KR101170841B1 - Looper drive device - Google Patents

Abstract

     It is almost orthogonal to the vertical movement direction of the needle, has a shaft center in the conveying direction of the to-be-sealed material, and a looper rod 12 is provided at the tip of the looper shaft 11 and the looper shaft 11 provided over the sewing bed and the cylinder bed. The looper drive device which has the looper 13 provided in the upper side, and oscillates around the shaft center in the axial center direction by oscillating the looper shaft 11 in synchronism with the needle which moves up and down by rotation of the main shaft 15, The looper shaft 11 has a single shaft center over its entire length, and a looper swinging arm 20 for swinging the looper shaft 11 is connected to the looper shaft 11 in the sewing bed. A pair of looper shaft collars 26, which sandwich the looper back and forth movement arms 24 for advancing and retreating 11) back and forth, are connected. Even when the main shaft rotates at high speed, the looper is smoothly operated in synchronization with the vertical movement of the needle without making noise during the sewing operation or rattling the looper shaft.

Description

Looper Drives {LOOPER DRIVE DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loop bed driving device of a cylindrical bed sewing machine that is suitably used for sewing operations such as cylindrical articles, such as sleeves or necks of shirts, leg portions of pants, and the like.

Generally, a looper for sewing a cylindrical sewing material, specifically, a flat seam stitch or double chain stitch sewing machine, has a needle at the bottom of the needle plate serving as a transfer surface of the sewing material. The looping of the needle thread formed on the rear side of the needle moving upwards at the time of exiting is carried out in synchronism with the vertical movement of the needle in the advancing operation along the rear side of this dropping position and the retracting operation along the front side of the dropping position. It catches and pulls out, it catches with the looper thread loop formed in its back side and the needle which moves downward between each needle thread at the time of exiting, and forms the needle stitch which the needle thread and the looper thread sewn on the back surface of the to-be-sealed object. That is, the looper has a long axis in a direction substantially orthogonal to the conveying direction of the sewing object and moves along an elliptical track of a predetermined width centered on a position where the needle falls, in a plane approximately orthogonal to the vertical movement of the needle. .

Sewing machines with such loopers are described, for example, in Chinese ionization publication 158836 and Chinese ionization publication 465596.

First, such a sewing machine 100 will be described with reference to FIGS. 7 to 9.

The sewing machine 100 is a sewing bed 102, a sewing arm 103 installed laterally extending from the upper end of the sewing bed 102, and positioned below the sewing arm 103 and are sewing from the sewing bed 102. It consists of a cylinder bed 104 extending in parallel with the arm 103, the needle rod 106, which is provided with a needle 105, is installed at the distal end of the sewing arm 103 so as to be movable up and down, and the pressing member ( The pressurizing shaft 108 provided with the 107 is pushed in an up-down direction, and is provided so that pressure adjustment is possible. The needle plate 109 is fixed to the tip of the cylinder bed 104 by a screw (not shown) corresponding to the needle 105 and the pressing member 107, and the cylinder cover 110 is detachable. Is installed. In addition, while the looper shaft 111 is arrange | positioned between the sewing bed 102 and the cylinder bed 104, although it is not shown in detail, the conveyance to which the to-be-sealed material was inserted in the slit of the needle plate 109 was carried out. The feed mechanism sent by the teeth in the base direction of the cylinder bed 104 (in the direction of the arrow in FIG. 7) is also provided in parallel with the looper shaft 111.

On the other hand, inside the cylinder cover 110, the tip of the looper shaft 111 protrudes beyond the tip of the cylinder bed 104, and the looper stand 112 and the looper stand 112 connected to the tip end of the looper shaft 111. The looper 113 provided in () is arrange | positioned.

