KR100460792B1 - Sewing machine of the take cotton device - Google Patents

Abstract

The present invention is to provide an upper thread clamp device of a sewing machine for the purpose of accurately holding the upper thread while gripping the lower thread of the needle between the needle and the presser foot by using a holding means.

Another object of the present invention is to provide an upper thread clamp device of a sewing machine intended to save the sewing thread by preventing the waste of the thread by keeping the upper thread as short as possible from the needle.

In addition, another object of the present invention is to improve the work efficiency by preventing the thread is separated from the needle during the clamping process and the thread is cut and to provide an upper thread clamp device of a sewing machine.

The present invention to achieve the above object,

A pressure plate which is moved back and forth by the solenoid actuating unit, which consists of two opposing leaf springs, one end of which is configured as a pin shaft, to be pressed or released;

A rod which is moved back and forth by the solenoid operating part and which combines the pressure plate,

A slide plate for seating the rod and the pressure plate to move the rod and the pressure plate back and forth;

The upper cover plate is provided, and the upper thread clamping device of the sewing machine, characterized in that consisting of a presser foot configured to guide wall so that the slide plate is moved forward and backward.

Description

Upper thread clamp device of sewing machine {Sewing machine of the take cotton device}

The present invention relates to the upper thread clamp device of the sewing machine for clamping the upper thread remaining in the lower part of the needle after the sewing operation is completed.

In more detail, after the sewing operation is finished, the upper thread that is automatically cut after the end of the sewing operation to hold the bar bar The present invention is provided with a plate spring pressure plate on the top of the presser foot behind the needle to cut the remaining Since the upper thread is pressed, the upper thread clamp device of the sewing machine to shorten the length of the upper thread and to clamp more stably.

In general, when the sewing operation is finished, the thread is automatically cut for the next operation at the top of the sewing material (lower presser foot).

In order to solve this problem, a number of devices that hold the remaining thread at the lower end of the needle immediately after the work has been developed and disclosed.

However, most of these devices are constructed to install an inhaler to inhale air on the side of the needle, and to draw the thread between the needle and the presser foot with a lever to guide one end of the thread to the inlet of the inhaler to hold the thread as the inhaler. Not only was it complicated, but there was a problem that it could not hold the thread correctly.

That is, the conventional apparatus includes a suction device for sucking the upper thread in the front part of the sewing machine, a conveying device for guiding the upper thread to the inlet of the suction device, and a needle for securing the upper thread of the extra length drawn by the conveying device in advance. It consists of a thread winding device that pulls the upper thread (supply chamber) of a certain length.

1 and 2 show a conventional prior art (Publication No. 2002-0067971).

The apparatus comprises a thread winding device 54, a thread winding wire 54b, an upper thread holding device 40, a wiper 60, and the like.

Explain its effect.

After the sewing is finished, the thread sealed to the sewing material is automatically cut at the bottom of the presser foot 31, that is, the sewing material, as known. At this time, the needle 32 is in a raised state, and the shank trajectory 35, that is, a gap is formed between the needle and the presser foot 31. As the wiper 60 passes through the trajectory, the upper thread 33 is still tensioned between the sewing material and the needle, and guided to the suction port 44 of the upper thread holding device 40, which is a suction device, and the upper thread 33. The tip of the upper end of the upper thread 33 is clamped by being sucked by the suction port 44 of the bar,

The upper thread 33 moved by the wiper 60 at this time is covered as a thread supplied from the supply chamber of the needle upper end. (If the thread is not supplied from the upper part of the needle, the lower thread is pulled and the thread is short and cannot be moved to the suction device.)

Therefore, the wire 54b is lifted by the thread winding device 54 between the needle 32 hole and the supply chamber (a chamber passing through the pretension 50 and the rotary tension 52), and the supply chamber is sufficiently pulled to obtain an extra length. Since a separate thread winding device is required, the upper thread inserted in the needle hole is cut or the supply chamber previously pulled from the thread winding device 54 is moved from the needle hole during the instant movement of the upper thread with the wiper 60. When it does not pass quickly, the upper thread cutting line of the presser foot lower rises first, and the upper thread disengages from the wiper 60 so that the upper thread cannot be transferred to the inlet 44, and thus the upper thread cannot be clamped.

The present invention has been proposed to solve the above problems, an object of the present invention is to sew the thread of the lower needle between the needle and the presser foot immediately after sewing by using a holding means for sewing machine for the purpose of accurately performing the upper thread gripping The upper thread clamp device of the present invention.

Another object of the present invention is to provide an upper thread clamp device of a sewing machine intended to save the sewing thread by preventing the waste of the thread by keeping the upper thread as short as possible from the needle.

In addition, another object of the present invention is to provide an upper thread clamp device of a sewing machine, which improves the work efficiency by preventing the thread from being separated from the needle in the clamping process and preventing the thread from being cut.

