JP2007143931A - Thread guide device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thread guide device capable of preventing thread disturbance between a thread take-up lever and a sewing needle. <P>SOLUTION: This thread guide device is provided with an arm spool pin and thread eyelet 21, a first thread tensioner 22, a second thread tensioner 23, the thread take-up spring 24, a thread hooker 25, a first thread guide 26, a thread take-up lever 27, a second thread guide 28, a needle bar thread guard 29, and a needle bar thread guide 30 in the order of the upstream side of the thread route. The first thread guide 26 in the upstream side of the thread take-up lever 27 is disposed in a part lower than the lowest point of the thread take-up lever 27. The second thread guide 28 in the upstream side of the thread take-up lever 27 is disposed in a part lower than the lowest point of the thread take-up lever 27 and further lower than the first thread guide 26. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a yarn guide device that guides a yarn from a yarn supply source to a sewing needle via a balance.

In a conventional sewing machine, a thread is guided from a thread supply source to a sewing needle via a balance (see, for example, Patent Document 1 and Patent Document 2). For example, as shown in FIG. 3, the thread 199 led from the thread supply source is composed of a thread guide rod 121, a thread tensioner 122, a thread tensioner 123, a thread take-up spring 125, a thread hook 124, a thread guide 126, a balance. 127, the thread guide 128, and the needle bar thread hook 129 are sequentially guided to the sewing needle 108. The thread guide 126 on the upstream side of the balance 127 is installed at the same height as the thread guide 128 on the downstream side of the balance 127.
JP-A-4-146794 Japanese Utility Model Publication No. 6-81480

  However, in the sewing machine as shown in FIG. 3, the thread 199 is loosened when the balance 127 is lowered, so that the thread 199 is detached from the thread guide 128 or the thread 199 is largely loosened between the thread guide 128 and the sewing needle 108. Or get tangled.

  Therefore, the present invention has been made to solve the above-described problems, and an object thereof is to prevent yarn runaway between a balance and a sewing needle.

  In order to solve the above-described problems, the invention according to claim 1 is provided on the front surface of the frame on the upstream side of the yarn path from the balance and the balance that moves up and down along the front surface of the frame of the sewing machine. A first yarn guide, and a second yarn guide provided on the front surface of the frame on the downstream side of the yarn path from the balance, and disposed above the sewing needle, from a yarn supply source In the yarn guide device that guides the yarn to the sewing needle through the first yarn guide, the balance, and the second yarn guide in order, the first yarn guide and the second yarn guide The tool is disposed below the lowest point of the range of vertical movement of the balance, and the second thread guide is disposed below the first thread guide.

  As described above, the first thread guide and the second thread guide are disposed below the lowest point of the balance, and the second thread guide is disposed at a position lower than the first thread guide. As a result, it is possible to prevent the yarn from greatly violating between the second yarn guide and the sewing needle.

  The invention according to claim 2 is the yarn guide device according to claim 1, wherein the front surface of the frame is connected to the vertical surface and the lower end of the vertical surface, and is inclined so as to go backward as it goes down. The second thread guide is provided on the vertical surface above the boundary between the vertical surface and the inclined surface.

  As described above, since the second yarn guide is provided above the boundary between the vertical surface and the inclined surface, the yarn can be prevented from hitting the boundary between the vertical surface and the inclined surface.

  According to the first aspect of the present invention, it is possible to prevent the yarn from greatly violating between the second yarn guide and the sewing needle, and the yarn can be stably supplied to the sewing needle.

  According to the invention of claim 2, it is possible to prevent the yarn from hitting the boundary between the vertical surface and the inclined surface, and it is possible to prevent excessive tension from being applied to the yarn, and to prevent yarn runaway.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

  As shown in FIGS. 1 and 2, the sewing machine 1 includes a table 2 and a frame 3 provided on the table 2. The frame 3 includes a vertical body portion 4 raised upward from the table 2, an arm portion 5 extending leftward from the upper portion of the vertical body portion 4, and an jaw projecting downward from the left end portion of the arm portion 5. Part 6. The jaw portion 6 is tapered so as to become thinner toward the lower end. On the jaw part 6, the front surface of the arm part 5 is a vertical surface 51, and the front surface of the jaw part 6 is an inclined surface 61 that is inclined with respect to the front surface of the arm part 5. Inclined to head.

  A needle bar 7 is provided at the lower end of the jaw 6, a sewing needle 8 is provided at the lower end of the needle bar 7, and a thread hole is formed in the sewing needle 8. The sewing machine 1 is a lockstitch sewing machine, and a hook device is provided below the sewing needle 8 and below the table 2, and lock stitching is performed by the cooperation of the sewing needle 8 and the hook device.

  The sewing machine 1 is provided with a yarn guide device that guides the yarn from a spool serving as a yarn supply source to the sewing needle 8. The yarn guide device includes, in order from the upstream side of the yarn path, a yarn guide rod 21, a first thread tensioner 22, a second thread tensioner 23, a thread take-up spring 24, a thread hook 25, 1 thread guide 26, a balance 27, a second thread guide 28, a needle bar thread hook 29, and a needle bar thread guide 30.