Moreover, the main shaft (not shown) which connected the pulley 114 is pivotally supported by the sewing-bed 102, and the pulley 114 and the main shaft are rotated by the electric motor and the belt (not shown), Rotational torque is transmitted to the looper shaft 111 through a looper drive device (not shown) accommodated in the sewing bed 102 to swing the looper 113 around the looper shaft 111 and along the looper shaft 111. It is to move back and forth. At this time, the needle 105 moves up and down by the rotation of the main shaft, so that the looper 113 synchronizes with the up and down movement of the needle 105, and the oscillation around the position where the needle is separated and the elliptic orbit by the forward and backward movement To move the phase.

In addition, the looper shaft 111 is formed of a U-shaped connecting member 111b connected integrally to the shaft main body 111a and the base end of the shaft main body 111a, as shown in FIG. Is transmitted to the shaft main body 111a via the connecting member 111b.

By the way, in the above-mentioned cylindrical bed sewing machine, although the main shaft rotates about 3500 per minute, the high speed rotation of 4500 rotations or more per minute is calculated | required further. In the above-mentioned looper drive mechanism, when performing such a high speed rotation, the looper shaft is formed of the shaft main body and the U-shaped connecting member, and the rotational torque of the main shaft is transmitted to the shaft main body through the U-shaped connecting member. At this time, slight bending and torsion occur in the U-shaped connecting member, which is unsuitable for high-speed rotation, such as generating noise or rattling of the looper shaft during the sewing operation.

In addition, the back and forth motion of the looper shaft is increased by bending and deformation of the U-shaped connecting member, and thus the elliptical motion of the looper is expanded in the front and rear directions. As a result, the delicate crossing gap at the time of the cross of the needle and the looper was increased, and there was a fear of skipping of the stitches.

The present invention has been made in view of the above problems, and the looper driving device capable of smoothly operating the looper in synchronism with the vertical movement of the needle without noise or looper shaft rattles even when the spindle rotates at high speed. To provide.

The looper drive device of the present invention is substantially orthogonal to the vertical movement direction of the needle, has a shaft center in the conveying direction of the workpiece, and is provided via a looper rod provided at the tip of the looper shaft and a looper shaft provided over the sewing bed and the cylinder bed. A looper drive device having a looper, which swings the looper axis around an axis in synchronism with a needle moving up and down by the rotation of the main axis, wherein the looper axis has a single axis over its entire length. The looper pivot arm swinging the looper shaft is connected to the looper shaft in the sewing bed, and a pair of looper shaft collars sandwiching the looper back and forth motion arm for advancing and retreating the looper shaft forward and backward. It is characterized by. The looper back and forth movement arm may be provided with an operation unit for pressing the looper shaft collar. The actuating part may be constituted by a pair of configurations for sandwiching the looper shaft.

According to the present invention, the needle is moved up and down by rotating the main axis, while the looper shaft is swung around the axis by the looper swinging arm in synchronization with the up and down movement of the needle, and the retractor moves forward and backward in the axis direction by the looper back and forth motion arm and the looper shaft collar. Let's do it. Therefore, the looper is moved along the elliptical track of a predetermined width centered on the position where the needle falls, with the long axis as the direction substantially orthogonal to the conveying direction of the to-be-sealed material in the plane substantially orthogonal to the vertical movement of the needle.

Here, the looper shaft has a single shaft center over the entire length, and a looper swinging arm for swinging the looper shaft is connected to the looper shaft in the sewing bed, and a pair for pinching the looper back and forth movement arm for advancing and retreating the looper shaft in the forward and backward directions. The collar is connected so that the swing of the looper shaft due to the rotation of the main shaft and the forward and backward rotational movement in the axial direction thereof can be smoothly performed.

As a result, even when the main shaft rotates at high speed, the looper can be smoothly operated in synchronism with the vertical movement of the needle, without generating noise or rattling the looper shaft. Further, the back and forth motion of the looper shaft does not increase due to the bending and deformation of the U-shaped connecting member, and the elliptical motion of the looper does not extend in the front and rear directions. As a result, the delicate crossing gap at the time of the crossing of the needle and the looper does not increase, and it is possible to prevent the occurrence of skipping of the needle stitches.

