i, which have the same diameter as a radius “r” of the clamping lever shaft 17. As for the configuration of the elongated holes 13b, the details will be described later.
    Further, the needle holder 5 has a plate-shaped needle holder spring 23 which elastically urges the clamp lever 19 in an outer direction of the straight line connecting the center N of the needle shaft 15 of the sewing machine needle 3 and the center P of the clamp lever shaft 17 with each other.
    As far as the clamping device for a sewing machine needle 1 is concerned, the clamping arm 21 has a force-acting locking part 22,which moves against the elasticity of the needle holder spring 23 around the circumferential surface of the needle shaft 15 of the sewing machine needle 3 without touching it when the clamping lever 19 is in the state in which the needle shaft 15 of the sewing machine needle 3 is in engagement with the recessed receiving part 7 and at the fastening position 7b (Fig. 2 (a)) is applied in the vertical direction, swings to a clamping direction "a" (FIGS. 4 (b) to 4 (d), FIGS. 5 (a) to 5 (d)), andwhich passes a branch point position tp (Fig. 5 (c)) at which the elasticity of the needle holder spring 23 becomes maximum, andwhich maintains a stable clamping state by the elasticity of the needle holder spring 23.
    As for the sewing machine needle clamping device 1 of the present invention constructed in this way, in the state before the sewing machine needle 3 is clamped to the needle holder 5, the needle shaft 15 of the sewing machine needle 3, the clamp lever shaft 17 of the needle holder 5, and the clamp arm 21 of the clamp lever 19 die positional relationships shown in Fig. 4 (a).
    As for the clamping device for a sewing machine needle 1 of the present invention, for example, the end face of the shaft of the needle shaft 15 of the sewing machine needle 3 is at various fastening positions in the vertical direction inside the needle holder 5, and the flat fastening surface 15a, which is on the peripheral surface of the needle shaft 15, the sewing machine needle 3 is attached to the left of the flat attachment surface 7a of the recessed receiving part 7 inside the needle holder 5, and in the state immediately after the clamp lever 19 is moved to the right in the clamp direction "a", the clamp lever shaft 17 is moved in the direction of the straight line, which connects the center point N of the needle shaft 15 of the sewing machine needle 3 and the center point P of the clamping lever shaft 17 with each other, is elastically pushed back by the needle holder spring 23 and pressed against a hole surface in the direction of the outside of the elongated hole 13b (Fig. 5 (b)).
    As for the clamping device for a sewing machine needle 1 of the present invention, the end face of the shaft of the needle shaft 15 of the sewing machine needle 3 is at the fastening position in the vertical direction inside the needle holder 5, and the flat fastening surface 15a, which is on the peripheral surface of the needle shaft 15 of the sewing machine needle 3 is provided, is attached to the flat fastening surface 7a of the recessed receiving part 7 inside the needle holder 5, and in the state after the further continuation of the clamping process of the clamping lever 19 in the direction of the arrow "a", the tip 21a of the clamping arm 21 of the clamping lever 19 resists, ie the force effect Locking part 22, the elastic recoil of the needle holder spring 23 to overcome the needle shaft 15 of the sewing machine needle 3, and moves toward the needle shaft 15 of the sewing machine needle 3 inside the elongated hole 13b (Fig. 5 (b)).
