JPH0531272A - Edge darning sewing machine which can adjust draning width - Google Patents

Abstract

PURPOSE:To obtain desired darning width by providing the fixed claw of thin width for setting darning width of thin width and a moving claw being an elastic material for setting darning width of thick width. CONSTITUTION:A fixed claw 2 is a member of thin width of a roughly needle- like shape, and extended and provided in the cloth feeding direction. A moving claw 5 is formed by a sheet metal-like elastic member and in the rear end, a shaft 6 is caulked and the tip part 5A is extended out to the left, and thereafter, bent upward, and consists of a shape extended out forward. By adjusting a turning position of a darning width adjustment dial 16, advance and retreat positions of the moving claw 5 are adjusted. The darning width adjustment dial 16 constitutes an operating body for varying the amount of darning width, and a lever 10, a torsion coil spring 12, a cam follower 13 and a cam face 15, etc., constitute a driving means for varying the amount of darning width. When the darning width adjustment dial 16 is rotated with hand fingers and the moving claw 5 is retreated, width of the tip part 5A of the moving claw 5 becomes smaller stepwise, and edge darning of the narrowest width by only the fixed claw 2 is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overedged sewing machine having an adjustable overedging width.

[0002]

2. Description of the Related Art Conventionally, in the overedging machine, the overedging width, which is the width of the overedging seam, is influenced by the width of the claws on the needle plate side. It was necessary to replace the needle plate with a claw, which was troublesome and resulted in a decrease in work efficiency. In order to eliminate this defect, a fixed claw that sets a narrow overhang width such as winding stitch is set on the cloth end side of the needle drop point of the needle plate, and it moves adjacent to the fixed claw in the direction orthogonal to the cloth feed direction. It has been proposed to change the amount of overlock width by means of movable claws (Jitsuko Sho 63-21254).

[0003]

However, in the above-mentioned conventional device, the overedging width, which is the width of the stitch of the overedging, is set by the position of the moving claw, and the upper surface of the moving claw and the upper surface of the needle plate are accurately aligned. Had to be on a plane. However, since the moving claw is not a member fixed to the throat plate, there is a problem that it takes a lot of time to adjust the moving claw and the work efficiency is lowered. The present invention has been made to solve the above problems, and the object thereof is to obtain a desired overhanging width only by adjusting and moving the moving claw, and the operator can adjust the height of the moving claw. The object is to provide an overedger with an adjustable overedging width, which does not need to be performed.

[0004]

In order to achieve the above object, in the present invention, as illustrated in the drawings of the embodiments, a needle thread is held and the needle shaft passes through the needle groove of the needle plate 1 in conjunction with the drive shaft. The needle 32 that moves up and down and the needle 32 that interlocks with the drive shaft under the needle plate 1.
Looper 3 that cooperates with the fabric to form overlock seams on the edge of the fabric
3 and an overedge sewing machine having knives 27 and 30 for cutting the cloth end, the position of which is adjustable in a direction intersecting with the cloth feeding direction, in an overedge sewing machine which is integrally formed with the needle plate 1 and extends in the cloth feeding direction. The fixed claw 2 having a narrow width for setting a narrow overlocking width such as rolled seams, and the fixed claw 2 formed separately from the needle plate 1.
And moving claws 5 arranged in parallel with each other to set a wide overwidth,
The moving claw 5 is formed of a plate member made of an elastic material, and an overedging sewing machine with an adjustable overedging width is provided.

[0005]

In the overedging machine with the adjustable overhanging width constructed as described above, the fixed claw 2 is formed integrally with the needle plate 1, so that the upper surface of the fixed claw 2 and the upper surface of the needle plate 1 are accurately arranged. It is easy to finish it into one plane, and no operator adjustment is required. Then, the cloth can be sandwiched between the needle plate 1 and the fixed claw 2 having a narrow width, and the load of the cloth press can be supported by the needle plate 1 and the fixed claw 2 having a narrow width. The upper surface of the needle plate 1 does not have to be exactly aligned. Moving claw 5
Even if the upper surface of the needle plate 1 is above the needle plate 1, the moving claw 5 formed of a plate member made of an elastic material is pushed down to the upper surface of the needle plate 1 by the load of the cloth presser.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a main part of the overedging width adjusting mechanism. A fixed claw 2 is fixed to and integrated with the needle plate 1 near the needle drop position. The fixed claw 2 is a narrow needle-shaped member, and extends in the cloth feeding direction.