In the present invention, when the angle member in contact with the looper shaft collar is pivotally supported on the looper forward and backward movement arm, each member is always in surface contact with the looper shaft collar when the looper forward and backward movement arm swings. The rocking motion of the looper back and forth motion arm can be transmitted reliably to the looper shaft collar, that is, the looper shaft.

According to the present invention, even when the main shaft rotates at a high speed, the looper can be smoothly operated in synchronism with the vertical movement of the needle without generating noise during the sewing operation or rattling the looper shaft. In addition, it is possible to prevent the occurrence of needle stitches and to improve the durability of the looper shaft.

1 is a perspective view showing a cylindrical bed sewing machine provided with a looper drive device of the present invention.

FIG. 2 is a perspective view of the looper drive device of FIG. 1. FIG.

3 is an exploded perspective view of the looper driving device of FIG. 2;

4 is a side view showing a part of the looper driving device of FIG.

5 is an exploded perspective view showing another embodiment of the looper driving apparatus with a part omitted.

FIG. 6 is a side view of the looper driving device of FIG. 5. FIG.

7 is a perspective view showing an example of a conventional cylindrical bed sewing machine.

8 is a cross-sectional view of the cylinder bed of FIG.

9 is an exploded perspective view showing a part of the looper driving device of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 shows a cylindrical bed sewing machine 1 with a looper drive device of the present invention.

As described above, this sewing machine 1 is also located at the lower side of the sewing bed 2, the sewing arm 3 provided laterally extending from the upper end of the sewing bed 2, and the sewing arm 3; It consists of a cylinder bed (4) installed extending in parallel with the sewing arm (3) from the bed (2), and the needle bar (6) having the needle (5) at the distal end of the sewing arm (3) is capable of vertical movement. It is provided, and the pressing shaft 8 in which the pressing member 7 was installed is installed in the up-down direction so that pressure adjustment is possible. The needle plate 9 is fixed to the tip of the cylinder bed 4 by a screw (not shown) corresponding to the needle 5 and the pressing member 7, and the cylinder cover 10 can be attached or detached. Is installed. In addition, while the looper shaft 11 (refer FIG. 2) is arrange | positioned on the cylinder bed 4 over the sewing bed 2, although it is not shown in detail, the to-be-sealed material is inserted in the slit of the needle plate 9 The feed mechanism which is sent in the fundamental direction (direction of the arrow in FIG. 1) of the cylinder bed 4 by the inserted feed tooth is also provided in parallel with the looper shaft 11.

Inside the cylinder cover 10, the tip of the looper shaft 11 protrudes beyond the tip of the cylinder bed 4, while the looper stand 12 and the looper stand 12 are connected to the tip end of the looper shaft 11. The looper 13 provided in this is arrange | positioned (refer FIG. 2).

Moreover, the main shaft 15 (refer FIG. 2) which connected the pulley 14 to the sewing bed 2 is pivotally supported rotatably, and is pulley 14, ie, via an electric motor and a belt (not shown). The rotational torque can be transmitted to the main shaft 15.

Here, the directions of the looper shaft 11 and the main shaft 15 are perpendicular to each other.

2 and 3, the looper swing eccentric ring 16 is screwed to the main shaft 15 in the sewing bed 2. The looper swing member 17 is rotatably fitted to the looper swing eccentric ring 16, and the looper joint 19 is rotatable through the connecting pin 18 at the distal end of the looper swing member 17. Pivotally supported. In addition, the looper swinging arm 20 having the ball 20a is fixed to the looper shaft 11 with the ball 20a by the screw, and the ball 20a of the looper swinging arm 20 is the looper swing described above. A ball joint is formed in the joint 19 and is connected.

Therefore, when the main shaft 15 rotates, the looper swing member 17 fitted to the looper swing eccentric ring 16 which rotates integrally with the main shaft 15 is the shaft center and the main shaft 15 of the looper swing eccentric ring 16. Raise in the vertical direction over a distance twice the eccentric distance from the shaft center. As the looper swing member 17 moves up and down, the looper swing joint 19 moves up and down, the looper swinging arm 20 moves up and down through the looper swing joint 19, and eventually the lifting range of the looper swinging arm 20. The looper shaft 11 can be swung around its axis.

