KR20060106868A - Looper drive device - Google Patents

Abstract

A louver drive device, comprising a louver shaft (11) generally orthogonal to the direction of the vertical movement of a needle, having an axis in the feeding direction of a sewn material, and installed throughout a sewing machine bed and a cylinder bed and a louver (13) installed at the tip of the louver shaft (11) through a louver stand (12), wherein the louver shaft (11) is swung around its axis in synchronism with the needle vertically moved by the rotation of a spindle (15) and moved forward and backward in the axial direction. The louver shaft (11) has a single axis throughout its entire length, a louver swing arm (20) swinging the louver shaft (11) is connected to the louver shaft (11) in the sewing machine bed, and a pair of louver shaft collars (26) holding, from the front and rear sides, a louver longitudinal movement arms (24) longitudinally moving the louver shaft (11) are connected to the louver shaft (11). Even when a spindle is rotated at high speeds, the louver can be smoothly operated in synchronism with the vertical movement of the needle without generating noise and the rattling of the louver shaft in operating a sewing machine.

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.

In general, a looper for sewing a cylindrical sewing object, specifically, a flat sewing sewing machine or a double loop sewing sewing machine, moves downward along the rear side of the needle drop position at the bottom of the needle plate serving as the conveying surface of the sewing object. And the retracting operation along the front side of the position where the needle falls, in synchronism with the vertical movement of the needle, catching and pulling out the loop of the needle thread formed on the rear side of the needle moving upward at the time of exit, The loop is formed between the looper thread loop formed on the rear side of the needle thread and each needle thread by a downwardly moving needle, and the needle thread and the looper thread are formed on the back side of the sewing 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 having the needle 105 provided at the tip of the sewing arm 103 is installed to enable vertical movement, and at the same time, the pressing member The pressurizing shaft 108 provided with the 107 is provided in the up-down direction 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 fundamental 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 was pivotally rotated in the sewing-bed 102, and the pulley 114 and the main shaft are rotated by the electric motor and the belt (not shown), and the rotation is carried out. Torque is transmitted to the looper shaft 111 through a looper driving device (not shown) accommodated in the sewing bed 102, and swings the looper 113 around the looper shaft 111, and at the same time, the looper shaft 111. Will move back and forth along. 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, 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, and has a shaft center in the conveying direction of the workpiece, and is provided via a looper shaft 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, wherein the looper axis oscillates around the axis center in synchronism with a needle moving up and down by the rotation of the main shaft, and moves the looper axis in the axial direction. A looper swinging arm for swinging the looper shaft to the looper shaft in the sewing bed, and a pair of looper shaft collars sandwiching the front and rear looper arms for advancing and retreating the looper shaft in front and rear directions. will be.

According to the present invention, the needle is moved up and down by rotating the main axis, while the looper axis is oscillated around the axis by the looper swinging arm in synchronization with the up and down movement of the needle, and the advancing and retreating in the axis direction by the looper front and rear arms and the looper shaft collar. Let's do it. Therefore, the looper is moved along the elliptical orbit of a predetermined width centered on the position where the needle falls, in the plane substantially perpendicular to the vertical movement of the needle, with the long axis as the direction substantially orthogonal to the conveying direction of the workpiece.

Here, a pair of looper shafts having a single shaft center over the entire length and a looper oscillating arm for oscillating the looper shaft connected to the looper shaft in the sewing bed, and sandwiching the front and rear looper arms for advancing and retreating the looper shaft in the front and rear 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, if each member in contact with the looper shaft collar is pivotally pivoted on the front and rear arms of the looper, each member is always in surface contact with the looper shaft collar when the arm before and after the looper swings, thereby causing the swinging motion of the looper front and rear arms. Can be transferred to the looper shaft collar, ie 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. At the same time, the pressing shaft 8 provided with the pressing member 7 is installed in such a manner as to be pressurized in the vertical direction. 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 is attached and detached. It is possible to install. 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 rotatable, and pulley 14, ie, a main shaft, via an electric motor and a belt (not shown). Rotational torque can be transmitted to (15).

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

By the way, as shown in detail in FIG. 2 and FIG. 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 fitting 19 is pivotally rotatable by the connecting pin 18 at the distal end of the looper swing member 17. It is. 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 fitting port is formed in the fitting port 19 and 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 fitting port 19 moves up and down, and the looper swinging arm 20 moves up and down through the looper swing fitting port 19, resulting in the lifting and lowering of the looper swinging arm 20. It is possible to swing the looper shaft 11 around the shaft center over the range.

