JPH0531270A - Edge darning sewing machine white can adjust darning width - Google Patents

Abstract

PURPOSE:To obtain desired darning width by only adjusting an operating body by varying darning width of thick width by moving a moving claw in the cloth feeding direction, separating the moving claw from a seam forming position, and setting darning width of thin width by only a fixed claw. CONSTITUTION:When a darning width adjustment dial 16 is adjusted so as to become desired darning width, a lever 10 turns by following its cam face 15, a moving claw 5 moves forward and backward and its position is determined. In such a manner by a tapered shape of the tip part of the moving claw 5 and a fixed claw 2, darning width is set, and sewing by its darning width can be executed. When the darning width adjustment dial 16 is furthermore turned, and the moving claw 5 is moved to the retreat end, the tip of the moving claw 5 is detached from a needle location position, and the edge darning of narrow width such as lapping seam by only the fixed claw 2 can be executed. Also, the moving claw 5 does not move in the direction being orthogonal to the cloth feeding direction, therefore, there is no fear that it interferes with a looper, etc.

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, when performing sewing of narrow overlock width such as winding stitch, the movable claw is brought to the lower position of the lower knife holder and only the fixed claw is provided. The operation of turning on must be performed in addition to the operation of reducing the overedging width, and there is a problem that work efficiency is reduced and work efficiency is reduced. Further, if the moving claw is mistakenly brought to a position below the lower knife holder during the operation of the sewing machine, the moving claw may collide with an internal mechanism such as a looper on the locus, which may cause the mechanism to be broken. There was a point. The present invention has been made to solve the above problems, and an object of the present invention is to obtain a desired overedging width only by an operator adjusting an operating member such as an overedging width adjusting dial, and to sew a seam. It is an object of the present invention to provide an overedging sewing machine capable of adjusting the overedging width such that a desired overedging width can be obtained by the same operation when sewing a narrow overedging width such as the above.

[0004]

In order to achieve the above object, according to the present invention, a needle which has a needle thread and moves up and down through a needle groove of a needle plate in conjunction with a drive shaft, and a lower needle plate. An edge having a looper that cooperates with the drive shaft to form an overlock stitch on the cloth end in cooperation with the needle, and a knife that cuts the cloth end and is positionally adjustable in a direction intersecting the cloth feeding direction. In the overlock sewing machine, a narrow fixed claw that is integrally formed with the needle plate and that extends in the cloth feed direction and sets a narrow overlock width such as winding stitches; and the fixed claw that is formed separately from the needle plate. Moving claws that are arranged in parallel and set a wide overlock width, and the moving claw has a tapered shape that changes the amount of the overlock width in accordance with the back-and-forth movement of the moving claw in the cloth feeding direction; Move the moving claw back and forth in the cloth feeding direction to change the amount of overedging width and Darning width adjustable overedge sewing machine, characterized in that it comprises a driving means having an operation member to allow setting the darning width only by the fixed pawl is disengaged from the stomach first forming position are provided.

[0005]

In the overedging sewing machine having the above-described adjustable overhang width, the moving claw is not moved in the direction orthogonal to the cloth feeding direction by the driving means by adjusting the operating body,
Move back and forth in the cloth feed direction. Since the moving claw has a tapered shape, the width at the stitch forming position changes depending on the position in the front-back direction. Further, if the moving claw is removed from the stitch forming position, sewing is performed only with the fixed claw. Since the moving claw does not move in the direction orthogonal to the cloth feeding direction, there is no risk of interfering with the looper or the like.

[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 and the fixed claw 2, and the pressing load is supported by the needle plate 1 and the fixed claw 2. For this reason, the moving claw 5 has the needle plate 1
Need not be kept flush with. Even if the moving claw 5 is protruding above the needle plate 1, the moving claw 5 formed of an elastic member can be lowered to the upper surface of the needle plate 1 by the load of the cloth presser, which causes no trouble in feeding the cloth. Absent.

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, the movable claw adjacent to the fixed claw is moved back and forth in the cloth feeding direction to adjust the overedging width. The operator can obtain the desired overedging width only by adjusting the operating body, and the desired overedging width can be obtained by the same operation without any special operation when sewing narrow overedging width such as winding stitches. It has an excellent effect. Also, when adjusting the overedging width, there is no member that moves the moving claws only in the front-back direction and moves downward in the needle plate, so it does not hinder operations such as threading the looper, Even if the overlock stitch of wide width is erroneously switched to the overlock stitch of narrow width such as roll stitch, the moving claw does not interfere with the internal mechanism of the sewing machine, so that the sewing machine is not likely to be broken.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of an overlock 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 an overlock sewing machine having a looper that works to form an overlock stitch on the cloth end and a knife that is provided to adjust the position in a direction intersecting with the cloth feeding direction and cuts the cloth end, the sewing machine is integrally formed with a needle plate. And a narrow fixed claw that is extended in the cloth feeding direction and sets a narrow overlock width for winding stitches and the like, and is formed separately from the needle plate and arranged in parallel with the fixed claw to increase the wide overlock width. The moving claw to be set, the moving claw having a tapered shape that changes the amount of the overedging width in accordance with the back and forth movement of the moving claw in the cloth feeding direction; , The amount of overedging width is changed, and the moving claw is removed from the seam forming position, Darning width adjustable overedge sewing machine, characterized in that it comprises a driving means having an operation member to allow setting the darning width only fingernail.