JPS63117787A - Overlock sewing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an overlock sewing machine that allows easy threading of looper threads.

Conventional wave 1 overlock sewing machines generally have a front cover that can be opened and closed, and when the front cover is opened, a normal one-needle three-thread overlock sewing machine, as shown in Figure 3, will have a front cover that can be opened and closed.
Various operating mechanisms and parts are exposed, such as the left looper mechanism a, the right looper mechanism b, the thread reeling mechanism C that supplies and tightens the looper thread, and the guide d. As shown in the figure, the looper threads C and f that have been pulled out are first passed through guides g and h, then passed through dial tension i, passed through guide d, the threading mechanism of thread reeling mechanism C, and one looper thread e is placed on the left. Roopa j
This is done by passing the other looper thread f through the hole in the right looper thread.

Problems to be Solved by the Invention As mentioned above, with conventional overlock sewing machines, when the front cover is opened, various mechanisms and parts are exposed. The threading process was troublesome, as the threading had to be done one after the other in a predetermined order without markings. In particular, as shown in the figure, an overlock sewing machine has a right looper mechanism and a left looper mechanism, and each looper mechanism must be threaded. It was quite troublesome to go through them in an orderly manner so that there was no problem.

In conventional overlock sewing machines, when the looper thread becomes slack due to being supplied in excess, it may get caught in operating mechanisms such as the looper mechanism or thread reeling mechanism, resulting in thread breakage. Furthermore, when thread breakage occurs due to this or other causes, the thread may become wrapped around the movable part.

The first object of the present invention is to facilitate threading by making it easy to identify the point where the looper thread is to be hung, and to remove the threaded looper thread and the broken looper thread from the looper mechanism, thread reeling mechanism, etc. This is to prevent it from getting caught or entangled in the operating mechanism.

A second object of the present invention is to provide an overlock sewing machine that is equipped with a left looper mechanism and a right looper mechanism and that allows threading to each looper mechanism. The aim is to reduce the number of hooking points, thereby making threading easier and simplifying the structure.

Means for Solving the Problems In order to achieve the first object, an overlock sewing machine is provided in which a cover plate is attached to cover the operating mechanism, and a groove is formed in the cover plate from which the thread hooking portion of the thread take-up mechanism projects.

Although the cover plate may be provided in place of the conventional front cover, it is preferably provided together with the front cover so that the cover plate is exposed when the front cover is opened.

The cover plate may also cover only the actuating mechanism, but preferably also the guides and other protruding parts. In this case, the cover plate is formed with a transparent window through which the thread hook of the guide protrudes. Note that the guide may be provided directly on the cover plate.

The thread hook part may be hook-shaped or woven.

The groove may be of any size as long as it allows the movement of the part, and its shape does not matter, but preferably the thread is formed to the minimum size that follows the locus of the part.

The sewing machines to which the present invention is directed are general overlock sewing machines, and are not limited to three-needle, three-thread overlock sewing machines.

Regarding the second objective, the inventor has found through experiments that even if the looper thread for the left looper and the looper thread for the right looper are passed through the same thread hook of the guide and thread reeling mechanism, no problem occurs in sewing. I got it. The second invention was made based on this knowledge, and consists in making it possible to commonly use thread hooking points in each looper mechanism.

That is, the second invention is an overlock sewing machine that is equipped with a left looper mechanism and a right looper mechanism, in which thread is passed through each looper mechanism. The feature is that the threads for use pass through the same place.

The parts that will be made common are the guide and thread reeling mechanism.
- It is preferable to use only one place, but the more places there are, the easier it will be to thread the thread, and the structure will be simpler.

In the present invention, it is desirable to use the above-mentioned cover plate in combination to make threading even easier.

In the embodiment diagram, reference numeral 1 denotes a cover plate that is attached with screws to the front of the bed of the overlock sewing machine, covering the right looper mechanism 3, etc. except for the right looper 2, and is exposed when the front cover 4 is opened. An arcuate groove 5 is formed and guides 6 and 7 are attached to it, and a thread reeling lever 8 attached to the right looper mechanism 3 protrudes through the former groove 5, and the lever 8 is swung by the right looper mechanism 3 within the groove. In Figure 0, numeral 9 is a left looper mechanism, and numeral 10 is a needle that cooperates with the right looper 2 and the left looper 11 to form a single-needle, three-thread edge or slit seam.

The order of threading is illustrated in the dot-dash line on the right side of the guide bar plate 1.

As shown in FIG.
4 to the guide 6 and the thread reel lever 8, and then pass one looper thread 13 through the guide 7 to the right looper 2.
This is done by passing the other looper thread 14 through the left looper 11 respectively.

Effects of the Invention According to the first invention, the operating mechanism except the thread hook part is covered with the front cover, and the thread hook part is exposed to the front cover.
The location of the thread hook can be clearly seen at a glance, making threading easier. Moreover, even if the looper thread becomes loose, it will not be caught in the operating mechanism, and the thread will not be caught and break, or the broken thread will not be caught in the operating mechanism.

According to the second aspect of the present invention, the number of places through which the thread is threaded is reduced, and as a result, there is less chance of getting confused or making a mistake in the order in which the thread is threaded, thereby making it easier to thread the thread and simplifying the structure.

[Brief explanation of the drawing]

Fig. 1 is a front view of an overlock sewing machine according to the present invention when the front cover is opened, Fig. 2 is a perspective view of the main parts of the overlock sewing machine with the cover plate removed, and Fig. 3 is a conventional one. FIG. 2 is a front view of the overlock sewing machine. 1. Cover plate 3. Right looper mechanism 4. Front cover 5. Groove 6.7 Guide 8. Thread reeling lever 9. Left looper 41 Akira Fuji ・- Figure 1 Figure 2 Figure 3

Claims (5)

[Claims] (1) In an overlock sewing machine that is equipped with a looper mechanism and forms hem stitches in cooperation with a needle, a cover plate 1 that covers the looper mechanism, thread take-up mechanism, etc. is attached to the front of the bed, and the thread hook part of the thread take-up mechanism is attached to the front of the bed. An overlock sewing machine in which the (2) The overlock sewing machine according to claim 1, wherein a guide is provided protruding from the cover plate. (3) The overlock sewing machine according to claim 1, wherein the groove is formed to a minimum size that allows movement of the threading part. (4) In an overlock sewing machine that is equipped with a left looper mechanism and a right looper mechanism through which the looper thread is threaded, and which cooperates with the needle to form edge stitches, the thread threading points of both looper mechanisms are made common. An overlock sewing machine characterized by passing the thread for the left looper and the thread for the right looper through the same location. (5) The overlock sewing machine according to claim 4, wherein a cover plate 1 covering a looper mechanism, a thread reeling mechanism, etc. is attached to the front of the bed, and a thread hooking part of the thread reeling mechanism is made to protrude through a groove formed in the cover plate.