    As for the clamping device for a sewing machine needle 1 of the present invention, in the state in which the end face of the shaft of the needle shaft 15 of the sewing machine needle 3 is abutted at the fastening position in the vertical direction inside the needle holder 5, the flat fastening surface 15a, which is at the Circumferential surface of the needle shaft 15 of the sewing machine needle 3 is attached to the flat mounting surface 7a of the recessed receiving part 7 inside the needle holder 5 and completes the clamping operation of the clamping lever 19 in the direction of arrow "a"; In other words, in the clamped state, when the tip 21a of the clamp arm 21 of the clamp lever 19, that is, when the force acting locking part 22 overcomes the branch point position tp at which the elastic force of the needle holder spring 23 becomes maximum, the curvature of the needle shaft 15 of the sewing machine needle 3 and the curvature of the clamp arm correspond to each other 21 of the clamp lever 19, whereby the clamp lever shaft 17 returns to the hole surface toward the outside of the elongated hole 13b in the direction of the straight line connecting the center N of the needle shaft 15 of the sewing machine needle 3 and the center P of the clamp lever shaft 17, the center C of the engaging surface 21b of the The clamp arm 21 and the center N of the needle shaft 15 of the sewing machine needle 3 correspond to each other (Fig. 5 (d)). As a result, the force F acts, which elastically pushes back the clamping lever shaft 17 and pushes it in the direction of the center point N of the needle shaft 15- of the center point P of the clamping lever shaft 17-, and the sewing machine needle 3 is fixed in a stable manner by the needle holder spring 23. The stable clamping state is maintained in this positional relationship. As shown in Fig. 4 (d), the sewing machine needle 3, the needle holder 5 and the clamp lever 19 are dimensioned so that the straight line L1 connecting the center C of the engaging surface 21b of the clamp arm 21 and the center P of the clamp lever shaft 17 is the straight line Line L2 corresponds to connecting the center point N of the needle shaft 15 of the sewing machine needle 3 and the center point P of the clamp lever shaft 17 with each other. Moreover, it can be expressed differently in the following way: In this state of the needle shaft 15 of the sewing machine needle 3, the clamp lever shaft 17 of the needle holder 5 and the clamp arm 21 of the clamp lever 19, the distance L1, the center C of the engaging surface 21b of the clamp arm 21 and the center P of the clamp lever shaft 17 correspond to each other connects, the distance L2 connecting the center point N of the needle shaft of the sewing machine needle and the center point P of the clamp lever shaft. This means that: L1 = L2 (Fig. 5 (d)).
    As for the above-mentioned clamping device for a sewing machine needle 1, it occurs when the sewing machine needle is clamped, due to the frequent engagement between the surface of the needle shaft 15 in which the name of the manufacturer of the sewing machine needle 3 and the engraving mark are engraved, and the convex part of the force locking part 22 of the clamp arm 21 and surface friction with each other due to the difference between the materials of the two at the time of engagement, and ultimately there is a possibility that the sewing machine needle 3 cannot be securely clamped to the needle holder 5.
    As for the clamping device for a sewing machine needle 1 of the present invention, the needle holder 5 has, as a prerequisite to remedy the above-mentioned shortcomings, as mentioned above, a clamping lever 19 for the recessed receiving part 7, which can be freely opened and closed and which is attached to the Clamping lever shaft 17 which is pivotally mounted in the elongated hole 13b drilled in the mounting portion 13a provided in the mounting base 13 of the needle holder 5 from top to bottom. The clamp lever 19 has a clamp arm 21 which moves around the peripheral surface of the needle shaft 15 of the sewing machine needle 3 without touching it. The clamping arm 21 has the force-acting locking part 22 which moves against the elasticity of the needle holder spring 23 around the needle shaft 15 of the sewing machine needle 3 without touching it when the clamping lever 19 is in the state in which the needle shaft 15 of the sewing machine needle 3 is in engagement with the recessed receiving part 7 and rests against the fastening position 7b (FIG. 2 (a)) in the vertical direction, is pivoted in a clamping direction "a" (FIGS. 4 (b) to 4 (d), FIGS. 5 (a) to 5 (d)) which passes the branch point position tp (Fig. 5 (c)) where the elasticity of the needle holder spring 23 becomes maximum, and which maintains the stable clamping state by the elasticity of the needle holder spring 23.
    Further, as shown in Figs. 4 (a) to 4 (d), 5 (a) to 5 (d), in the clamping device for a sewing machine needle of the present invention, a cam 71 is in the Needle holder 5 provided; a cam follower 70 engaging with the cam 71 is provided in the clamp arm 21, the elongated hole 13b is formed in the shape of a deformed elongated hole and has three surfaces 13d, 13e, 13f on which the cam follower 70 overcomes the cam 71 and acts as a moving path of the clamp lever shaft 17 which becomes the center of rotation P of the clamp lever 19 (Fig. 5 (e)). The center point P of the clamping lever shaft 17 follows the centers P1, P2, P3 inside the deformed elongated hole 13b. The three surfaces 13d, 13e, 13f are located between arcuate surfaces 13g, 13h, 13i, which have the same diameter as the radius “r” of the clamping lever shaft 17. In this way, the deformed elongated hole 13b is formed by the three surfaces 13d, 13e, 13f and the inner peripheral surfaces of the arcuate surfaces 13g, 13h, 13i. Depending on the closing of the clamping lever 19 and according to the engagement between the cam follower 70 and the cam 71 and the elastic repulsion of the needle holder spring 23, the center point P of the clamping lever shaft 17 passes the center points P1, P2 inside the deformed elongated hole 13b and reaches a neighborhood of the center P3, reaching the center P3 when the needle shaft 15 of the sewing machine needle 3 is not mounted in the recessed receiving part 7 of the needle holder 5; on the other hand, the clamping lever shaft 17 is designed to follow the three surfaces 13d, 13e, 13f as a movement path. In addition, depending on the opening of the clamping lever 19, the center point P of the clamping lever shaft 17 moves the center points P3, P2, P1 inside the deformed elongated hole 13b in the opposite direction.
