JPS6332702Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a needle plate for an overlock sewing machine that allows the width of the overlock stitch to be adjusted in an overlock sewing machine that overlocks the edges of cloth.

Generally, the overlocking width of an overlock sewing machine is regulated by the width of the overlock claw on the throat plate, and in order to change the overlock width, the needle plate must be replaced with one that has an overlock claw of the desired width, which is a time-consuming process. The disadvantage was that it took a lot of time and reduced work efficiency.

In order to eliminate this drawback, as in Japanese Patent Publication No. 54-43934 and Japanese Patent Application Laid-Open No. 50-50152, an overlock claw extending in the cloth feeding direction and an adjustment piece along the overlock claw are provided, and the adjustment piece is placed parallel to the overlock claw. It has been proposed that the adjustment piece can be moved in the horizontal direction that intersects the cloth feeding direction and can be moved toward and away from the side surface of the overlock claw, but in order to move and lock the adjustment piece in the horizontal direction that intersects the cloth feeding direction, is provided with a locking part having a long hole or long groove provided in the horizontal direction intersecting the cloth feeding direction from the base of the adjustment piece, and configured to be screwed with a screw that loosely fits into the long hole or long groove. .

In order to move and lock the adjustment piece in the horizontal direction that intersects the cloth feeding direction, the screw must be loosened, the adjustment piece moved to the specified position, and then the screw must be tightened.
Not only is it time-consuming and reduces work efficiency, but the structure is complicated and parts accuracy is required because an adjustment piece in the cloth feeding direction and a horizontal engaging part that intersects with it are provided to move and lock below the throat plate. There were some drawbacks such as being exposed.

The present invention aims to eliminate the above drawbacks.
The first embodiment of the present invention will be explained with reference to the drawings.
The figure is a needle perspective view of the back side of the throat plate of the present invention. 1 is a throat plate for an overlock sewing machine, and a feed dog (not shown) appears in a feed dog groove 2 provided along the cloth feeding direction. It has a screw hole 6 for screwing.

Reference numeral 3 denotes an overlock pawl that extends in the cloth feeding direction on the side of the needle drop point P, and one side of the overlock pawl forms a needle groove 7 together with the side of the throat plate 1.

Reference numeral 4 denotes a guide body provided along the cloth feeding direction on the cloth end side of the back surface of the throat plate 1, and has a tip portion 4a that extends in the cloth feeding direction in a tapered manner along the hooking pawl 3 and comes into contact with the side surface of the grabbing pawl 3; The lower end of the intermediate portion 4b is loosely fitted into a long groove 5 provided parallel to the cloth feeding direction behind the needle drop point P on the back surface of the throat plate 1, so that it can be moved along the long groove 5, and the upper surface of the intermediate portion 4b is made movable. is a first convex portion 8 and a second convex portion 9 on a line parallel to the cloth feeding direction.
are installed protrudingly at regular intervals.

The rear end portion 4C of the guide body 4 is bent horizontally into an L-shape in the direction away from the fabric edge and connected to the long groove 5, and is connected to the throat plate 1.
When the guide body 4 moves in the cloth feeding direction, the front end surface of the rear end portion 4C is engaged. It is configured such that when it is locked on one side of the locking groove 10 and the guide body 4 moves in the opposite direction to the cloth feeding direction, the rear end surface of the rear end portion 4C is locked on the other side of the locking groove 10.

Reference numeral 11 denotes a leaf spring, whose free end 11a extends along the cloth feeding direction so as to cover between the first convex portion 8 and the second convex portion 9 of the adjusting body 4, and is normally provided with contact hands provided at both ends. When the adjustment body 4 is pressed against the throat plate 1 by screws 12 and 13, and the base 11b is fixed to the back surface of the throat plate 1 by screws 14 and 14, and the guide body 4 is moved to the position shown by the solid line in FIG. Rear end contact 13
presses the front end of the second convex portion 9 of the guide body 4 in the direction opposite to the cloth feeding direction to press the rear end surface of the rear end portion 4C of the guide body 4 against the other side surface of the locking groove 10, and The contacting hand 12 at the front end of the spring 11 is adapted to press the upper end surface of the first convex portion 8 of the guide body 4, and at this time, the tip end 4a of the guide body 4 is pressed against the side surface of the overlock claw 3.
The tapered, narrow part of the area is in contact with the horizontal line.

Furthermore, when the guide body 4 is moved from the position indicated by the solid line in FIG. The front end surface of the rear end portion 4C of the guide body 4 is pressed against one side surface of the locking groove 10, and the contacting hand 13 at the rear end of the leaf spring 11 is pressed against the second convex portion 9 of the guide body 4. The upper end surface is pressed, and at this time, the tapered wide part of the tip portion 4a of the guide body 4 is configured to be in horizontal contact with the side surface of the overlock claw 3.