In addition, the looper front and rear 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. The looper front and rear member 22 is rotatably fitted to the looper front and rear eccentric ring 21, and the looper front and rear arms 24 are connected to the front end of the looper front and rear member 22 by connecting pins 23. . That is, the other end of the connecting pin 23 whose one end is pivotally pivoted to the looper front and rear member 22 is inserted into the long hole 24a of the looper front and rear arm 24, and the nut is connected to the connecting pin 23. It is screwed in and the fall of the arm 24 before and behind a looper is prevented. In addition, the looper front-rear axis 25 is pivotally pivoted to the sewing bed 2, and the above-mentioned looper front-rear arm 24 is rotatably fitted in this looper front-rear axis 25. As shown in FIG. In the looper shaft 11, a looper shaft collar 26 into which the operating part 24b of the looper front and rear arms 24 can contact is fitted in the sewing bed 2 and fixed with a screw.

In addition, in order to prevent the looper front-rear arm 24 from falling off from the looper front-rear axis 25, the looper front-rear axis 25 is fitted with the looper front-rear arm 24 positioned with respect to the looper front-rear axis 25 from right and left. The looper front and rear shaft collars 27 are fitted and fixed with screws.

Therefore, when the spindle 15 rotates, the looper front and rear member 22 fitted to the looper front and rear eccentric ring 21 which rotates integrally with the main shaft 15 is the shaft center and the main shaft 15 of the looper front and rear eccentric ring 21. Advances in the front-rear direction over a distance twice as large as the eccentric distance from the axial center. Then, as the looper front and rear members 22 retreat, the looper front and rear arms 24 swing around the looper front and rear shaft 25, and the operating portion 24b is connected to the looper shaft collar 26. By pressurizing the motion, the looper shaft 11 can be moved forward and backward in the axial center direction over the swinging range of the arm 24 before and after the looper.

Here, the connecting pins 18 pivoted on the looper swing member 17 and the connecting pins 23 pivoted on the looper front and rear members 22 are perpendicular to each other. In addition, the above-mentioned looper shaft 11 and the connecting pin 18 pivoted 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.

The rotational power is transmitted to the pulley 14 via the electric motor and belt which are not shown in figure, and the main shaft 15 rotates, the needle 5 is moved up and down, and at the same time the main shaft 15 in the sewing bed 2 is carried out. The connected looper swing eccentric ring 16 and the looper front and rear 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. The looper front and rear members 22 fitted to the looper front and rear eccentric ring 21 while raising and lowering in the vertical direction over a distance twice the eccentric distance from the axial center of the shaft. Advances in the front-rear direction over the distance twice the eccentric distance from the shaft center.

The lifting and lowering of the looper swing member 17 raises and lowers the looper swing joint 19 connected to the looper swing joint 17 and at the same time lifts 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 range of the looper swinging arm 20.

Further, the advance and retreat of the looper front and rear member 22 causes the looper front and rear arms 24 connected to the looper front and rear member 22 to swing around the looper front and rear shaft 25, so that the operating portion 24b of the looper shaft collar 26 Pressurizes. In this case, since the looper shaft collar 26 is integrally connected to the looper shaft 11, the looper shaft 11 is moved forward and backward in the axial direction thereof over the swinging range of the operating portion 24a of the looper front and rear arms 24. You can. 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 and moves back and forth along the looper shaft 11 to move the back and forth of the needle 5. In synchronism with the vertical motion, the elliptical trajectory is moved by oscillation around the position where the needle falls and the back and forth movement.

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 retreat of the looper shaft 11 by the looper front and rear arms 24 are used. The movement is performed smoothly 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 actuating portion 24b of the looper front and rear arms 24 is brought into direct contact with the looper shaft collar 26 which is connected to the looper shaft 11, so that the rocking motion of the looper front and rear arms 24 is controlled. Although the case where conversion to the forward and backward movement of the looper axis | shaft 11 was demonstrated, as shown to FIG. 5 and FIG. 6, the angle | corner 29 for each member is connected to the actuating part 24b of the looper front-back arm 24 via each member. The members 30 may be pivotally rotatable, and each member 30 may be brought into 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 front and rear arms 24, It is possible to reliably transmit the swinging motion 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 (2)

Nearly perpendicular to the vertical movement direction of the needle, and having a shaft center in the conveying direction of the workpiece, 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, In a looper drive device which swings a looper shaft around an axial center in a synchronous manner with a needle moving up and down by rotation, and moves it forward and backward in an axial direction, The looper shaft has a single axis over its entire length, and a looper rocking arm for oscillating the looper shaft is connected to the looper shaft in the sewing bed, and a pair of loopers for sandwiching the front and rear arms of the looper back and forth to advance and retract the looper shaft. Looper drive device characterized in that the shaft collar is connected. The looper drive device according to claim 1, wherein each of the members in contact with the looper shaft collar is pivotally rotatable on the front and rear arms of the looper.

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