JP2007075223A - Looper device of chain-stitch sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the reliability by suppressing the wear of gears in a looper drive system and making assembling and controlling easy. <P>SOLUTION: A looper device 25 has: a looper shaft 40 holding a looper 12 so as to be able to integrally rotate; a key 49 rotatably and vertically movably supporting the looper shaft 40 on a looper support body 11, with a driven gear 48 being passed on the outer periphery of the looper shaft 40 relatively movably in a vertical direction, and coupling the driven gear 48 and the looper shaft 40 integrally rotatably; a bearing 50 holding the driven gear 48 to the looper support body 11 without permitting movement in a vertical direction; a pin 51 stopping the rotation of the looper 12 in a lowered position relative to the looper support body 11; a driving gear 39 mutually meshing with the driven gear 48 in a predetermined position in a vertical direction relative to the looper support body 11; and a motor 36 rotating the driving gear 39. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a looper device for a chain stitch sewing machine.

Conventionally, a plurality of loopers are arranged on the looper support, the looper support is moved in the arrangement direction of the looper, one looper is positioned and raised on the hook needle, and the looper and the hook needle cooperate with the work cloth. A chain stitch sewing machine that forms a ring stitch is known. Patent Document 1 and Patent Document 2 describe a looper device equipped in this type of chain stitch sewing machine. As shown in FIG. 6, in the looper device 60 of Patent Document 1, a looper 61 is fixedly held at the upper end of a looper shaft 62, and the looper shaft 62 is supported by a looper support 63 so as to be rotatable and vertically movable. Yes. The looper 61 is integrally provided with a driven gear 64. When the looper 61 is raised, the driven gear 64 is engaged with the drive gear 65, and when the looper 61 is lowered, the driven gear 64 is disengaged from the drive gear 65. Yes.
JP 2004-290372 A Japanese Patent No. 3579801

  However, according to the conventional looper device 60, the driven gear 64 is integrally provided on the looper 61, so that the driven gear 64 and the drive gear 65 repeatedly engage and disengage as the looper 61 moves up and down. For this reason, the gears 64 and 65 are worn out at an early stage, and it takes time to assemble and adjust, and troubles are likely to occur.

  An object of the present invention is to provide a looper device for a chain stitch sewing machine that solves the above-described problems, suppresses gear wear, facilitates assembly adjustment, and increases reliability.

  In order to solve the above problems, the looper device of the present invention has a plurality of loopers arranged on the looper support, moves the looper support in the direction of the looper arrangement, and positions one looper on the hook needle and moves up. In the chain stitch sewing machine that forms an annular seam on the work cloth by the cooperation of the looper and the heel needle, the loop stitcher is provided with a looper shaft that holds the looper so as to be integrally rotatable. A coupling member that connects the driven gear and the looper shaft so as to be rotatable together, and a driven gear that is vertically movable with respect to the looper support body. A holding member that holds immovable, a lock member that prevents the lowered looper from rotating against the looper support, and a driven gear at a fixed position in the vertical direction with respect to the looper support. A drive gear meshing, characterized in that a motor for rotating the driving gear.

Here, the following configuration can be adopted as means for moving the looper support in the direction in which the loopers are arranged.
(1) A gear having a diameter larger than that of the driven gear is used as a drive gear, and a plurality of loopers are all disposed at a lowered position, and are locked to a looper support by a lock member. Moving the looper support in the direction of the looper arrangement by sequentially meshing the driven gear with the drive gear. In this way, there is an advantage that one drive gear can be used for both the rotation of the looper and the movement of the support.
(2) A long shaft is coupled to the looper support in the arrangement direction of the looper, the shaft is connected to a linear motion actuator, and the looper support is moved in the looper alignment direction via the shaft by the linear motion actuator.