A guide groove 3 is formed on the back surface of the needle plate 1, and a rectangular opening 4 is provided near the fixed claw 2. A moving claw 5 is arranged so that its tip is projected from the opening 4 by being guided by the guide groove 3. The moving claw 5 is formed of a thin plate-like elastic member, a shaft 6 is caulked at the rear end, and the front end portion has a shape extending leftward and then bending upward and extending forward. The tip of the moving claw 5 is formed in a taper shape in three steps. The moving claw 5 is a guide groove 3
With the claw retainer 7 inserted and engaged with the
The movable claw 5 is slidable in the front-back direction (cloth feed direction).

A substantially L-shaped lever 10 that engages with a shaft 6 at the rear end of the moving claw 5 is swingably supported by a swing shaft 11 on a machine frame (not shown). A torsion coil spring 12 is arranged so as to be fitted into the swing shaft 11. One of the hooks 12A of the torsion coil spring 12 is engaged with the tip 10A of the lever 10 by sandwiching the shaft 6, and the other hook 12B is engaged with a machine frame (not shown).
Therefore, the lever 10 is biased by the torsion coil spring 12 in the clockwise direction, that is, in the direction of moving the moving claw 5 forward. A cam follower 13 composed of an eccentric shaft is screwed to the other end of the lever 10 and fixed by a nut 14. The cam follower 13 has a screw shaft 13 as its sliding surface.
It is eccentric with respect to A. By appropriately adjusting the position of the screw shaft 13A and fixing it with the nut 14, the position of the cam follower 13 can be finely adjusted.

On the other hand, an overlocking width adjusting dial 16 having a substantially cylindrical cam surface 15 at its core is rotatably supported by a rotating shaft 17 on a machine frame (not shown). A spring washer 18 is fitted on the rotating shaft 17, and the swivel width adjusting dial 1
Friction is given to the rotation of 6. Cam follower 1
3 is the cam surface 1 due to the biasing force of the torsion coil spring 12.
It is pressed against 5 and its position is regulated. Therefore, by adjusting the turning position of the overedging width adjusting dial 16, the forward / backward moving position of the moving claw 5 is adjusted. That is, the overedging width adjusting dial 16 constitutes an operating body for changing the amount of overedging width, and the lever 10, the torsion coil spring 12, the cam follower 13, the cam surface 15 and the like form a driving means for changing the amount of overedging width.

FIG. 2 is an enlarged plan view showing the vicinity of the needle drop position, and FIG. 3 is a side view. The fixed claw 2 having a substantially needle shape is installed adjacent to the needle drop position so as to extend in the cloth feeding direction. Further, the tip portion 5 of the moving claw 5 is adjacent to the fixed claw 2.
A is provided. The illustrated position shows the most advanced position of the moving claw 5, and is the case where the widest overedging is performed. When the overlock width adjusting dial 16 is rotated by a finger to move the moving claw 5 backward, the width of the tip 5A of the moving claw 5 gradually decreases, and finally the tip of the moving claw 5 retracts from the needle drop position. The narrowest overedging using only the fixed claw 2 is performed.

FIG. 4 is a plan view showing the needle plate portion, FIG. 5 is a front view, and FIG. 6 is a side view. The needle plate 1 is provided with a tip portion 5A of the moving claw 5 adjacent to the fixed claw 2. Referring to FIG. 5, the swing shaft 11 is rotatably supported by the machine frame 20, and the swing shaft 11 supports the lever 10 so as to swing. A torsion coil spring 12 is provided at the center of the lever 10 for swinging the shaft 1.
1, the coil portion is fitted and disposed, one end 12B of the hook portion is locked to the machine frame 20, and the moving claw 5 is attached to the other end 12A.
The caulked shaft 6 is pressed. A cam follower 13 composed of an eccentric shaft is screwed to the lower end of the lever 10 and fixed by a nut 14. The cam follower 13 is in sliding contact with the cam surface 15 of the overedging width adjusting dial 16.