The present invention to achieve the above object,

A rod, which is moved forward and backward by a solenoid operation part, is composed of two opposing leaf springs, one end of which is configured as a pin shaft, and a forward and backward movement by a solenoid operation part and a pressure plate that is configured to be pressed or released;

A slide plate for seating the rod and the pressure plate to move the rod and the pressure plate back and forth;

The upper part is provided with a cover plate, and the upper thread clamping device of the sewing machine, characterized in that composed of a presser foot configured to guide the slide plate forward and backward.

1 is a partial perspective view of the prior art

2 is a functional state diagram of the prior art

Figure 3 is an overall assembly view showing an embodiment of the present invention

4 is an exploded perspective view of the present invention

Figure 5a, b is a longitudinal cross-sectional view of the use state of the present invention

Figure 6 is a cross-sectional view showing the operation of the present invention

* Code description for main part of drawing

100: sewing machine 10: needle holder

20: presser foot fixing stand 11: needle

21: presser foot 23: guide home

24: guide wall 30: pressure plate

31: shaft pin 40: rod

41: coupling pin 42: groove

50: slide plate 51: slide ball

52: pin hole 53: through hole

60: spring 61: ball bearing

70: cover 200: solenoid operation portion

201: control lever 202: K-bul

300: clamp device

Hereinafter, with reference to the accompanying drawings showing an embodiment of the present invention will be described the configuration and effect.

Figure 3 is a side view showing a state in which the clamp device of the present invention is attached.

According to the illustration, the sewing machine 100 is fixed with a needle 11 fixed to the needle holder 10 and a presser foot 21 fixed to the presser foot holder 20. The upper part of the presser foot 21 shows that the control lever 201 that is adjusted to the solenoid operation part 200 and the clamp device 300 connected to the cable 202 connected thereto are installed.

The supply chamber (S) is inserted into the hole of the needle (11) and the supply chamber (S) is maintained in a tensioned state by the side pretension 101 and the rotary tension 102 of the sewing machine 100, in the clamp device The pressure-sensitive plate 30 that is 300 shows a state of pressing the thread.

4 is an exploded perspective view of the clamp device 300 of the present invention.

The control lever 201 is adjusted by the solenoid operation unit 200,

It is connected to the cable 202 connected to the control lever 201, coupled to the slide plate 50 by the coupling pin 41 and the groove 42 at the front end of the pressure plate 30 consisting of two leaf springs Rod 40 connected to the tip,

The pin hole 52 and the slide hole 51 to which the shaft pin 31 and the coupling pin 41 of the rod 40 and the pressure plate 30 are coupled are respectively drilled, and the sidewalls are supported by a spring 60. A slide plate 50 having a through hole 53 in which two ball bearings 61 are inserted;

A guide wall 24 having a guide groove 23 through which two holes 22 are drilled so that the slide plate 50 slides forward and backward, and a presser foot 21 having a cover 70 fixed thereon. It consists of).

5A and 5B are cross-sectional views illustrating a coupling state of the clamp device of FIG. 4.

The rod 40 and the slide plate 50 are coupled with the coupling pin 41, and are configured to penetrate the slide hole 51 so that the rod 40 moves back and forth within the allowable range. One end of the pressure plate 30 is caught in the groove 42 of the rod 40 and the other end of the right side of the pressure plate 30 is pinched or released by the shaft pin 31.

The rod 40 and the pressure plate 30 are mounted on the slide plate 50, and are configured to be secured to the hole 22 of the guide wall 24 by the ball bearing 61.

It can be seen that the cover 70 is coupled to the top of the guide wall 24 of the presser foot 21 and is coupled to the presser foot fixing base 20.

FIG. 5A illustrates a state in which the rod 40 is retracted, and a state in which the thread is pushed back on the pressure plate 30,

5B illustrates a state in which the pressure plate 30 is advanced, that is, the slide plate 50 is moved to the right, and the pressure plate 30 grips the thread of the lower end of the needle.

6 shows an operating state of the present invention.

In FIG. 6A, the slide plate 50 is moved to the left side, and the rod 40 is also moved to the left side so that the coupling pin 41 is moved to the left side of the slide hole 51.

In addition, the ball bearing 61 of the slide plate 50 is supported by the left hole 22 of the guide wall 24.

In this state, the pressure plate 30 is in a state in which the right end is pressed around the shaft pin 31 and the work is in progress or the work is stopped.

6B illustrates a state in which the solenoid control lever 201 is operated to move the rod 40 to the right side when the sewing operation is completed.

The tip of the pressure plate 30 coupled to the groove 42 of the rod 40 is moved to the right side so that the coupling pin 41 of the rod 40 moves to the right through the slide hole 51 of the slide plate 50. This causes the right side portion of the pressure plate to be opened about the shaft pin 31.

6C is a continuous operation of FIG. 6B, when the rod 40 continuously moves to the right side, the slide plate 50 is moved to the right side, and is moved to the thread S of the lower end of the needle in the state where the pressure plate 30 is opened.

The slide plate 50 is stabilized by the ball bearing 61 when moved to the right side completely.

FIG. 6D illustrates a state in which the rod 40 is moved to the left to hold the seal S. FIG.