  According to the looper device of the present invention, the driven gear is held so as not to move up and down with respect to the looper support, and the drive gear is engaged with the driven gear at a fixed position in the vertical direction with respect to the looper support. There is no relative movement in the vertical direction. For this reason, there is an excellent effect that gear wear can be suppressed, assembly adjustment can be facilitated, and reliability can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, this chain stitch sewing machine M has a plurality of loopers 12 arranged on a looper support 11, the looper support 11 is moved in the arrangement direction of the looper 12, and one looper 12 is attached to the heel needle 4. After positioning and raising, an annular seam is formed on the work cloth by the cooperation of the looper 12 and the heel needle 4. As shown in FIG. 3, the looper device 25 includes a looper shaft 40 that holds the looper 12 so as to be integrally rotatable. The looper shaft 40 is supported on the looper support 11 so as to be vertically movable and rotatable. The driven gear 48 is inserted into the outer periphery so that the relative movement in the vertical direction is possible, the coupling member 49 that couples the driven gear 48 and the looper shaft 40 so as to be integrally rotatable, and the driven gear 48 cannot be moved up and down with respect to the looper support 11. A holding member 50, a lock member 51 that prevents the looper 12 in the lowered position from rotating against the looper support 11, a drive gear 39 that meshes with the driven gear 48 at a fixed position in the vertical direction with respect to the looper support 11, and a drive And a motor 36 that rotates the gear 39.

  Next, an embodiment in which the present invention is embodied in a chain stitch sewing machine for embroidery processing will be described with reference to FIGS. First, the overall configuration of the chain stitch sewing machine will be outlined. As shown in FIG. 1, the chain stitch sewing machine M is configured as a multi-head type in which a plurality of heads 2 are mounted on the upper frame 1 of the machine frame. A needle bar 3 is supported on each head 2 so as to be movable up and down, and a barb needle 4 is attached to the lower end of the needle bar 3. The needle bar 3 is connected to a motor 6 through a main shaft 5 common to all heads 2, and the needle 4 is driven up and down as the motor 6 rotates.

  A table 8 is disposed below the head 2, and the same number of beds 10 as the head 2 are installed on an intermediate frame 9 below the table 8. A looper support 11 is provided on the front surface of each bed 10 so as to be movable in the left-right direction. Six loopers 12 (see FIG. 2) and a yarn feeding apron 13 are provided on the support 11. A thread stand 18 is provided on the lower frame 17 below the bed 10, and a spool 19 is arranged on the thread stand 18.

  Each thread spool 19 is wound with a thread T of a different color and supplied to the looper 12 via a thread guide 20, a thread tension 21, and thread guides 22 and 23. Then, the looper support 11 is moved in the direction in which the loopers 12 are arranged, and one looper 12 is positioned on the heel needle 4, and the work cloth on the table 8 is formed of an annular stitch by the cooperation of the looper 12 and the heel needle 4. A multicolored embroidery pattern is sewn.

  Next, the configuration of the looper device 25 will be described with reference to FIGS. A bed cover 26 covering the upper surface of the bed 10 is attached to the table 8, a needle plate 28 having a needle hole 27 is provided on the cover 26, and the looper support 11 is disposed below the needle plate 28. . A looper cover 29 is attached to the upper end surface of the looper support 11, and a through hole 30 in which the looper 12 appears and disappears is formed in the cover 29. A slider 31 is attached to the rear surface of the looper support 11, and a rail 32 fitted to the slider 31 is fixed to the front surface of the bed 10 so as to extend left and right.

  A thread trimming base 33 is installed on the upper surface of the bed 10, and a thread trimming device 35 having a knife 34 is installed on the base 33. Inside the bed 10, a looper drive motor (servo motor) 36 and a female drive motor (pulse motor) 37 are arranged side by side. A large-diameter drive gear 39 is supported on the output shaft 38 of the looper drive motor 36.

  The looper 12 is fixed to the upper end of a hollow looper shaft 40, and the looper shaft 40 is supported in a vertical hole 41 of the looper support 11 through a guide 42 so as to be movable up and down. The looper 12 is formed with a needle drop hole 43 into which the lower end of the saddle needle 4 is inserted and a notch 44, and a sewing thread T is inserted into the looper shaft 40 from the lower end of the looper shaft 40 through the needle drop hole 43 and the through hole 30. It is pulled out above the looper cover 29.

  A bearing 45 is inserted into the lower end portion of the looper shaft 40, and a compression spring 46 that biases the looper shaft 40 downward is interposed between the bearing 45 and the looper support 11. An elevating body 47 is disposed below the bearing 45, and when the elevating body 47 is driven by a looper elevating motor (not shown), the single looper shaft 40 indexed to the sewing position is connected to the compression spring 46. The looper 12 is pushed up against the urging force, and the looper 12 on the looper shaft 40 is disposed at a rising position (a chain line position in FIG. 3) approaching the lower surface of the needle plate 28.