In addition, the looper forward and backward movement eccentric ring 21 is screwed to the main shaft 15 at intervals in the axial direction from the above-described looper swing eccentric ring 16 in the sewing bed 2. And the looper back and forth movement member 22 is rotatably fitted in the looper back and forth motion eccentric ring 21, and the looper back and forth movement arm 24 is connected to the tip of the looper back and forth movement member 22 by the connecting pin 23. Is connected. That is, the other end of the connecting pin 23 whose one end is pivotally supported by the looper back and forth movement member 22 is inserted into the long hole 24a of the looper back and forth movement arm 24, and the connecting pin 23 is connected. The nut is screwed into and the fall of the looper back and forth movement arm 24 is prevented. In addition, the looper front and rear motion axis 25 is pivotally supported on the sewing bed 2, and the above-mentioned looper front and rear motion arm 24 is rotatably fitted to the looper front and rear motion axis 25. In the looper shaft 11, a looper shaft collar 26 into which the operating part 24b of the looper back and forth movement arm 24 is in contact with the sewing bed 2 is fitted, and is fixed with a screw.

In addition, in order to prevent the looper back and forth movement arm 24 from the looper back and forth movement axis 25, the looper back and forth movement arm 24 positioned on the looper back and forth movement axis 25 with respect to the looper back and forth movement axis 25. ), The looper back and forth movement shaft collar 27 which sandwiches) from the left and right is inserted, and it is fixed with the screw.

Therefore, when the main shaft 15 rotates, the axial center and main shaft of the looper back and forth movement member 22 fitted to the looper back and forth eccentric ring 21 which rotates integrally with the main shaft 15. Advancing forward and backward over the distance twice the eccentric distance from the axial center of (15). As the looper back and forth movement member 22 moves forward and backward, the looper back and forth movement arm 24 swings around the looper back and forth movement shaft 25, and the operating portion 24b is connected to the looper shaft 11. By pressurizing 26, the looper shaft 11 can be moved forward and backward in the axial direction over the swinging range of the looper back and forth motion arm 24.

Here, the connecting pins 18 pivotally supported by the looper swing member 17 and the connecting pins 23 pivotally supported by the looper back and forth movement member 22 are perpendicular to each other. In addition, the above-mentioned looper shaft 11 and the connecting pin 18 pivotally supported by the looper swing member 17 are parallel to each other.

On the other hand, as shown in Fig. 2, the looper shaft 11 is formed of a torque shaft having a single shaft center over its entire length, and supports the looper shaft 11 near the front end portion, the middle portion, and the rear end portion, respectively. The bush 28 (three parts in total) is provided.

Next, the operation of the looper driving device configured as described above will be described.

Rotational power is transmitted to the pulley 14 via an electric motor and belt (not shown), whereby the spindle 15 rotates, moves the needle 5 up and down, and is connected to the spindle 15 in the sewing bed 2. The looper swing eccentric ring 16 and the looper back and forth motion eccentric ring 21 are rotated, respectively, so that the looper swing member 17 fitted to the looper swing eccentric ring 16 is rotated and the shaft center and the main shaft 15 of the looper swing eccentric ring 16. Axial center and main shaft of the looper front and rear motion eccentric ring 21 by lifting and lowering in the vertical direction over a distance twice the eccentric distance from the shaft center, and fitted to the looper front and rear motion eccentric ring 21. Advancing forward and backward over the distance twice the eccentric distance from the axial center of (15).

The lifting and lowering of the looper swing member 17 raises and lowers the looper swing joint 19 connected to the looper swing member 17, and raises and lowers the looper swinging arm 20 connected to the looper swing joint 19. In this case, the looper swing arm 20 is integrally connected to the looper shaft 11, thereby allowing the looper shaft 11 to swing around the shaft center over the lifting and lowering range of the looper swinging arm 20.

