JPH0349651Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention allows the cut edge of the fabric to be folded back and wrapped without replacing the throat plate, and can also be used for ordinary overlock stitching without folding back the cut edge. This invention relates to a winding stitch switching device for a lock sewing machine.

[Conventional technology and issues]

The lock sewing machine is capable of wrapping stitches by significantly reducing the width of the stitch claw adjacent to the needle hole. Therefore, a lock sewing machine that can be used for both wrapping stitches and ordinary overlocking stitches has a stitching pawl divided into two parts: a wrapping sewing pawl fixed to the throat plate and an auxiliary pawl. The auxiliary claw can approach the winding claw, and
It has a structure that allows it to be separated from the winding claw. The auxiliary nail is sewn with the auxiliary nail separated from the sew-on nail, and the auxiliary nail is brought close to the sew-on nail, and both nails are used as wide stitching nails to perform normal overlock stitching.

As a device for separating the auxiliary claw from the winding claw, a second
As shown in the figure, a mechanism has been developed that moves the auxiliary claw 1 and the winding claw 2 horizontally (Jitsukai Sho.
59-125380).

However, this structure has the disadvantage that the auxiliary claw cannot be moved from the winding claw 2 unless the looper is in a standby state at a specific position, making it inconvenient to use. This is because the movement path of the auxiliary claw 1 and the movement path of the looper intersect.

In addition, as another structure, as shown in Figure 3,
A mechanism for retracting the auxiliary claw 1 diagonally downward and separating it from the winding claw 2 has also been developed (Utility Model No. 56-30875).
(Japanese Utility Model Publication No. 59-67169).

However, since the auxiliary pawl of this structure is also separated from the winding pawl through the movement path of the looper, there is a drawback that the auxiliary pawl cannot be moved unless the looper is retracted to a specific position.

That is, in both mechanisms, it is necessary to move the auxiliary claw after the looper is placed on standby at a predetermined position, and there is a drawback that not everyone can move the auxiliary claw easily and reliably.

Further, since the movement paths of the looper and the auxiliary pawl intersect, if the looper is moved without moving the auxiliary pawl to a regular position, either the looper or the auxiliary pawl may be damaged, causing a malfunction. The looper requires extremely high precision. Therefore, if this deforms when it comes into contact with the auxiliary claw, it will malfunction and become unusable.

Furthermore, a lock sewing machine has been developed which has a mechanism in which the auxiliary claw is horizontally retracted and separated from the winding claw (Japanese Patent Publication No. 57-43274). The winding stitch switching device of this lock sewing machine is shown in FIG. The device shown in this figure has a structure in which the auxiliary claw 1 is moved back in front of the lower knife 5. In other words, the auxiliary claw 1 is moved back and forth in front of the lower knife 5 to switch between winding stitches and overlock stitches.

A lock sewing machine with this structure has the disadvantage that it is difficult to sew cloth with curved edges neatly by making small turns with a small radius of curvature. That is lower scalpel 5
Since the auxiliary claw 1 is moved back and forth in front of the lower knife 5, there is a "space for the auxiliary claw 1 to move back and forth" in front of the lower knife 5.
This is because the lower knife must be located relatively rearward. That is, when the lower knife 5 is retracted and disposed, the lower knife 5 separates from the sewing needle. If the lower knife and sewing needle are separated, the fabric will be cut by the lower knife and then transported a long distance before being sewn. If the direction of movement of the fabric is changed during that time, the cutting position and sewing position will shift. Put it away.

For this reason, it is required that the positions of the lower knife and the sewing needle be as close as possible. A lock sewing machine in which the two are close to each other has the advantage that the cutting position and the sewing position of the cloth are close to each other, and the cut cloth is sewn immediately, so it can be sewn neatly with small turns.

This invention was developed with the aim of solving the drawbacks of conventional lock sewing machines.The important purpose of this invention is that the auxiliary claw can be moved freely regardless of the position of the looper, making it easy for anyone to use. To provide a winding stitch switching device for a lock sewing machine which can switch to a winding stitch state and easily change from winding stitching to ordinary overlocking stitch.

