TWI760582B - Minimal stitch device of chain stitch sewing machine - Google Patents

Abstract

A minimal stitch device of chain stitch sewing machine includes an actuator, a rocking arm and an eccentric wheel. The actuator is fixed in a chassis. The rocking arm corresponds to the actuator configuration and its maneuverability drive. The rocking arm having a first hole and a second hole. The first hole is providing a rotation shaft through and connected to a deliver clothes mechanism. The eccentric wheel includes a base section and an eccentric section connected to the base section. The base section is connecting to an end of the eccentric wheel. The eccentric section is through pass the second hole and a moving space is formed between a peripheral margin of the eccentric section and an inner wall of the second hole.

Description

Close stitch unit for chain stitch sewing machines

The present invention relates to a chain stitch sewing machine technology, in particular to a close stitching device for a chain stitch sewing machine.

Press, the existing sewing machines can be roughly divided into two categories: lock stitch and chain stitch according to the stitching form of the stitches. Among them, lock stitch is through the mutual cooperation of the rotary shuttle and the needle, so that the needle thread and the shuttle thread are sewn to the fabric in a knotted manner. On the other hand, the stability and firmness of the stitching is generally better than that of the chain stitch, and the sewing machine is equipped with a reverse stitching device, which is used to make the fabric through the reverse operation of the feeding mechanism at the end of the sewing stroke. The reverse movement is produced to prevent the end of the sewing thread from coming off the thread.

The existing chain stitch sewing machine is limited by the stitching form, and cannot operate with a reverse stitching device like a lock stitch sewing machine. Therefore, unfavorable situations such as thread breakage often occur at the end of the sewing thread.

In order to solve this problem, the industry uses the operator to pull back the fabric, so as to reduce the seam distance to produce a form like a close seam, but because the pulling force applied by each operator is different, and some fabrics It is also not suitable for being pulled, so it cannot effectively prevent the occurrence of detachment of the tail section of the sewing thread.

In view of this, the inventor of the present invention has devoted himself to the study of the above-mentioned prior art and cooperated with the application of theories, trying his best to solve the above-mentioned problems, which is the goal of the present inventor's improvement.

One object of the present invention is to provide a close stitching device for a chain stitch sewing machine, which can effectively prevent the tail section of the sewing thread from coming off the thread through the arrangement of the close stitching device, thereby improving the quality of the fabric after sewing. Stability and firmness.

In order to achieve the above object, the present invention provides a close stitching device for a chain stitch sewing machine, the chain stitch sewing machine has a machine base, a transmission device and a cloth feeding mechanism, and the transmission device has an eccentric wheel a connecting rod, the close seam device includes an actuator, a rocking arm and an eccentric shaft, the actuator is fixed on the base; the rocking arm is arranged corresponding to the actuator and is operably affected by the actuator Drive, the rocking arm is provided with a first through hole and a second through hole, the first through hole is for a rotating shaft to pass through and is connected with the cloth feeding mechanism through the rotating shaft; the eccentric shaft includes a base shaft segment and is connected to the base shaft segment An eccentric section, the base shaft section is threaded and fixed at one end of the eccentric connecting rod, the eccentric section is threaded corresponding to the second through hole, and is connected between the outer periphery of the eccentric section and the second through hole. An action space is formed between the inner walls.

The present invention also has the following effects: through the design of the action space of the eccentric section and the second perforation, the tight seam effect can be achieved without changing the main structure, not only the installation cost is low, but also the modification or replacement is quite easy and convenient. convenient. Through the design of the conical positioning hole, it is conducive to the precise positioning effect of the yaw direction of the eccentric shaft.

1: close seam device

10: Actuator

11: Cylinder block

12: putter

13: Air pipe

20: rocking arm

21: Cylinder

211: First Piercing

22: Arm

221: Second Perforation

23: Boss

231: Slotting

24: Bolts

25: Spindle

26: Girdle

27: Lever

28: Extension spring

30: Eccentric shaft

31: Base shaft segment

311: Positioning hole

32: Eccentric segment

321: The first arc surface

322: Second arc surface

A: Action space

θ1: The first working angle

θ2: Second working angle

8: Chain stitch sewing machine

81: base

82: Arm

83: Transmission

831: Upper transmission mechanism

832: Lower transmission mechanism

833: Eccentric connecting rod

834: Screw

84: Feeding mechanism

85: Needle bar mechanism

9: Fabric

91: Stitches

Fig. 1 is a combined appearance view of the close stitching device of the present invention combined with a chain stitch sewing machine.

Figure 2 is a schematic diagram of the combination of the close seam device, the transmission device and the cloth feeding mechanism of the present invention.

FIG. 3 is another perspective view of FIG. 2 .

FIG. 4 is a top view of FIG. 2 .

Fig. 5 is an exploded schematic view of the close seam device and the transmission device of the present invention.

Fig. 6 is a view showing the use state of the swing arm before the actuator of the present invention is actuated.

Fig. 7 is a view showing the use state of the swing arm after the actuator of the present invention is actuated.