  Below the looper 12, a driven gear 48 is inserted in the outer periphery of the looper shaft 40 so as to be capable of relative movement in the vertical direction, and is coupled to the looper shaft 40 by a key 49 so as to be integrally rotatable. A pair of upper and lower bearings 50 that rotatably support the driven gear 48 are mounted on the looper support 11, and the driven gear 48 is held by the two bearings 50 so as not to move up and down with respect to the looper support 11.

  On the other hand, at the position facing the lower end of the looper 12, six pins 51 that fit into the notches 44 of the looper 12 are fixed to the looper support 11. The five loopers 12 other than the sewing position are arranged at the lowered position (solid line position in FIG. 3) by the urging force of the compression spring 46, and are prevented from rotating with respect to the looper support 11 by the fitting of the pin 51 and the notch 44. ing.

  As shown in FIG. 3, the drive gear 39 is formed to have a larger diameter than the driven gear 48, and is meshed with the driven gear 48 of the looper 12 indexed to the sewing position at a fixed position in the vertical direction with respect to the looper support 11. . Then, the looper 12 at the sewing position is rotated by the looper drive motor 36, and the sewing thread T is hooked on the heel needle 4 that has entered the needle drop hole 43. Further, by rotating the drive gear 39 in a state where all the six loopers 12 are arranged at the lowered position and are prevented from rotating by the pins 51, the driven gears 48 are sequentially meshed with the drive gear 39, and the looper support 11 Is configured to be movable in the direction in which the loopers 12 are arranged.

  According to the looper device 25 configured as described above, the driven gear 48 is held so as not to move up and down with respect to the looper support 11, and the drive gear 39 is engaged with the driven gear 48 at a fixed position in the vertical direction with respect to the looper support 11. Thus, no relative movement in the vertical direction occurs between the driven gear 48 and the drive gear 39. For this reason, wear of the gears 39 and 48 is suppressed, assembly adjustment is facilitated, and the looper device 25 can be operated in a stable state for a long time.

In addition, this invention is not limited to the said embodiment, For example, it can also be suitably changed and embodied as follows, for example in the range which does not deviate from the meaning of invention.
(1) As shown in FIG. 5, a notch 53 is formed at the lower end of the looper shaft 40, a pin 54 is provided on the lower side of the looper support 11, and the looper in the lowered position is fitted by the pin 54 and the notch 53. 12 is prevented from rotating with respect to the looper support 11.
(2) The thread trimmer of the present invention is applied to a single-head chain stitch machine.

1 is an overall view of a chain stitch sewing machine showing an embodiment of the present invention. It is a top view which shows the looper apparatus of this chain stitch sewing machine. It is sectional drawing of this looper apparatus. It is a top view which shows the effect | action of the drive gear of this looper apparatus. It is sectional drawing which shows the example of a change of a looper apparatus. It is sectional drawing which shows the conventional looper apparatus.

Explanation of symbols

4 Acupuncture needle 11 Looper support 12 Looper 25 Looper device 36 Looper drive motor 39 Drive gear 40 Looper shaft 48 Driven gear 49 Key 50 Bearing 51 Pin M Ring stitch machine T Sewing thread

Claims (1)

A plurality of loopers are arranged on the looper support, the looper support is moved in the direction of the looper arrangement, one looper is positioned and raised on the heel needle, and the looper and the heel needle cooperate to form a ring on the work cloth. In the chain stitch sewing machine that forms the eyes,
A looper shaft for holding the looper so as to rotate integrally is supported, the looper shaft is supported by a looper support so as to be movable up and down and rotatable, and a driven gear is inserted into the outer periphery of the looper shaft so as to be capable of relative movement in the vertical direction. A coupling member that couples the driven gear and the looper shaft so as to be integrally rotatable, a holding member that holds the driven gear so as not to move up and down with respect to the looper support, and a lock member that prevents the looper in the lowered position from rotating relative to the looper support. And a drive gear that meshes with the driven gear at a fixed position in the vertical direction with respect to the looper support, and a motor for rotating the drive gear.

Images