JPH0719433Y2 - Sewing machine thread guide device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a thread guide device of a sewing machine used as a guide for a thread unwound from a thread winding at the time of sewing and as a tension device for applying an appropriate tension at the time of winding the thread. .

2. Description of the Related Art Generally, a sewing machine is separately provided with a guide for guiding the yarn unwound from the bobbin and a tension device for applying a tension to the yarn at the time of winding the bobbin. This is because the guide used at the time of sewing has only to have a function of guiding and rectifying the thread, and the tension applied is small, while the tension device used at the time of winding the thread is used. Is because it is necessary to give a considerable tension to the yarn. By adjusting the tension of the tension device, it is possible to handle it at the time of sewing and winding of the thread.
It is extremely troublesome to adjust the tension so that the tension is appropriate each time sewing or winding the thread.

In order to deal with this problem, there has been proposed a yarn guide device that can be used as a guide during sewing and as a tension device during winding of a yarn. One example is the one shown in Japanese Utility Model Publication No. 59-41809, in which the length of the presser foot section is changed by changing the direction of the thread during sewing and winding the thread to change the length of the presser foot section. When used as, the holding section is reduced to give a weak tension, and when used as a tension device at the time of winding the yarn, the holding section is lengthened to give a strong tension.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional yarn guiding device described above, when used as a tension device at the time of winding the yarn, depending on the type of the yarn, the pressing pressure to the yarn tends to be strong or weak, If it passes too much, the thread wound on the bobbin will be bitten into a tightly wound state, while if too weak, it will be wound loosely and the winding amount will decrease. If the spring pressure can be adjusted, the pressing pressure can be changed, but when used as a guide, the tension tends to be too strong.

The present invention is intended to solve the above problems by improving the yarn guiding device described above.

Therefore, the thread guiding device of the present invention therefore comprises a main body fixed to the sewing machine, a holding plate attached to the main body, and spring means for lightly contacting the holding plate with the main body. Change the length of the pressing section to the thread by changing the direction by changing the direction when winding and winding the thread, and when using it as a guide during sewing, reduce the pressing section so that weak tension is applied, Also, in a thread guide device of a sewing machine in which a holding section is lengthened to apply a strong tension when it is used as a tension device when winding a thread, a holding plate is pressed against the main body on the thread path side when it is used as a tension device. Second spring means to be attached and adjusting means for adjusting the spring pressure of the second spring means are provided.

According to the yarn guiding device of the present invention, when used as a guide, the spring pressure of the second spring means does not act on the yarn or hardly acts on the yarn, so that tension is lightly applied to the yarn. When winding the yarn, the spring pressure of the second spring means is applied,
Although the pressing pressure on the yarn increases, the pressing pressure can be adjusted by the adjusting means so that the yarn tension becomes appropriate.

A typical example of the first and second spring means in the present invention is a spring, and examples of the adjusting means include a nut for pressing a spring mounted on a screw rod, a screw for pressing the spring, and the like.

The yarn passing through the yarn guiding device tends to move to the one with less resistance, and when used as a tension device, it tends to deviate from the yarn path and the holding section tends to become short. Therefore, it is desirable to provide a yarn guide in the yarn guiding device so as to restrain the movement of the yarn and prevent the yarn from deviating from a predetermined yarn path. This thread path is
Preferably, the protrusions are formed so as to project at regular intervals, and more preferably, one of the protrusions has an inclined surface, and is formed as a guide for introducing a thread between the protrusions.

EXAMPLE As shown in FIG. 5, a thread guiding apparatus generally designated by A is attached to an appropriate position on a top plate 1 of a sewing machine, and a thread B fed from a thread winding 2 passes through the thread guiding apparatus A and is sewn. The yarn is fed to a sewing machine needle (not shown), and when the yarn is wound, the yarn is guided by a yarn guide device so that the yarn is fed to the bobbin 3 for winding.