Machine frame 2 above the overedging width adjusting dial 16
A fixed shaft 21 is fixed to 0, and a link lever 23 is swingably supported by a pin 22 fixed to the tip of the fixed shaft 21. A cam follower 24 is provided at the lower end of the link lever 23, and comes into contact with and slides on a side surface cam formed on the left side surface of the overedging width adjustment dial 16. The upper end of the link lever 23 contacts the sliding shaft portion 25A of the female holder 25. A compression spring 26 is inserted into the sliding shaft portion 25A of the knife holder 25 to bias the sliding shaft portion 25A of the knife holder 25 to the left in the drawing.

The knife holder 25 is a member in which a block portion 25B is integrally formed at the tip of a sliding shaft portion 25A.
As shown in, the lower shoulder 27 is attached to the block portion 25B. In addition, the block portion 25 of the knife holder 25
At one end of B, a detent 29 integrated with the machine frame 20 is engaged with the U-shaped groove 28 to prevent the female holder 25 from rotating. An upper leg 30 connected to a known mechanism is disposed in the vicinity of the lower leg 27 fixed to the knife holder 25, and cooperates with the lower leg 27 to cut the cloth edge of the work cloth. Further, at the needle drop position of the needle plate 1, the sewing machine needle 32 attached to the needle bar 31 obliquely drops. Looper 3 near the dropped sewing needle 32
3 sword tips may be located.

The operation will be described based on the above configuration. When the operator adjusts the overedging width adjusting dial 16 so as to have a desired overedging width, the overedging width adjusting dial 1
The lever 10 is rotated by following the cam surface 15 of 6, and the moving claw 5 is moved back and forth to determine its position. When the position of the moving claw 5 is determined, the overhanging width is set by the tapered shape of the tip of the moving claw 5 and the fixed claw 2, and sewing is executed with the set overhanging width. When the overlocking width adjusting dial 16 is further turned to move the moving claw 5 to the retracted end, the tip of the moving claw 5 is disengaged from the needle drop position, and winding sewing using only the fixed claw 2 is executed.

Since the needle plate 1 and the fixed claw 2 are integrally formed, it is relatively easy to make the upper surface of the fixed claw 2 flush with the needle plate 1. Therefore, the work cloth is sandwiched between the cloth presser, the fixed claw 2 and the needle plate 1, and the pressing load is supported by the needle plate 1 and the fixed claw 2. Therefore, the moving claw 5 does not need to be held on the same plane as the needle plate 1. for example,
Even if the moving claw 5 is projected above the needle plate 1, the moving claw 5 formed of a plate member made of an elastic material can be lowered to the upper surface of the needle plate 1 by the load of the cloth retainer, so that there is no problem in feeding the cloth. Does not occur.

In the embodiment described above, the width of the tip portion 5A of the moving claw 5 is gradually reduced.
The shape of A may be a substantially triangular shape in which the width is continuously reduced.

[0017]

According to the present invention, since the moving claw adjacent to the fixed claw is formed of a plate member made of an elastic material and has the above-described structure, the height adjustment of the moving claw is not required to be accurate, and the overhang is prevented. There is an excellent operability in that the operator can adjust the width adjustment dial to obtain a desired overedging width.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of an overlocking width adjusting mechanism.

FIG. 2 is an enlarged plan view showing the vicinity of the needle drop position.

[Figure 3] Side view

FIG. 4 is a plan view showing a needle plate portion.

[Figure 5] Front view

FIG. 6 Side view

[Explanation of symbols]

 1 Needle plate 2 Fixed claw 5 Moving claw 7 Claw presser 10 Lever 12 Torsion coil spring 13 Cam follower 15 Cam surface 16 Overlock width adjustment dial 20 Machine frame

Claims (1)

Claim: What is claimed is: 1. A needle, which has a needle thread and moves up and down by passing through a needle groove of a needle plate in association with a drive shaft, and a needle which interlocks with the drive shaft under the needle plate and cooperates with the needle. In a edging machine having a looper that works to form an overlock stitch on the cloth end and a knife that cuts the cloth end and is positionally adjustable in a direction intersecting the cloth feed direction, is integrally formed with a needle plate. And fixed nails that are extended in the cloth feeding direction and set a narrow overlock width for winding stitches and the like, and a thick overlock width that is formed separately from the needle plate and is parallel to the fixed hooks. The moving claw to be set and the moving claw are
An edge stitch sewing machine capable of adjusting an overedging width, comprising: a plate member made of an elastic material.