FIG. 8 is a schematic diagram of the stitches produced by the close-stitching device of the present invention.

The detailed description and technical content of the present invention are described below in conjunction with the drawings. However, the accompanying drawings are only for reference and description, and are not intended to limit the present invention.

Referring to FIG. 1 , the present invention provides a close-stitching device for a chain-stitch sewing machine. The close-stitching device 1 is installed on a chain-stitch sewing machine 8 , and the chain-stitch sewing machine 8 mainly includes a machine base 81 . , a machine arm 82, a transmission device 83, a cloth feeding mechanism 84, a needle bar mechanism 85 and other related mechanisms and components, the machine arm 82 is fixed above the machine base 81, and the transmission device 83 mainly includes an upper transmission Mechanism 831 and lower transmission mechanism 832, the upper transmission mechanism 831 is installed inside the machine arm 82, and one end of the upper transmission mechanism 831 is connected to the needle bar mechanism 85, and the other end of the upper transmission mechanism 831 is connected to the lower transmission mechanism 832; the lower transmission mechanism 832 It is installed inside the machine base 81 and used to drive the upper transmission mechanism 831 and the cloth feeding mechanism 84 to perform corresponding transmission. The needle bar mechanism 85 is driven by the upper transmission mechanism 831 to drive the needle bar mechanism 85 to reciprocate in the upper and lower directions. Movement, the cloth feeding mechanism 84 is driven by the lower transmission mechanism 832, thereby driving the cloth feeding mechanism 84 to reciprocate in the front and rear directions.

Please refer to FIGS. 2 to 5 , the sealing device 1 of the present invention mainly includes an actuator 10 , a rocking arm 20 and an eccentric shaft 30 .

The actuator 10 is fixed on the aforementioned base 81, and the actuator 10 can be a pneumatic cylinder, an oil hydraulic cylinder, an electric cylinder or other actuating components. It includes a cylinder block 11 and a push rod 12. The cylinder block 11 is fixed on the rear side of the machine base 81 through locking elements such as bolts (as shown in FIG. 1), and the side of the cylinder block 11 is connected to two The gas pipe 13 and the push rod 12 are connected to the central position of the cylinder block 11 and formed in the inner space of the aforementioned machine base 81. The cylinder 11 moves out or moves in.

The rocking arm 20 is configured and operably driven by the actuator 10. The rocking arm 20 mainly includes a cylindrical body 21 and two arms 22 extending outward from the periphery of the cylindrical body 21. A first through hole 211 is provided at the center of the body 21, a boss 23 extends from one side of the cylindrical body 21, and a slot 231 is formed in the boss 23 to communicate with the first through hole 211, through a bolt 24 corresponding to the section. The vertical direction of the groove 231 is locked, so that the inner diameter of the cylindrical body 21 can be scaled and changed. A second through hole 221 is provided at one end of each support arm 22 away from the cylindrical body 21 , and the shape of the second through hole 221 in this embodiment is a circle.

The eccentric shaft 30 mainly includes a base shaft section 31 and an eccentric section 32. The lower transmission mechanism 832 has an eccentric wheel connecting rod 833, and a positioning hole 311 is provided on one side of the base shaft section 31. The positioning hole 311 is conical. The cross-sectional surface of the base shaft section 31 is a circle, which is threaded through one end of the eccentric link 833 and fixed by a screw 834 through the eccentric link 833 and the positioning hole 311 .

The eccentric segments 32 can be single or plural. The number of the eccentric segments 32 in this embodiment is two, which are respectively connected to two different end surfaces of the base shaft segment 31. The cross-section of the eccentric segments 32 mainly includes A first arc-shaped surface 321 and a second arc-shaped surface 322, wherein the first arc-shaped surface 321 and the base shaft segment 31 has the same axis line and the same radius, and the axis line of the second arc-shaped surface 322 is formed on one side of the axis line of the base shaft segment 31 (ie, the axis lines do not coincide). The eccentric section 32 corresponds to the second through hole 221 , and an action space A is formed between the back surface of the second arc surface 322 of the eccentric section 32 and the inner wall of the second through hole 221 .

Further, the close seam device 1 of the present invention further comprises a tie ring 26, a lever 27 and a tension spring 28, the tie ring 26 is sleeved and fixed on the aforementioned rotating shaft 25, and the lever 27 is connected to the tie ring 26. One end of the tension spring 28 is fixed to the bottom section of the lever 27 and the other end is fixed to the base 81 (as shown in FIG. 3 ) through a latch, so that the lever 27 can be moved by the elastic force of the tension spring 28. The rotating shaft 25 is rotated together with the collar 26 , so that the second arc surface 322 of the eccentric section 32 can maintain contact with the inner wall surface of the second through hole 221 under normal conditions (as shown in FIG. 6 ).