    In this case, the above force locking part 22 passes, and the branch point position tp at which the elasticity of the needle holder spring 23, which maintains the stable clamping state by the elasticity of the needle holder spring 23, becomes maximum, is a contact point between the cam follower 70 and the cam 71 when the center point P3 in the elongated hole 13b and the center point P of the clamp lever shaft 17 coincide. In order to enable the clamping lever shaft 17 to move smoothly, however, in practice the center point P3 has a certain play L3 starting from the center point P in the direction of the straight line L2 which connects the center point N of the needle shaft 15 and the center point P of the clamping lever shaft 17 Center N on (Fig. 5 (c)).
    In this clamping device for a sewing machine needle 1, the following is to be noted: When the clamping lever 19 when clamping the sewing machine needle 3 starting from the state before the clamping of the sewing machine needle 3 on the needle holder 5b through the state immediately after the clamping of the sewing machine needle 3 on the needle holder 5 to the state after continuing The further clamping of the sewing machine needle 3 on the needle holder 5 swings, namely as a path of movement of the clamping lever shaft 17, which becomes the centers of rotation P1, P2 of the clamping lever 19 of the elongated hole 13b, the clamping lever shaft 17 moves the two surfaces 13d, 13e (Fig. 5 (a), Fig. 5 (b), Fig. 5 (c)), where the center points P1, P2 of the elongated hole 13b, at which the cam follower 70 overcomes the cam 71, are radii of curvature, and on the other hand, since the cam follower 70 of the clamping arm 21 engages with the cam 71 of the needle holder 5 (Fig. 4 (a), 4 (b), 4 (c)) and moves, contacting the needle shaft 15 of the sewing machines adel 3 and the clamping arm 21 do not correspond to each other, and in the state in which the clamping of the sewing machine needle 3 on the needle holder 5 is completed, the elongated hole 13b reaches the surfaces 13d, 13e, 13f (Fig. 5 (a), 5 (b), 5 (c), 5 (d)) at which the cam follower 70 overcomes the cam 71 and moves as the moving path of the clamp lever shaft 17 which becomes the center of rotation P3 of the clamp lever 19, and comes into close engagement with the needle shaft 15 of the sewing machine needle 3 and the clamp arm 21.
    As for this clamping device for a sewing machine needle 1, this device has the basic merits that the mechanism is simplified and the operation is carried out by a small number of one-time touches and that the needle of a sewing machine such as a lockstitch sewing machine, an overcasting machine , a double chainstitch sewing machine or a cover stitch sewing machine can be firmly and easily attached, fixed or exchanged to the needle holder, andIn addition to the above basic advantages, it is achieved that when the sewing machine needle is clamped, the wear due to the frequent engagement between a surface of the needle shaft in which the name of the manufacturer of the sewing machine needle and an engraving mark are engraved, and a surface of the force-acting locking part of the clamping arm prevented and that the sewing machine needle can be securely clamped to the needle holder.
    Further, as shown in Figs. 6 (a) to 6 (d), in the clamping device for a sewing machine needle 1 of the present invention, a locking piece 72 is provided in the needle holder 5, which is movable in the direction perpendicular to the direction of Axis of the sewing machine needle 3, and a locking piece stopper 73 which guides the locking piece 72 in the direction perpendicular to the direction of the axis of the sewing machine needle 3 is provided. A clamp stopper 74 that prevents the clamp lever 19 from being opened by being locked to the lock piece 72 when the clamp lever 19 is closed is provided in the clamp lever 19, and a lock release button 75 that is slidably housed in the clamp lever 19 and releases the lock of the lock piece 72 and the clamp stopper 74 when the clamp lever 19 is opened is provided in the clamp lever 19. The lock piece 72 is urged to the clamping side by a coil spring 72a.
    When the clamp lever 19 is placed in the clamped position, the lock piece 72 is locked to the clamp stopper 74, and the clamp lever 19 cannot be released (Figs. 6 (a) to 6 (b)). The lock piece 72 is released from the lock stop 74 by pressing the lock release button 75 on the lever and the clamp can be opened (Figures 6 (c) through 6 (d)).
