JPS6326150Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a looper thread control device in a double chainstitch sewing machine or an interlock stitch sewing machine.

Double chainstitch sewing machines or interlock stitch sewing machines usually control the amount of thread by feeding or letting out the looper thread near the looper on the looper thread supply path from the thread supply source to the looper, depending on the stitch formation process. A control device is provided.

This control device has a slit formed in a fixed thread reel in the bed, from which a fixed thread control cam protrudes from the lower shaft, and the amount of protrusion can be changed according to the rotation of the lower shaft. The looper thread passed through a thread guide device consisting of a thread path provided on a stand and a thread winding guide is passed around a thread control cam to ensure that it follows changes in the amount of protrusion of the cam from the thread winding stand. Although the device is designed to control the amount of yarn, the entire device is installed close to the lower shaft and located in the center of the bed, so the work space when passing the looper thread through the thread guide device is narrow, making threading work difficult. Furthermore, when the looper thread breaks and becomes wrapped around the thread control cam, it is difficult to unwind the thread and it takes time and effort to remove the thread winding stand.

The object of this invention is to solve the above-mentioned problems and provide a looper thread control device that can easily pass the thread through the thread guide device and handle the thread when it is wrapped around the thread.

The figure shows one embodiment of the present invention.
The figure shows an example in which a looper thread control device 1 according to the present invention is installed in a cylindrical bed 2 of a double chainstitch sewing machine or an interlock stitch sewing machine capable of sewing cylindrical articles.

As shown in detail in FIGS. 2 and 3, the thread control device 1 has a slit 3 in the center with one end open, and a pair of thread control devices arranged in parallel on the lower shaft 4 at an appropriate distance within the slit. The thread reel 6 has a thread reel 6 into which the thread control cam 5 is inserted, and a thread reel guide 8 whose position is adjustable with a set screw 7 behind the thread control cam. The passages 9 are fixed with set screws 10 so that their positions can be adjusted, and a thread reeling guide 12 extending along the slit 3 is rotatably fixed in the vertical direction to the bent portion 11 on the other end of the slit. The guide 12 is located between the two thread control cams when the thread take-up table 6 is set as described below, and the looper thread is passed between the guide 12 and a thread receiving rod, which will be described later.

On the other hand, the above-mentioned thread receiving rod 14 extending between both thread control cams is attached to the thread take-up guide 8 by a set screw 15.
A pair of guide grooves 16 parallel to the thread receiving rod 14 are preferably formed at the same interval as the width of the slit 3 on both sides of the thread control cam. It extends to sandwich a part of the slit, and the front side portions of the thread reel on both sides of the slit are slidably inserted into the groove. Each guide groove 16 is also provided with a plate spring 17 fixed with a set screw 18 for holding down and supporting the front side of the thread reel inserted into the groove.

When setting the thread take-up stand 6, it is done by inserting both thread control cams 5 into the slit 3, pushing it in, and then inserting both front side parts into the guide grooves 16 under the leaf springs. It is desirable to provide positioning means when pushing in, so that the thread take-up stand can always be set at a predetermined position. One example of positioning means is shown in FIG. 3 as a step 19 formed on the side end face of the front side. That is, the portion on the near side of the step 19 is formed wider than the guide groove 16, so that it is caught at this portion when inserted and prevents further insertion.

The thread reeling stand 6 set as described above can be removed by simply pulling it toward the front by pulling out its front side from the guide groove.

When threading, pull out the thread take-up stand 6 toward you with its front part engaged with the guide groove, or pull out the front part from the guide groove and remove it. After passing the looper thread underneath, set it as described above. When the looper thread is wound around the control device due to thread breakage or the like, the thread take-up stand and the like are similarly removed from the set position. However, the looper thread that has become tangled can be easily unraveled, and then threaded and set again. When setting, the looper thread is initially placed in slit 3.
The yarn is bent upward or toward the front by the more protruding yarn control cam 5, but as the yarn control cam rotates counterclockwise, it moves rearward (towards the back of the bed), and the contour of the yarn control cam and It comes to be located near the intersection with the thread reeling guide, and from then on, in this state, as in the known case, the looper thread is drawn in or drawn out by increasing or decreasing the amount of protrusion from the slit 3 as the thread control cam rotates, and the yarn amount is changed. is now under control.

