JP2566565B2 - Overlock sewing machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlock sewing machine in which looper threads can be easily threaded.

2. Description of the Related Art An overlock sewing machine generally has a front cover that can be opened and closed on the front surface. When the front cover is opened, the left looper mechanism is used in a normal single-needle, three-thread overlock sewing machine as shown in FIG. a, a right looper mechanism b, a thread take-up mechanism c for supplying and tightening the looper thread, a guide d, and other various operating mechanisms and parts are exposed, and threading to these is pulled out from the spool behind the sewing machine. Looper thread e
As shown in the figures, first, hook the guides g and h,
Then, after passing through the dial tension i, through the guide d and the thread hooking portion of the thread winding mechanism c, one looper thread e is passed through the eye hole of the left looper j, and the other looper thread f is passed through the eye hole of the right looper thread k. It is done by a thing.

Problems to be Solved by the Invention As described above, in the conventional overlock sewing machine, various mechanisms and parts are exposed when the front cover is opened. It had to be found without any trouble, and it had to be threaded one after another in a predetermined order, which made the threading operation troublesome. As shown in the figure, in an overlock sewing machine that has a right looper mechanism and a left looper mechanism, and each looper mechanism must be threaded, there are many threading points, and the threading points are complicated, so the threading points are correct. It was quite troublesome to go through them in order.

In a conventional overlock sewing machine, when the looper thread is excessively supplied, it may be caught by an operating mechanism such as a looper mechanism or a thread reeling mechanism, which may cause thread breakage. In addition, this may cause the yarn to cling to the movable portion when the yarn breakage occurs due to other reasons.

An object of the present invention is to provide a left looper mechanism and a right looper mechanism, and in an overlock sewing machine in which threading can be performed in each looper mechanism, the threading points of both mechanisms are made common and the threading point is set as a whole. Therefore, the number of threads is reduced, which facilitates threading and simplifies the structure.

Means for Solving the Problems The present inventor has experimentally found 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 portion of the guide and the thread reeling mechanism, no trouble is caused in the sewing. . The second invention was made based on this knowledge, and is to make it possible to commonly use the thread hooking points in each looper mechanism.

That is, the present invention includes a left loop mechanism and a right looper mechanism through which the looper thread is passed, a thread take-up mechanism for supplying and tightening the looper thread to each looper mechanism, and a guide through which the looper thread is passed, and cooperates with the needle. In an overlock sewing machine that forms a hemming with a hem, at least one of the thread take-up mechanism and the guide is shared so that the thread for the right loop and the thread for the left looper can be hung at the thread hooking portion at the same location. Is characterized by.

Commonization is the guide and the thread hooking part of the thread take-up mechanism.
Although it is possible to provide only one place, it is desirable that the number of places is large because the threading becomes easier and the structure is simplified.

In the present invention, in order to make threading easier,
It is desirable to provide a cover plate that covers the actuating mechanism, and to form a groove in which the thread hooking portion of the thread reeling mechanism projects.

Here, the cover plate may be provided in place of the conventional front cover, but it is preferably provided together with the front cover, and the cover plate is exposed when the front cover is opened.

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

The thread hooking portion may have a hook shape or a hole.

The groove may have any size as long as it allows movement of the thread hooking portion, and its shape is not limited, but it is preferably formed to have a minimum size along the locus of the thread hooking portion.

The sewing machine targeted by the present invention is generally an overlock sewing machine, and is not limited to an overlock sewing machine having a single needle and three threads.

In the drawings, reference numeral 1 is a cover plate which is attached to the front surface of the bed of the overlock sewing machine by screws so as to cover the right looper mechanism 3 and the like except the right looper 2, which is shown when the front cover 4 is opened. The arcuate groove 5 is formed and the guides 6 and 7 are attached, and the thread take-up lever 8 attached to the right looper mechanism 3 projects through the former groove 5,
The lever 8 swings in the groove by the right loop mechanism 3. In the figure, 9 is a left looper mechanism, and 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 a side stitch.

It should be noted that the order of threading is illustrated by an illustration on the one-dot chain line on the right side of the cover plate 1.

As shown in FIG. 1, the looper thread is threaded by looping the looper threads 13 and 14 individually passed through the dial tensions 12 on the thread hooking portions of the guide 6 and the thread take-up lever 8, and then looping one looper thread. 13 is passed through the guide 7 to the right looper 2 and the other looper thread 14 is passed to the left looper 11 respectively.

EFFECTS OF THE INVENTION According to the present invention, the number of threading points is reduced, and therefore, the threading sequence is less confusing and less likely to be mistaken, which facilitates threading and simplifies the structure. .

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a front cover of an overlock sewing machine according to the present invention is opened, FIG. 2 is a perspective view of essential parts of the overlock sewing machine when a cover plate is removed, and FIG. FIG. 3 is a front view of the overlock sewing machine of FIG. 1 ... Cover plate, 3 ... Right looper mechanism 4 ... Front cover, 5 ... Groove, 6, 7 ... Guide 8 ... Threading lever, 9 ... Left looper mechanism

Claims (2)

(57) [Claims] 1. A left looper mechanism and a right looper mechanism through which the looper thread is passed, a thread take-up mechanism for supplying and tightening the looper thread to each looper mechanism, and a guide through which the looper thread is passed.
In an overlock sewing machine that cooperates with a needle to form a sewn edge stitch, at least one of the thread take-up mechanism and the guide is made common, and the right looper thread and the left looper thread are provided in the same thread hooking portion. An overlock sewing machine characterized by being adapted to be hung. 2. The cover according to claim 1, wherein a cover plate 1 for covering the looper mechanism, the thread reeling mechanism and the like is attached to the front surface of the bed, and the thread hooking portion of the thread reeling mechanism is projected through a groove formed in the cover plate. Lock sewing machine.