    As for the clamping device for a sewing machine needle 1 of the present invention, in addition to the above basic merits, when the clamping lever 19 is closed, it happens that the clamping lever 19 by an unintentional movement of the sewing machine needle 3 in the lateral direction and / or is opened in a forward and backward direction and there occurs a failure that the clamping fixation of the needle is released, which device can serve as a safety device that prevents the sewing machine needle 3 from being broken and scattered by the collision with other parts.
    Further, as to the sewing machine needle clamping device 1 of the present invention that fixes the sewing machine needle 3 to the recessed receiving portion 7 of the needle holder 5, as shown in Figs , the outer shape of the needle shaft 15 of the sewing machine needle, in particular, it has the inner shape 77 which is set on a shaft cone 76 in order to prevent the sewing machine needle from slipping out of the needle holder 5 when the sewing machine needle 3 penetrates a fabric used for a cloth bag For example, if there is a PVC or PU coating on the fabric, or if it penetrates leather that is difficult to pierce with the needle, in other words, if the sewing machine needle 3 penetrates a fabric that has a strong friction and the sewing machine needle 3 then emerges from the fabric.
    When the sewing machine needle 3 penetrates a fabric that is difficult to pierce by the needle and the sewing machine needle 3 subsequently exits the fabric, a force generally acts in one direction so that it becomes one by the force of friction with the fabric Slipping out of the needle holder 5 comes. Although the inner shape 77 of a conical groove with the approximate shape of the shank cone 76 of the sewing machine needle 3 is provided on an outlet side of a needle mounting groove of the needle holder 5, it is a conical shape which has sufficient play so that a time position in which a needle eye position passes through a needle thread detects a loop gripping point of the lower looper has no effect even if the sewing machine needle 3 moves in the direction of slipping out.
    As for the clamping device for a sewing machine needle 1 of the present invention, in addition to the above basic merits, when the sewing machine needle penetrates a fabric that is difficult to pierce by the needle, in other words, when the sewing machine needle enters a If a fabric which has strong friction penetrates and the sewing machine needle then comes out of the fabric, this device can prevent the sewing machine needle from slipping out of the needle holder by the force of the friction with the fabric.
    Further, as to the sewing machine needle clamping device 1 of the present invention, as shown in Figs. 8 (a), 8 (b), in the needle holder 5 that fixes the sewing machine needle 3, an L-shaped spring is provided to prevent the needle 78 from being forgotten, which urges the sewing machine needle 3 elastically in the direction in which the sewing machine needle 3 is separated from the recessed receiving part 7 when the clamping lever 19 is opened.
    As mentioned above, since the inner shape 77 of the conical groove with the approximate shape of the shaft cone 76 of the sewing machine needle 3 is provided as a cone to prevent the needle from slipping out on the outlet side of the needle mounting groove of the needle holder 5, the sewing machine needle 3 does not fall out when the Sewing machine needle 3 is attached to the needle holder 5. Therefore, there is a possibility that the clamping operation will be forgotten. If the clamping operation is not performed, the sewing machine needle 3 falls out because the sewing machine needle 3 is ejected in the direction away from the tapered groove by elastically pushing the sewing machine needle 3 from a rear side of the sewing machine needle 3.
    With regard to the clamping device for a sewing machine needle 1 of the present invention, in addition to the above basic advantages, a safety device is provided which ensures that the sewing machine needle 3 does not fall when the sewing machine needle 3 is attached to the needle holder 5. On the other hand, the clamping is prevented from being forgotten because the sewing machine needle 3 falls out of the receiving recessed part 7 when the clamping lever 19 is opened.
    As shown in Figs. 9 (a) to 9 (g), in the clamping device for a sewing machine needle 1 of the present invention, the needle holder 5 that fixes the sewing machine needle 3 is constructed so as to be able to lock the sewing machine needle 3 At the time of attachment direction of the sewing machine needle 3, in which the attachment hole 80 is formed, which is set to a D-shaped cross-sectional shape 79 including the flat attachment surface 15a of the upper end of the needle shaft 15 of the sewing machine needle 3, and in which the flat attachment surface 15a of the needle shaft 15 is attached to the flat mounting surface 7a of the recessed receiving part 7. In addition, when the upper end of the needle shaft 15 of the sewing machine needle 3 is not inserted into the mounting hole 80 which has a shape set to the D-shaped cross-sectional shape 79 including the flat mounting surface 15a, the sewing machine needle 3 at this point cannot be with the receiving part recessed 7 because the shank cone 76 of the sewing machine needle 3 does not fit into the portion of the inner shape 77 of the needle holder 5 (Figs. 9 (e) to 9 (g)).
