JPS6020032B2 - A sewing machine that can perform both 1-needle, 2-thread edge overlock stitches and 1-needle, 3-thread edge overlock stitches. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing machine that can perform both one-needle, two-thread green overlock stitches and one-needle, three-thread green overlock stitches, and in particular, one-needle, two-thread green overlock stitches using a hook looper. This invention relates to a sewing machine that can selectively perform sewing and one-needle, three-thread overlock stitching using an upper looper.

Conventionally, in a sewing machine equipped with a needle combing mechanism, an upper looper drive mechanism, and a lower looper drive mechanism, one needle and three thread green overlock stitches are performed using the needle and the upper and lower loopers. One-needle, two-thread overlock stitching has been practiced using Kagiroopa.

However, in order to perform the above two types of green overlock stitches,
This was possible only by replacing the upper looper attached to the mount of the upper looper with a key looper, and conversely by replacing the key looper with the upper looper. Attaching and detaching the looper to replace it is not only troublesome but also requires considerable skill, which has the drawback of making it difficult for those engaged in general sewing work. SUMMARY OF THE INVENTION The present invention aims to eliminate this drawback, and its purpose is to provide a sewing machine that can selectively perform either one-needle, three-thread green overlock stitch or one-needle, two-thread green overlock stitch. The purpose is to provide a sewing machine that allows even beginners to easily make the above selections, and the purpose is to provide a sewing machine in which the other upper looper or key looper, which is not in use, can be used for sewing work. Our goal is to provide a sewing machine that does not interfere with the sewing process. That is, in a sewing machine equipped with a needle-camellia drive mechanism, an upper looper drive mechanism, and a lower looper drive mechanism, the rotating body 3 to which the upper looper 1 and the hook looper 2 are attached is attached to the looper of the upper looper drive mechanism. It is rotatably attached to the base 4, and the rotating body 3 and the looper mounting base 4
A positioning mechanism 5 for specifying the stop position of the rotating body 3 is interposed between the upper looper 1 and the upper looper 1 by the rotation of the rotating body 3.
The present invention relates to a sewing machine that can perform both one-needle, two-thread edge overlock stitches and one-needle, three-thread overlock stitches, characterized in that the key looper 2 is configured to be selectively usable.

Next, the present invention will be explained based on the drawings showing one embodiment.

This sewing machine has a needle birch drive mechanism, an upper looper drive mechanism,
The sewing machine is equipped with a lower looper drive mechanism, and in particular, the upper looper 1 and key looper 2 associated with the looper mounting base 4 of the upper looper drive mechanism are essential parts of the present invention. The upper looper 1 and the key looper 2 are mounted on a rotating body 3 so as to be symmetrical with respect to the center of the rotating body 3. The rotating body 3 is rotatably attached to the looper mounting base 4. In this embodiment, the rotating body 3 is attached to the looper mounting base 4 so that the tips of the upper looper 1 and the key looper 2 rotate on the same plane and with the same diameter, and the rotation plane is the axis of the looper mounting base 4. It is configured so that it is perpendicular to the direction. Note that the rotation of the rotating body 3 may be configured such that its rotation plane is orthogonal to the cloth feeding direction. The upper looper and the key looper 2 can be switched by rotating the rotating body 3, and from this, both loopers,
The tip of No. 2 needs to rotate in the same circle. Both loopers 1 and 2 are connected to the rotating body 3 by bolts 6 at their bases.
The rotating body 3 is mounted on the upper end of the looper mount 4. The rotating body 3 is rotatably mounted between the washer 8 and the stepped portion 9 of the looper mount 4 by the bolt 7 and washer 8. The looper mount 4 has a coil spring 11 inside that urges the ball 10 at the tip outward.
A recess 12 is formed on the inner peripheral surface of the rotating body 3 facing this, and when the rotating body 3 rotates in a predetermined manner, a ball 10 is inserted into the recess 12 and the upper looper 1 or key looper 2 is placed in a predetermined position. becomes stable. The ball 10, coil spring 11, and recess 12 form the positioning mechanism 5, but it goes without saying that various other positioning means can be employed. According to this invention, the upper looper 1 is used to
When performing a main needle three-thread overlock stitch, the above-mentioned green overlock stitch can be performed simply by rotating the upper looper 1 together with the rotating body 3 and positioning it at a predetermined position. The upper looper is positioned at a predetermined position by a positioning mechanism 5. That is, when the upper looper 1 rotates to a predetermined position, the ball 10 biased by the coil spring 11 is inserted into the recess 12 of the rotating body 3, and the upper looper 1 attached to the rotating body 3 is positioned at a predetermined position. be done. When performing a one-needle, two-thread loose overlock stitch using the hook looper 2 instead of the upper louver 1, rotate the hook looper 2 together with the rotating body 3;
It may be positioned in the same manner as the upper looper 1. Note that at the start of this rotation, a certain degree of rotational force must be applied to the rotating body 3 in order to make the ball 10 of the positioning mechanism 5 escape from the recess 12 of the rotating body 3 against the bias of the coil spring 11. . In this embodiment, the upper looper and the key looper 2 are in symmetrical positions with respect to the center of the rotating body 3, so switching between the two loopers 1 and 2 is done by rotating 180 degrees, but the mounting position of both the loopers 1 and 2 is If they are not in symmetrical positions, it is sufficient to rotate them according to their respective angles.

As is clear from the above, according to the present invention, by simply rotating the upper looper and the key looper together with the rotating body, one needle and two
It is possible to easily switch between the main thread edge overlock stitch and the one-needle, three-thread loose overlock stitch.

In addition, since there is a relatively large gap around the right side of the upper looper mounting base in this type of green overlock sewing machine, it is best to point the unused loopers of the upper looper and key looper toward this gap so that they do not get in the way of work. It will never happen. Furthermore, since the upper looper and the key looper are attached to the looper mount via the rotating body, there is no risk of losing the looper when it is not in use.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a sectional view taken along line B-B in FIG. 2, and FIG. 4 is a cross-sectional view of FIG. It is a sectional view taken along the line A-A. In the figure, 1 is the upper looper, 2 is the key looper, 3 is the rotating body,
4 is a looper mounting base, and 5 is a positioning mechanism. Fin 1 Figure Shark 21 Number 3 Figures Approx. Mu Rut

Claims (1)

[Claims] 1. In a sewing machine equipped with a needle bar drive mechanism, an upper looper drive mechanism, and a lower looper drive mechanism, a rotary body equipped with an upper looper and a key looper is rotatably mounted on the looper mounting base of the upper looper drive mechanism, and A positioning mechanism for specifying the stop position of the rotating body is interposed between the rotating body and the looper mounting base, and the upper looper and the key looper can be selectively used by rotating the rotating body. A sewing machine that can perform double-thread edge stitching and single-needle, three-thread edge stitching.