As described above, the thread reel 6 is set or removed from the set position, but in order to easily and reliably set the thread reel 6, it is desirable to provide a guide means for guiding the thread reel 6. Therefore, in the illustrated embodiment, a guide stand 21 is fixed in the bed 2 with a set screw 22, and a guide plate 23 is formed protruding from the guide stand 21.
A guide bar 24 is provided parallel to the guide bar 24, and an angular metal fitting 26 is fixed to the thread reeling stand 6 and has a horizontal groove 25 into which the guide plate 3 is slidably fitted. A rod 24 fixes a pipe-shaped shaft 27 into which the rod 24 is slidably inserted. This shaft 27 is provided so as to protrude toward the front so that it also functions as a handle.

If the thread reel head can be moved forward and backward only in one direction by the guide means as described above, the thread reel head can be set by only one-touch operation of pushing the thread reel head.

In the embodiment described above, the thread receiving rod 14 is provided on the thread reel guide 8 side, and the front side of the thread reel is removably supported by the guide groove and the leaf spring. The rod 14 may be attached to the thread reel 6 instead of the thread reel guide 8, and the latter thread reel may be attached to the front side of the thread reel by a locking means such as a concave and convex portion provided instead of a leaf spring, or by a slit-shaped locking means. It may also be removably supported by other support means such as a flat square pipe with a fitting hole formed therein. Further, the pair of supporting means provided to support the front side portions of the thread reeling block may be omitted so that only the front side portion of the other thread reeling stand is supported, thereby supporting the thread reeling stand. .

As described above, the looper thread control device of the present invention includes at least the first three of the thread reeling stand, the thread guide provided on both sides of the slit of the control device, the thread reeling guide, and the thread receiving rod that constitute the control device. It is detachably supported and set on the support means, and when necessary, it can be removed from the support means and brought to the front, making it easy to thread the thread. can also be easily processed.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a sewing machine equipped with a looper thread control device according to the present invention, Fig. 2 is an enlarged perspective view of the main parts of the sewing machine, and Fig. 3 shows the state when the thread take-up stand etc. are removed from the set position. FIG. DESCRIPTION OF SYMBOLS 1... Control device, 2... Bed, 3... Slit, 5... Thread control cam, 6... Thread reeling stand, 8...
Thread reel guide, 9... Thread guide, 12... Thread reel guide, 14... Thread receiver bar, 16... Guide groove, 17...
...Plate spring, 19...Step, 21...Guidance stand, 23...
...Guide plate, 24...Guide rod, 25...Horizontal groove, 27
……shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A thread reel with a slit formed therein, and a thread control that is fixed to the lower shaft and protrudes from the slit of the thread reel, and the amount of protrusion from the thread reel is changed according to the rotation of the lower shaft. It consists of a cam, a thread path provided on both sides of the slit of the thread reeling stand, a thread receiving rod, and a thread reeling guide through which the looper thread is passed between the thread receiving rod. A sewing machine that is passed between a thread receiving rod and a thread take-up guide and engaged with the thread control cam, and controls the amount of thread by drawing in or letting out the looper thread by changing the amount of protrusion from the thread take-up table as the cam rotates. In this looper yarn control device, one end of the slit 3 formed in the thread reeling stand 6 is opened, and among the thread guide 9, thread reeling guide 12, and thread receiving bar 14, at least the thread guide and the thread reeling guide are connected to the thread reeling stand. It is attached to the bed 2, and inside the bed 2 there are
A looper thread control device is provided with a support means in which at least one side is removably inserted and supported, and the thread take-up stand supported by the support means and set can be removed from the set position by pulling it out. . (2) The looper thread control device according to claim 1, wherein the support means comprises a guide groove 16 and a plate spring 17 that clamps the front side portion between the guide groove. (3) The looper thread control device according to claim 2, wherein a locking means such as a concavo-convex portion is provided in place of the leaf spring. (4) The looper thread control device according to claim 1, wherein the support means is a member having a slit-like insertion hole. (5) Registered claim 1, in which at least one of the thread reel stand and the support means is provided with positioning means 19 so that the thread reel stand is set at a predetermined position.
The looper thread control device described in . (6) The looper yarn control device according to claim 1, wherein the yarn reeling stand is guided by a guide means so as to move forward and backward in one direction. (7) The guide means is a guide board 23 installed in parallel inside the bed.
The looper yarn control device according to claim 6, comprising a shaft 27 and a lateral groove 25 provided on the guide rod 24 and the thread reeling table side, into which the guide plate 23 and the guide rod 24 are slidably inserted, respectively. (8) The looper thread control device according to claim 7, wherein the shaft 27 projects toward the front and also functions as a handle for operating the thread reel.