Further, the advance and retraction of the looper forward and backward movement member 22 causes the looper forward and backward movement arm 24 connected to the looper forward and backward movement member 22 to swing around the looper forward and backward movement axis 25, so that the operating portion 24b of the looper shaft is rotated. The collar 26 is pressurized. In this case, since the looper shaft collar 26 is integrally connected to the looper shaft 11, the looper shaft 11 is moved in its axial direction over the swinging range of the operating portion 24a of the looper back and forth motion arm 24. You can move forward. Move on the elliptic orbit described above.

As the main shaft 15 rotates in this manner, the rotational torque is transmitted to the looper shaft 11 to swing the looper shaft 11 around the shaft center and to move back and forth in the shaft center direction. Therefore, the looper 13 provided at the tip of the looper shaft 11 through the looper stand 12 swings around the looper shaft 11, moves back and forth along the looper shaft 11, and moves up and down the needle 5. In synchronism with the movement, the oscillation around the position where the needle falls and the elliptical trajectory caused by the forward and backward movement are moved.

Here, since the looper shaft 11 has a single shaft center over its entire length, the swinging motion of the looper shaft 11 by the looper swinging arm 20 and the looper shaft 11 by the looper back and forth movement arm 24 are used. The retreat movement is smoothly performed without generating noise or rattling the looper shaft 11.

As a result, even when the main shaft 15 is rotated at high speed, the looper 13 can be smoothly operated in synchronization with the vertical movement of the needle 5 without generating noise or the looper shaft 11 rattles.

Further, the back and forth motion of the looper shaft does not increase due to the bending and deformation of the U-shaped connecting member, and the elliptical motion of the looper does not extend in the front and rear directions. As a result, the delicate crossing gap at the time of the crossing of the needle and the looper does not increase, and it is possible to prevent the occurrence of skipping of the needle stitches.

In addition, in the above-mentioned embodiment, the operation part 24b of the looper back and forth movement arm 24 is brought into direct contact with the looper shaft collar 26 connected to the looper shaft 11, and the swinging of the looper back and forth movement arm 24 is performed. Although the case where the motion is converted into the forward and backward motion of the looper shaft 11 has been described, as shown in FIGS. 5 and 6, the pins 29 for the respective members are placed on the operating portion 24b of the looper back and forth motion arm 24. Each member 30 may be rotatably pivoted, and each member 30 may be in contact with the looper shaft collar 26.

By adopting each of these members 30, it is possible to always make each member 30 contact with the looper shaft collar 26 at the time of the rocking motion of the looper back and forth movement arm 24, and the looper back and forth movement arm 24 The swinging motion of can be reliably transmitted to the looper shaft 11 via the looper shaft collar 26.

As described above, according to the present invention, the looper operates smoothly in synchronization with the vertical movement of the needle without noise or looping shafts during sewing operation even when the spindle rotates at high speed. High efficiency cylindrical bed sewing machines can be provided.

Claims (3)

It is substantially orthogonal to the vertical movement direction of the needle and has a axial center in the conveying direction of the to-be-sealed object, and includes a looper shaft provided over the sewing bed and the cylinder bed, and a looper provided at the tip of the looper shaft via a looper band. A looper drive device which swings a looper shaft around an axis center in synchronization with a needle moving up and down by rotation, and is advanced in an axis direction. The looper shaft has a single shaft center over its entire length, and a looper swinging arm for swinging the looper shaft is connected to the looper shaft in the sewing bed, and the front and rear pinching looper forward and backward movement arms for advancing and retracting the looper shaft forward and backward ( 루) a pair of looper shaft collars are connected, An actuating portion for pressing the looper shaft collar is provided on the looper back and forth movement arm, An angle member in contact with the looper shaft collar is pivotally supported on the looper forward and backward movement arm, A looper driving device, characterized in that each member is rotatably pivotally supported by an actuating portion of the looper forward and backward movement arm via a pin for each member to bring the respective members into contact with the looper shaft collar. delete The looper driving device according to claim 1, wherein the operating portion has a pair of configurations that sandwich the looper shaft.

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