    That is, in the direction of attachment of the sewing machine needle 3, the shaft surface corresponds to the needle holder body side. In the attachment hole 80 of the needle holder 5, since the portion where the upper end of the needle shaft 15 enters has the D-shaped cross-sectional shape 79, in the event that the needle shaft 15 is not in the normal direction, the sewing machine needle 3 cannot be fitted into the attachment hole 80 as mentioned above , and the force-acting locking part (clamping tip) 22 also cannot overcome the needle shaft 15, whereby the clamping operation cannot be performed.
    However, when the direction of the flat mounting surface 15a of the needle shaft 15 of the sewing machine needle 3 is the position shown in Figs. 9 (a) to 9 (e), the tip 21a of the clamp arm overcomes the needle shaft 15 even in the event that that the needle shaft 15 of the sewing machine needle 3 is not fitted into the fastening hole 80 and is not fitted into the flat fastening surface 7a of the receiving recessed part 7 of the needle holder 5 and is driven up when the play L3 increases. Therefore, the game L3 should be made small.
    As for the sewing machine needle clamping device 1 of the present invention, in addition to the above basic merits, the sewing machine needle can be attached to the recessed receiving part only when the needle is attached in the direction in which the flat Attachment surface of the needle shaft is attached to the flat attachment surface of the recessed receiving part, whereby the attachment can be performed safely.
    As apparent from the foregoing, the clamping device for a sewing machine needle of the present invention eliminates the need for the operation in which the thin sewing machine needle is screwed to the small-volume needle holder with a screwdriver through the screw, and the mechanism is simplified , the process being carried out by a small number of one-time touch operations, whereby the needle of a sewing machine such as a lockstitch sewing machine, an overcasting machine, a double chainstitch sewing machine or a cover stitch sewing machine can be firmly and easily attached, fixed or exchanged to the needle holder, and if with the clamping lever closed the clamping lever is opened by an unintentional movement of the needle in a lateral direction and / or in a forwards and backwards direction and the error occurs that the clamping fastening of the needle is loosened, this device can It serves as a safety device that prevents the sewing machine needle from being broken and scattered by collision with other parts, and when the sewing machine needle enters a fabric that is difficult to pierce by the needle, in other words, when the sewing machine needle enters a fabric , which has strong friction, and the sewing machine needle then comes out of the fabric, this device can prevent the sewing machine needle from slipping out of the needle holder due to the force of the friction with the fabric, and a safety device is provided to ensure that the Sewing machine needle does not fall out when the needle is attached to the needle holder. On the other hand, when the clamping lever is opened, the clamping can be prevented from being forgotten because the sewing machine needle falls out of the recessed receiving part, and the sewing machine needle can only be connected to the recessed receiving part when the sewing machine needle is attached in the direction in which the flat attachment surface of the needle shaft is attached to the flat attachment surface of the recessed receiving part, whereby the attachment can be performed securely.
    INDUSTRIAL APPLICABILITY
    Since the sewing machine needle can be firmly and easily attached and fixed to the needle holder, the clamping device for a sewing machine needle according to the present invention can be suitably applied to various types of sewing machines such as a lockstitch sewing machine, an overcasting machine, a double chainstitch sewing machine or a deck stitch sewing machine.