Please refer to Fig. 6, Fig. 7 and Fig. 8. With the combination of the above components, a cloth 9 is placed on the machine base 81 and formed between the cloth feeding mechanism 84 and the needle bar mechanism 85 through a After the motor (not shown) drives the lower transmission mechanism 832 to operate, it will simultaneously drive the needle bar mechanism 85 to reciprocate upward and downward, and the cloth feeding mechanism 84 to reciprocate forward and backward.

As shown in FIG. 6 , before the push rod 12 of the actuator 10 is not actuated, the eccentric link 833 will drive the rocking arm 20 to swing by a first working angle θ1 through the eccentric section 32 of the eccentric shaft 30 . At this time, the first arc-shaped surface 321 and the inner wall surface of the second through hole 221 are used for contact transmission, and through the swing of the rocking arm 20, the cloth feeding mechanism 84 is driven by the rotating shaft 25 to transfer the cloth 9 in the horizontal direction, and through the The needle bar mechanism 85 sews the cloth 9, and the stitches 91 between the strokes from the upper section to the middle section as shown in FIG. 7 can be obtained.

As shown in FIG. 7 , when sewing to the end of the fabric 9, through the actuation of the push rod 12 of the actuator 10, the rocking arm 20 will be pushed by the push rod 12 to generate deflection. two curved surfaces 322 is in contact with the inner wall of the second through hole 221, and the eccentric link 833 drives the rocking arm 20 to swing at a second working angle θ2. Since the second working angle θ2 is smaller than the first working angle θ1, the rotating shaft 25 If the horizontal transfer distance of the transmission and feeding mechanism 84 is short, the stitches 91 at the end of the stroke as shown in FIG. 8 can be obtained, thereby achieving the effect of tight stitching.

To sum up, the close stitching device for chain stitch sewing machine of the present invention can indeed achieve the intended purpose of use, and solve the deficiencies of conventional knowledge, and because of its novelty and progress, it fully complies with the requirements of the invention patent application, If you file an application in accordance with the Patent Law, please check and approve the patent in this case to protect the rights of the inventor.

1: close seam device

10: Actuator

11: Cylinder block

12: putter

13: Air pipe

20: rocking arm

25: Spindle

30: Eccentric shaft

832: Lower transmission mechanism

833: Eccentric connecting rod

834: Screw

85: Needle bar mechanism

Claims (9)

A close-stitching device for a chain-stitch sewing machine, the chain-stitch sewing machine has a machine base, a transmission device and a cloth feeding mechanism, the transmission device has an eccentric link, the close-stitching device comprises: an actuator, fixed on the base; a rocking arm, which is configured and operably driven by the actuator, the rocking arm is provided with a first through hole and a second through hole, the first through hole is It is provided for a rotating shaft to pass through and is connected to the feeding mechanism through the rotating shaft; and an eccentric shaft, including a base shaft section and an eccentric section connected to the base shaft section, the base shaft section is threaded and fixed on the eccentric wheel At one end of the connecting rod, the eccentric section corresponds to the second through hole, and an action space is formed between the outer peripheral edge of the eccentric section and the inner wall of the second through hole; wherein the cross-section of the eccentric section includes A first arc-shaped surface and a second arc-shaped surface connected to the first arc-shaped surface, the cross-section of the base shaft segment is a circle, and the first arc-shaped surface and the base shaft segment have the same axis line and the same radius. The close stitching device for a chain stitch sewing machine as claimed in claim 1, wherein the second perforation is a circle, and the operating space is formed on the back of the second arc-shaped surface and the inner wall of the second perforation between. The close stitching device for a chain stitch sewing machine as claimed in claim 1, wherein a positioning hole is provided on one side of the base shaft section, and a screw is passed through the eccentric link and the positioning hole to be fixed to the base shaft part. The close stitching device for a chain stitch sewing machine as claimed in claim 3, wherein the positioning hole is a conical shape. The close stitching device for a chain stitch sewing machine as claimed in claim 1, further comprising a tie ring, a lever and a tension spring, the tie ring is sleeved and fixed on the rotating shaft, and the lever is connected to In the tow ring, one end of the tension spring is fixed to the other end of the lever and then fixed to the base. The close stitching device for a chain stitch sewing machine as claimed in claim 1, wherein the actuator comprises a cylinder block and a push rod, the cylinder block is fixed on the machine base, the push rod is connected to the cylinder block and formed in the inner space of the base. The close stitching device for a chain stitch sewing machine as claimed in claim 1, wherein the rocking arm comprises a cylindrical body, an arm extending outward from the periphery of the cylindrical body, and the first perforation is formed in the circle A cylindrical body, the second through hole is opened at one end of the support arm away from the cylindrical body. The close stitching device for a chain stitch sewing machine as claimed in claim 7, wherein the actuator comprises a cylinder block and a push rod, the cylinder block is fixed on the machine base, the push rod is connected to the cylinder block and corresponding to the arm. The close stitching device for a chain stitch sewing machine as claimed in claim 7, wherein a boss extends from one side of the cylindrical body, and a slot is opened on the boss which communicates with the first perforation, through a The bolts are locked corresponding to the vertical direction of the slot.

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