Another important purpose of this invention is that even if the looper is moved while the auxiliary jaw is moving, neither the looper nor the auxiliary jaw will be damaged, and the number of failures due to operational errors can be reduced. To provide a sewing switching device.

Furthermore, an important object of this invention is to provide a winding and sewing switching device for a lock sewing machine that allows the sewing position and cutting position to be brought close to each other even though the auxiliary claw can be moved back and forth.

[Means for solving problems]

The winding stitch switching device for a lock sewing machine of this invention has the following configuration in order to achieve the above-mentioned object.

(a) The winding and sewing switching device includes a winding and sewing claw 2 and an auxiliary claw 1.

(b) The winding claw 2 is disposed adjacent to the needle hole and extending in the cloth feeding direction.

(c) The auxiliary claw 1 is arranged parallel to and adjacent to the wrapping stitch claw 2.

(d) The auxiliary claw 1 is located adjacent to the wrapping stitch claw 2 and the lower knife 5.
It is arranged so that it can move back and forth horizontally parallel to the cloth feeding direction between the normal position and the rear position.

(e) The auxiliary claw 1 is locked at a position adjacent to the wrapping sewing claw 2 and at a position rearward of the lower knife 5 by a locking member.

(f) Furthermore, the lower knife 5 is attached to the sewing machine via attachment means.

(g) The means for attaching the lower knife 5 is to attach the lower knife 5 to the auxiliary claw 1.
It is held movably from a fixed position within the movement path to outside the movement path.

(h) The auxiliary claw 1 can move forward and backward only when the lower knife 5 is outside the movement path of the auxiliary claw 1.

(i) The attachment means for the lower knife 5 includes a moving shaft that holds the lower knife 5 at the tip, a coil spring that is a push spring that elastically pushes out the moving shaft, and a stopper that locks the moving shaft at a predetermined position. It is equipped with

(j) The moving shaft is pivotally supported so as to be movable left and right in a through hole drilled in the sewing machine body, extending in the left and right directions and extending in the horizontal direction.

(k) The stopper 24 is arranged so as to be movable forward and backward perpendicular to the moving shaft 22.

(l) It is constructed so that the auxiliary claw 1 is moved back from the normal position of the lower knife 5 to perform winding stitches, and the auxiliary claw 1 is brought close to the winding sewing claw 2 to perform over-edge stitching without rolling the edge of the fabric. ing.

[Effect]

The winding stitch switching device of the lock sewing machine of this invention is used in the following conditions.

The auxiliary nail is moved to a position adjacent to the wrapping sewing nail, and the auxiliary nail and the wrapping sewing nail constitute a wide stitching nail.

In this state, do a normal overlock stitch without folding back the cut edge.

The lower knife 5 is moved out of the path of the auxiliary claw 1.

Separate the auxiliary claw from the winding claw. In this state, the stitching claws consist only of rolled stitching claws,
The width becomes narrower. Use a narrow stitching nail to sew around the stitches.

Return the lower knife to its normal position.

When moving the auxiliary claw 1 back and forth, use the lower knife 5.
To move it out of the path of the auxiliary claw 1, proceed as follows.

The stopper 24 is released to make the moving shaft 22 movable.

The lower knife 5 is moved out of the path of the auxiliary claw 1 by pressing the moving shaft. In this state, the auxiliary claw 1 is moved back and forth.

After moving the auxiliary claw 1, the moving shaft 22 is returned to its original position, and the moving shaft is stopped by the stopper 24.

[Preferred embodiment]

Hereinafter, embodiments of this invention will be described based on the drawings. However, the embodiment shown below is an example of a winding and stitching switching device for embodying the technical idea of this invention, and the winding and stitching switching device of this invention has various characteristics such as material, shape, structure, etc. of the component parts. The arrangement is not limited to the following structure. The winding and sewing switching device of this invention is
Within the scope of the claim for utility model registration,
Various changes are made.