The coupling pins 41 of the rod 40 are moved to the left side of the slide hole 51 of the slide plate 50. In this case, the pressure plate is in a state in which the slide plate 50 is pressed, and the slide plate 50 is not moved.

6E illustrates a process of pulling a thread in a state in which a paper plate is pressed.

When the rod 40 is continuously pulled through the process of FIG. 6D, the slide plate 50 is moved to the left side, and the ball bearing 61 is hung on the left hole 22 of the guide wall 24 by the spring 60. It is stable.

6F illustrates a process of releasing one end of the upper thread that was held when a new sewing operation is started, and it is advantageous to release the end thread when the sewing operation is started. Therefore, as shown in FIG. 6B, the rod 40 is pushed slightly. If you give the right side of the pressure plate, the thread will be released.

Hereinafter will be described the operation and effect of the present invention.

See FIG. 6. In the present invention, when the sewing operation is in progress, the solenoid control lever 201 is in a reversed state, the slide plate 50 is moved to the left side and the pressure plate 30 is also waiting to be moved to the left side. A (shown in Fig. 6a)

After the sewing operation is finished, the sewing thread is cut at the top of the sewing material by the sense (not shown in the related art). At this time, the control lever 201 of the solenoid is moved to the right by a predetermined computer program (CPU) to load the rod 40. The pushing surface coupling pin 41 moves along the slide hole 51 drilled in the slide plate 50 at the lower side and pushes the tip of the pressure plate 30. The pressure plate 30 is connected to the right side by the shaft pin 31. (See Fig. 6b)

Subsequently, when the rod advances to the right, the slide plate 50 is moved to the right in the state where the pressure plate 30 is opened. At this time, the ball bearing 61 supported by the spring 60 installed laterally of the slide plate 50 is stabilized by being seated in the right hole 22 by deviating from the hole 22. It is located at a distance where the thread S between the presser feet 21 can be pinched (see FIG. 6C).

When the rod is moved to the right side in this manner, the rod 40 is moved to the left side by the sense. Then, the coupling pin 41 of the rod 40 moves along the slide hole 51 to grip the thread by first holding the pressure plate (see FIG. 6D).

Subsequently, if the rod is continuously moved to the left side, the pressure plate is moved to the left side by the pressure of the coupling pin 41 while the pressure plate is pressed, and the ball bearing 61 is moved to the left side. ) (See Figure 6e)

As the thread is automatically cut after finishing the work of the lower part of the needle as described above, the thread is moved slightly by holding the thread at the lower part of the needle.

At this time, the operation of the pressure plate is as follows.

The rod 40 is moved through the cable 202 connected to the control lever 201, and the slide plate 50 and the pressure plate 30 are moved to the left in the state in which the rod 40 is pulled to the left. When this is completed, the solenoid operation unit detects this and the control lever 201 connected to the solenoid operation unit is operated to push the rod through the cable 202. As shown in FIG. 6B, the right side of the pressure plate 30 is opened. Subsequently, the slide plate 50 is moved to the right side as shown in FIG. 6C to the thread S position of the lower part of the needle 11.

When the rod 40 is moved back to the left side by the predetermined program, the slide plate 50 is first moved as shown in FIG. 6D to pull the thread of a predetermined length as shown in FIG. 6E.

In this way, when the thread is pulled a certain distance, the end of the thread cut from the upper end of the sewing product exits through the presser foot to maintain the reworking state. When the rework is started, as shown in Figure 6f, the solenoid actuating part pushes the rod only slightly to open the pressure plate to release the thread, so sewing is possible.

In addition, in the case of two-line sewing with a plurality of needles, the operation may be achieved by installing two pressure sheets, and in the case of zigzag sewing (aka Ovarogu sewing), the clamp device of the present invention is installed at the top of the presser foot and is integrally formed. Since the above object can be achieved.

As described above, in the present invention, the thread between the presser foot and the needle is fixed by holding the thread between the presser foot and the needle so that there is no waste of thread, and the thread can be gripped accurately. Hold the grip correctly so that the thread does not fall out of the needle.

According to the present invention, after the work is finished, the needle at the bottom of the needle is held by a pressure plate, so the work is very accurate and there is no problem that the needle is broken or the thread is pulled out from the needle. Is large.

Claims (1)

In the upper thread clamp device of the sewing machine, The control lever 201 is adjusted by the solenoid operation unit 200, Is connected to the cable 202 connected to the control lever 201, coupled to the slide plate 50 by the coupling pin 41, there is a groove 42 at the tip, the pressure plate 30 consisting of two leaf springs A rod (40) connecting the tip of the The pin hole 52 and the slide hole 51 to which the shaft pin 31 and the coupling pin 41 of the rod 40 and the pressure plate 30 are coupled are respectively drilled, and the sidewalls are supported by a spring 60. A slide plate 50 having a through hole 53 in which two ball bearings 61 are inserted; A guide wall 24 having a guide groove 23 through which two holes 22 are drilled so that the slide plate 50 slides forward and backward, and a presser foot 21 having a cover 70 fixed thereon. Upper thread clamp device of the sewing machine characterized in that consisting of.