As shown in FIGS. 1 to 4, the yarn guiding device A has a pair of detents 4 projecting from one end at a fixed interval, and one detent 4 and an appropriate interval. And a slanted portion 5 that is projected in parallel, a pin 6 is projected in the center of the curved portion, and a projecting piece 7 that projects laterally and upward is provided in the middle portion, and is fixed by being inserted into the top plate 1. A U-shaped main body 8 having the same shape as that of the main body 8 and a side edge of the main body 8 that is bent upward and has a hook portion 9 that fits between the detents 4 at one side end and a curved portion of the upper surface. An annular part 11 fitted to the pin 6 in the center
And a pressing plate 13 projectingly forming an annular portion 12 located between the inclined portion 5 and the detent 4, a spiral spring 14 fitted and supported by the annular portion 11, and a supporting member fitted and supported by the annular portion 12. Provided with the spiral spring 15 and the projecting piece 16 having the same U shape as the main body 8 and projecting laterally and downwardly at a position corresponding to the projecting piece 7 and forming an appropriate gap between the projecting piece 7 and the projecting piece 16. , A cap 17 which is put on the holding plate, a flat head bolt 18 which is screwed into the pin 6 through the cap 17, the spiral spring 14 and the annular portion 11 to fix the cap 17 to the main body 8, and screwed to the cap 17. , And an adjusting screw 19 for pressing the spiral spring 15.

The present device is configured as described above, and the thread B fed from the thread winding 2 is passed between the projecting pieces 7 and 16 and then passed between the holding plate 13 and the main body 8 and is hung on the pin 6 for sewing. It is pulled out to the front side and pulled downward from the front surface of the sewing machine to reach the sewing machine needle. At the time of winding the yarn, the yarn B hooked on the pin 6 is pulled toward the bobbin 3 side, and the inclined portion 5 is slid to pass between the whirl-stop 4 and the inclined portion 5. And it is extended to the bobbin. In this state, the thread B is passed under the spiral spring 15, and a predetermined thread tension is applied by the pressing pressure of the spring.

Effect of the Invention This effect is configured as described above, and has the following effects.

According to the yarn guiding device of the first aspect, the yarn can be used as a guide at the time of sewing by changing the yarn by changing the direction or as a tension device at the time of winding the yarn, and the second spring can be used at the time of winding the yarn. An appropriate thread tension can be obtained by further applying the spring pressure of the means and adjusting the holding pressure by the adjusting means.

By providing the yarn path according to the second aspect, the yarn can be constantly maintained in a predetermined yarn path and a required yarn tension can be applied.

By providing the inclined portion according to the third aspect, threading into the yarn path becomes easy.

[Brief description of drawings]

1 is a side view of a thread guide device according to the present invention, FIG. 2 is an exploded perspective view of a moving device, FIG. 3 is a view showing a thread path at the time of sewing and thread winding, and FIG. 4 is a view of FIG. FIG. 5 shows a perspective view of the sewing machine as seen obliquely from above, taken along the line AA. 1 ... Top plate, 2 ... Bobbin, 3 ... Bobbin, 4 ... Rotation stop, 5 ... Inclined part, 6 ... Pin, 8 ... Main body, 13 ... Presser plate 14, 15 ... Spiral spring, 17 …… Cap 19 …… Adjustment screw

Claims (3)

[Scope of utility model registration request] 1. A thread, which comprises a main body fixed to a sewing machine, a holding plate attached to the main body, and spring means for lightly elastically contacting the holding plate with the main body, the thread changing direction during sewing and winding of the thread. Change the length of the presser foot section to the thread by changing the thread and use it as a guide at the time of sewing to reduce the presser foot section so that a weak tension is applied, and also as a tension device when winding the thread. In a thread guide device of a sewing machine in which the holding section is sometimes lengthened so that a strong tension is applied, a second spring means for pressing the holding plate against the main body on the thread path side when used as a tension device, and a second spring means. 2. A yarn guiding device, characterized in that adjustment means for adjusting the spring pressure of the spring means is provided. 2. A thread guide device for a sewing machine according to claim 1, wherein a thread path is provided on the thread path when used as a tension device. 3. The thread guide device for a sewing machine according to claim 2, wherein the thread path has an inclined portion which serves as a guide when the thread is introduced.