Furthermore, in order to make it easier to understand the scope of claims for utility model registration, this specification includes numbers corresponding to the members shown in the examples in the "column of claims for utility model registration",
Additional notes are added to the members shown in the "Prior Art and Problems" and "Means for Solving Problems" columns. However, the parts indicated in the scope of the utility model registration claim,
It is by no means specific to the members of the embodiment.

The winding device of the lock sewing machine shown in FIG. 1 and FIG. and a lower knife 5 attachment means for laterally moving the lower knife 5.

The auxiliary claw 1 is a winding sewing claw 2 shown by a solid line in FIG.
It is attached to the throat plate 3 so that it can be stopped at a position adjacent to the needle plate 3 and can be moved back to the position shown by the chain line in FIG.

The auxiliary claw 1 is placed in the position shown by the chain line in FIG.
The wrapping stitch is performed in a state where it is separated from the wrapping sewing nail 2, and when the auxiliary nail 1 is placed at the solid line position close to the wrapping sewing nail 2, normal hem oversewing is performed without rolling the edge of the fabric.

The mechanism by which the auxiliary claw 1 moves back and forth is shown in FIGS. 1, 4, and 5. As shown in these drawings, the throat plate 3 is provided with a guide groove 6 on the rear lower surface of the winding claw 2 that extends back and forth and has a narrow opening. A base 7 of the claw 1 is fitted so as to be slidable in the horizontal direction.

The auxiliary claw 1 and the base 7 are such that when the base 7 slides along the lower surface of the throat plate 3 and is pushed forward most, the upper surfaces of the auxiliary claw 1 and the winding claw 2 are on the same plane. , and the auxiliary claw 1 is connected to the winding stitch claw 2 so as to be adjacent to the same.

A knob 8 is fixed to the base 7 of the auxiliary claw 1 horizontally and extending to the right, and the base 7 is moved back and forth by holding the knob 8.

As shown in FIG. 4, there is a knob 8 on the side of the throat plate 3.
If a mark 9 indicating the stop position is attached, the knob 8 can be definitely stopped at the normal position.

The base 7 is stopped by a locking member at a position where the auxiliary claw 1 is pushed out to a position adjacent to the winding claw 2. In FIG. 4, the locking member of the base 7 is a leaf spring 10 extending and fixed to the lower surface of the guide groove 6. As shown in FIG. The front end of the leaf spring 10 is U-bent and elastically presses the lower surface of the base 7. A recess 11 is formed in the front part of the lower surface of the base 7, into which the U-curved portion of the leaf spring 10 is fitted, with the auxiliary claw 1 being pushed out to a fixed position adjacent to the winding claw 2.

The U-shaped portion of the leaf spring 10 is fitted into the recess 11 of the base 7, and the base 7 is locked.
is stopped in place.

In FIG. 4, the leaf spring 10 is provided with U-curved portions at both ends, and the U-curved portion at the rear end is connected to the retracted base 7.
Free movement of the base 7 is stopped by elastically pressing the lower surface.

Other specific examples of the locking member interposed between the base 7 and the guide groove 6 are shown in FIGS. 6 and 7.

The locking member in FIG. 6 is a leaf spring 12 mounted on the base 7. The leaf spring 12 has a J-shape as a whole, and its upper end is a stopper in a recess 14 provided on the lower surface of the base 7. It is fitted into the hole 13, and the other end is in contact with the bottom of the recess 14 so as to be able to move to some extent so that the lower part can be deformed and press against the surface of the guide groove 6.

In the guide groove 6, when the auxiliary claw 1 is pushed out to a position adjacent to the winding claw 2, the locking recess 15 into which the lower surface of the leaf spring 12 is fitted and locked is located on the sliding surface of the leaf spring 12. It is set in.

The locking member shown in FIG. 7 consists of a ball 16 disposed on the lower surface of the base 7 and a push spring 17 that pushes out the ball 16. The ball 16 and the push spring 17 are arranged in a recess 18 provided on the lower surface of the base 7, and the ball 16 is elastically pressed against the guide groove 6 by the push spring 17.

Similar to the guide groove 6 in FIG. 6, this guide groove 6 is fitted with a ball 16 to lock the base 7 when the auxiliary claw 1 is moved to a fixed position adjacent to the winding claw 2. A locking recess 19 is provided at the position.