Reference numeral 15 denotes a knife groove through which a lower knife (not shown) faces, and a scale (not shown) is engraved on the surface of the throat plate 1 on the cloth feeding direction side to indicate the position of the teeth of the lower knife corresponding to the overcut width.

In order to overlock the edge of the fabric with a narrow overlock width using the overlock sewing machine with the throat plate 1 of the present invention having the above-described structure, move the holder of the lower knife and place the teeth of the lower knife on the throat plate. Tighten the set screw at the scale marked in 1 indicating the narrow overlock width.

Hold the tip of the rear end portion 4C of the guide body 4 with your fingers and pull it against the pressing force of the leaf spring 11 in the direction opposite to the cloth feeding direction to move the guide body 4 to the position shown by the solid line in FIG.
The sewing machine can be operated by holding the cloth between a presser foot (not shown) and the throat plate 1.

In order to widen the overlocking width, move the lower knife to a position with a wide overlocking width scale (not shown), and hold the tip of the rear end 4C of the guide body 4 with your fingers to apply the pressing force of the leaf spring 11. It is sufficient to pull the guide body 4 in the cloth feeding direction against the force, move the guide body 4 from the position shown by the solid line in FIG.

As described above, the present invention supports the adjusting body 4 extending along the cloth feeding direction on the throat plate so that the tapered tip touches the side surface of the overlock claw 3 so as to be movable back and forth in the cloth feeding direction, and A plate in which a plurality of locking portions 8 and 9 are formed on the upper surface of the intermediate portion 4b of the body 4 at intervals on a line parallel to the cloth feeding direction, and the base portions of the locking portions 8 and 9 are fixed to the throat plate 1. By pressing with the spring 11, the adjusting body 4 can be moved on the throat plate 1 and locked at a desired position, so that several replacement pieces can be used to adjust the overlocking width of the overlocking claw 3 of the overlocking sewing machine. There is no need to prepare a throat plate; a throat plate with an extremely simple structure and suitable parts precision is sufficient. Also, the stitching width can be narrowed or widened with a single touch, so changing the stitching width takes less time. It is very effective in improving work efficiency.

As an embodiment of the present invention, two convex portions 8 and 9 are provided on the upper surface of the adjustment body 4 at an interval and protrude on a line parallel to the cloth feeding direction, and a leaf spring 11 is provided to cover these convex portions 8 and 9. Contact hands 12, 1 provided at both front and rear ends thereof.
3 presses these convex parts 8 and 9, and the adjustment body 4 moves to change the overlocking width of the overlock claw 3 into two widths, wide and narrow. is narrowed and protruded, and is pressed by a leaf spring having one contact hand that fits between the convex parts, and as the adjusting body 4 moves, the contact hand moves between the next convex parts. The overlocking width of the overlocking pawl 3 may be changed to a large number by fitting into the overlocking claw 3, and the leaf spring is provided with a large number of fitting holes corresponding to the many convex portions protruding on the adjustment body 4. As the adjustment body 4 moves, the convex portion of the adjustment body 4 may be fitted into the next fitting hole.

Further, even if the adjusting body 4 is provided with a recessed portion and the leaf spring 11 is provided with a convex portion, the same effect can be obtained in the above embodiment.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the back side of the throat plate of the present invention, and FIG. 2 is a partially omitted side view. In the figure, 1 is the throat plate, 3 is the overlock pawl, 4 is the adjustment body,
11 is a leaf spring.

Claims (1)

[Claims for Utility Model Registration] A needle that has needle thread and moves up and down through the needle groove of the throat plate in conjunction with the drive shaft, and a needle that moves up and down through the needle groove in the throat plate in conjunction with the drive shaft, and a needle that moves up and down in conjunction with the drive shaft under the needle plate. A throat plate provided with a looper for forming an overlock seam on the edge, and an overlock claw 3 that extends away from the needle drop point toward the fabric edge and parallel to the fabric feeding direction so as to define the overedge width to be formed on the fabric edge. In an overedge sewing machine having a cloth feeding direction, a plurality of locking portions extending along the cloth feeding direction and having a tapered tip and appearing and recessed on the upper surface of the intermediate portion are provided at intervals on a line parallel to the cloth feeding direction, and An adjusting body 4 whose tip is in contact with the side surface of the overlock claw and supported on the throat plate so as to be movable back and forth along the cloth feeding direction, and an adjusting body 4 whose base is fixed to the throat plate and whose free end is pressed against the adjusting body. A throat plate for an overcut sewing machine, which is provided with a leaf spring 11 having elasticity that presses against the throat plate and engages with a locking part of the adjuster to press and lock the adjuster against the throat plate.