  The thread guide rod 21 is provided so as to stand on the upper surface of the arm part 5, and the first thread tensioner 22 is provided on the upper front surface of the arm part 5, and the thread guides are provided upstream and downstream of the first thread tensioner 22. Guide holes 22a and 22b are respectively provided. A second thread tensioner 23 is provided below the first thread tensioner 22 and at the lower part of the front surface of the arm portion 5. A thread take-up spring 24 is provided on the second thread tensioner 23, and a thread hook 25 is provided on the left side of the second thread tensioner 23.

  A first thread guide 26 is provided on the front surface of the arm portion 5 and between the first thread tensioner 22 and the second thread tensioner 23. A balance 27 is provided on the left side of the first thread guide 26 so as to extend forward from the front surface of the arm portion 5. The balance 27 is provided so as to reciprocate up and down along the front surface of the arm portion 5. It has been. The first thread guide 26 is disposed below the lowest point in the vertical movement range of the balance 27. In addition, in FIG. 1, the balance 27 has shown the state located in the lowest point.

  A second thread guide 28 is provided on the left side of the balance 27. The second thread guide 28 is disposed below the lowest point of the balance 27, and further disposed below the first thread guide 26. As shown in FIG. 2, the second yarn guide 28 is disposed above the boundary between the inclined surface 61 of the jaw portion 6 and the vertical surface 51 of the arm portion 5, and is provided at the lower end of the vertical surface 51. It has been.

  As shown in FIG. 1, the height to the first thread guide 26 is A based on the position of the second thread guide 28, and the lowest point of the balance 27 is based on the first thread guide 26. If the height to B is B and the height to the lowest point of the balance 27 is C with respect to the second thread guide 28, the height A and the height B are substantially equal, and the height C is high. It is approximately twice the height A.

  The needle bar thread hook 29 is provided above the needle bar 7 below the second thread guide 28, and the needle bar thread guide 30 is provided below the needle bar 7 below the needle bar thread hook 29. Yes. Assuming that the height to the second thread guide 28 is E based on the needle bar thread hook 29, the height E is four times the height A. The hole of the sewing needle 8 is below the needle bar thread guide 30.

  The yarn guide path is as follows. The thread 99 from the spool is passed through the hole of the thread guide rod 21, and then the thread 99 is passed through the thread guide hole 22 a on the upstream side of the first thread tensioner 22 and then the first thread tensioner 22. And then passed through the downstream yarn guide hole 22b. Next, the thread 99 is pinched by the thread tensioner 23, and is then hooked on the thread take-up spring 24 and then on the thread hook 25. Next, the thread 99 is passed through the first thread guide 26, then through the balance 27, and then through the second thread guide 28. Next, the thread 99 is hung on the needle bar thread hook 29, next on the needle bar thread guide 30, and finally passed through the hole of the sewing needle 8. Note that FIG. 2 shows a state in which the thread 99 is removed for easy viewing of the drawing.

  In this thread guide device, only one second thread guide 28 is provided between the balance 27 and the needle bar 7, and between the second thread guide 28 and the needle bar thread hook 29. There is no thread guide or thread hook.

  In the sewing machine 1 provided with this thread guide device, the lock 27 is moved up and down together with the sewing needle 8 to perform the main sewing. When the balance 27 is lowered, the thread 99 is loosened. However, since the second thread guide 28 is disposed at a position lower than the first thread guide 26, the second thread guide 28 to the sewing needle 8. It is possible to prevent the thread 99 from greatly loosening and the thread from coming off from the second thread guide 28.

  Further, since the second thread guide 28 is disposed in the vicinity of the boundary above the boundary between the vertical surface 51 and the inclined surface 61, the thread 99 is prevented from hitting the boundary between the vertical surface 51 and the inclined surface 61. Therefore, it is not necessary to apply extra tension to the yarn 99, and the yarn 99 can be prevented from being violated.

The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, although the sewing machine 1 is a lockstitch sewing machine, the thread guide device according to the present invention can also be applied to a chain stitch sewing machine. In the case of a chain stitch sewing machine, a looper is provided below the table 2 instead of the shuttle device.

It is a front view of a sewing machine. It is a left view of a sewing machine. It is a front view of the conventional sewing machine.

Explanation of symbols

1 Sewing Machine 3 Frame 8 Sewing Needle 26 First Thread Guide 27 Balance 28 Second Thread Guide

Claims (2)

A scale that moves up and down along the front of the frame of the sewing machine;
A first yarn guide provided on the front surface of the frame on the upstream side of the yarn path from the balance;
A second thread guide provided on the front surface of the frame on the downstream side of the thread path from the balance and disposed above the sewing needle, and the thread from a thread supply source is fed to the first thread guide. In the thread guide device for guiding the sewing needle through the tool, the balance, and the second thread guide in order,
The first thread guide and the second thread guide are disposed below the lowest point of the range of vertical movement of the balance, and the second thread guide is lower than the first thread guide. A yarn guide device arranged below.   The front surface of the frame has a vertical surface and an inclined surface that is continuous with the lower end of the vertical surface and is inclined backward toward the bottom, and the second thread guide is formed between the vertical surface and the inclined surface. The yarn guide device according to claim 1, wherein the yarn guide device is provided on the vertical surface above the boundary.

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