    EXPLANATION OF REFERENCE SIGNS
    1 clamping device for a sewing machine needle 3 sewing machine needle 5 needle holder 7 recessed receiving part 7a flat fastening surface 9 screw 11 cylindrical fastening section 13 fastening base 13a fastening section 13b elongated hole 13c fastening section with vertical direction 13d, 13e, 13f surface 15 needle shaft 15a flat fastening surface 17 clamping lever shaft 19 clamping lever 21 Clamp arm 21a Tip of the clamp arm 21b Engaging surface 22 Force action locking part 23 Needle holder spring 27 Screw 40 Hemstitch sewing machine (overcasting machine) 42 Throat plate 44 Looper as loop catching device 46 Lower shaft 48 Belt pulley of the lower shaft 50 Drive belt 52 Belt pulley of the upper shaft 54 Upper shaft 56 Needle bar drive mechanism 58 Needle bar 70 Cam follower 71 Cams 72 Locking piece 73 Locking piece stopper 74 Clamping stopper 75 Locking release button 76 Outer shape (shaft cone) 77 Inner shape 78 Spring to prevent forgetting d es clamping the needle 79 D-shaped cross-sectional shape 80 mounting hole a clamping direction L1 straight line distance connecting the center point of the engagement surface of the clamp arm and the center point of the clamp lever shaft L2 straight line distance connecting the center point of the needle shaft and the center point of the clamp lever shaft L3 clearance between P3 and PC center of the engaging surface of the clamp arm N center of the needle shaft P center of the clamp lever shaft P1, P2, P3 center tp branch point position
    权利要求:
    Claims (5)
    [1]
    1. A needle clamping device (1) for a sewing machine needle for fastening the sewing machine needle (3), characterized in that it comprises:a recessed receiving part (7) that receives a needle shaft (15) of the sewing machine needle (3) by attaching a flat attachment surface (15a) formed on the needle shaft (15) to a lower portion of the recessed receiving part (7),a pivotable clamping lever (19) which has a clamping arm (21) which engages the needle shaft (15) of the sewing machine needle and can be freely opened and closed for the recessed receiving part (7) and is fastened to a clamping lever shaft (17), which is loosely fitted in an elongated hole (13b) drilled in a mounting base (13) of the needle clamp device (1), anda needle holder spring (23) which elastically urges the clamp lever (19) by deflecting the needle holder spring (23) in an outer direction of a straight line that defines a center point of the needle shaft (15) in the assembled state of the sewing machine needle (3) and a center point of the clamp lever shaft (17) connects to each other, whereinthe clamping arm (21) has a force-acting locking part (22),which moves in the assembled state of the sewing machine needle around a circumferential surface of the needle shaft (15) of the sewing machine needle against the elasticity of the needle holder spring when the clamping lever (19) in the state in which the needle shaft (15) of the sewing machine needle (3) is in engagement with the recessed receiving part (7) and rests on a fastening position in the vertical direction, is pivoted in a clamping direction,wherein the force acting locking part (22) passes a branch point position (tp) at which the elasticity of the needle holder spring (23) becomes maximum, andwhich maintains a stable clamping state due to the elasticity of the needle holder spring (23),and a cam (71) is provided,and a cam follower (70) engaging with the cam (71) is provided on the clamp arm, andthe elongated hole (13b) has three flat surfaces (13d, 13e, 13f) as a path of movement, on which the clamping lever shaft (17) moves while the clamping lever (19) opens and closes.
    [2]
    2. Needle clamping device according to claim 1, characterized in that:a locking piece (72) is provided which is movable in a direction perpendicular to a direction of an axis of the needle, and a locking piece stopper (73) is provided which guides the locking piece in a direction perpendicular to a direction of an axis of the Sewing machine needle (3) isa clamping stopper (74) is provided on the clamping lever, which prevents the opening of the clamping lever (19) by locking the clamping lever on the locking piece when it is closed, anda lock release button (75) is provided on the clamp lever which releases the lock of the lock piece and the clamp stopper when the clamp lever is opened.
    [3]
    3. needle clamping device according to claim 1 or 2, whereinthe needle clamping device is designed with an inner shape (77) as a conical groove which is adapted to the needle shaft (15) or an outer shape of the needle (3) in order to prevent the needle (3) from slipping out of the needle clamping device when the needle penetrates a fabric and when the needle subsequently comes out of the fabric.
    [4]
    4. needle clamping device according to claim 3, characterized in that:a spring (78) for preventing the needle from being jammed is provided which elastically urges the needle in a direction in which the needle is separated from the recessed receiving part (7) when the clamp lever is opened.
    [5]
    5. Needle clamping device according to claim 1 or 3, characterized in that:the attachment base (13) comprises an attachment hole (80) having a D-shaped cross-sectional shape including a flat attachment surface (15a) for an upper end of the needle shaft of the sewing machine needle to be able to attach the sewing machine needle when the attachment surface (15a) of the needle shaft (15) is attached to the flat mounting surface of the recessed receiving part (7) in the needle clamp.
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    同族专利:
    公开号 | 公开日
    TW201912872A|2019-04-01|
    US10676848B1|2020-06-09|
    US20200190716A1|2020-06-18|
    DE112017001950T5|2019-04-18|
    AU2017430010A1|2019-08-29|
    JPWO2019043785A1|2020-08-06|
    KR102245972B1|2021-04-28|
    CN109923255B|2021-05-25|
    CN109923255A|2019-06-21|
    WO2019043785A1|2019-03-07|
    KR20200042369A|2020-04-23|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/JP2017/030923|WO2019043785A1|2017-08-29|2017-08-29|Sewing machine needle clamp device|
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