The means for attaching the lower knife is the lower knife 5 in Figure 1.
is attached to the sewing machine body while being moved from the solid line position to the chain line position in FIG.

The attachment means for the lower knife 5 includes a moving shaft 22 inserted into a through hole 21 formed in the sewing machine body 20 on both sides and extending horizontally, and a coil that is a push spring that elastically pushes out the moving shaft 22. Spring 23
and a stopper 24 that locks the moving shaft 22 at a predetermined position.

The through hole 21 of the sewing machine body is formed to be thicker on the side where the lower knife 5 is attached and slightly thinner on the opposite side so that the coil spring 23 can be inserted between the through hole 21 and the moving shaft 22.

The moving shaft 22 has a lower knife 5 fixed to its tip via a fixing plate 25, has a knob 26 at its rear end, and has a somewhat thicker cylindrical front portion, and this thicker portion is connected to a coil spring 23. A coil spring 23 is interposed between the outer periphery of the intermediate thin portion and the through hole 21 so as to press it.

A locking groove 27 in which a stopper 24 can be locked is provided in the rear end of the moving shaft 22 in the circumferential direction.

As shown in FIG. 8, the stopper 24 has a width that allows it to fit into the locking groove 27, and as shown in FIG.
A semicircular recess 29 into which the holder can be fitted is provided, and the holder is disposed so as to be able to move forward and backward perpendicularly to the moving axis 22.

The width of the U-shaped notch 28 is set so that when the stopper 24 is pulled, the moving shaft 22 is pushed out by the coil spring 23.
It is determined to be larger than the outer shape of 0.

The rear end of the moving shaft 22 further from the sliding cylinder 30 is U.
It is formed to be thicker than the width of the character-shaped notch 28, and the movement axis 22
Limit the amount of extrusion. Therefore, the sliding cylinder 30
The length of determines the amount of movement of the lower knife 5. Therefore, the length of the sliding cylinder 30 is determined to be longer than the width of the auxiliary claw 1, and the lower knife 5 is separated from the throat plate wider than the width of the auxiliary claw 1.
The auxiliary claw 1 is moved back and forth to switch between winding stitching and normal stitching.

As shown in FIG. 9, the stopper 24 slides back and forth in a guide hole 31 bored in the sewing machine body 20, and has a pin 32 fixed to its upper end that passes through the sewing machine body 20. A stopper 24 is connected to the sewing machine main body 20 via a tension spring 33.
is always being pulled elastically.

The attachment means for the lower knife 5 shown in FIGS. 8 and 9 are as follows:
By pulling the rear end of the stopper 24, the lower knife 5 can be moved to the right. In this state, the auxiliary claw 1 is moved back and forth to switch the overlocking state. After moving the auxiliary claw 1 to a predetermined position, the lower knife 5 is pulled to the position shown in FIG. 8 by pushing the lower knife 5 to the left or pulling the knob 26 at the rear end of the moving shaft 22. It will be returned. At this time, the semicircular recess 2 of the stopper 24
9 is fitted into the locking groove 27 of the moving shaft 22, and the movement of the lower knife 5 is stopped.

Furthermore, the moving shaft 22 in FIG. 8 has a knob 26 at the rear end.
The lower knife 5 is divided into two parts, a front shaft 22A and a rear shaft 22B, so that the position of the lower knife 5 can be adjusted to some extent by turning the lower knife 5.

The front shaft 22A has a female screw hole extending in the axial direction from the center of the rear end, and the rear shaft 22B has a male screw 34 screwed into the female screw hole at the center of the tip.

Further, the front shaft 22A is provided with a slit 35 so that it can move in the axial direction without rotating.
This slit 35 is slidably fitted into a guide 36 that is horizontal to the sewing machine main body 20 and extends left and right.

When the knob 26 is rotated to the right, the male screw 34 of the rear shaft 22B is screwed into the female screw of the front shaft 22A, and the lower knife 5 can be moved to the left, and when the knob 26 is rotated in the opposite direction, the lower knife 5 can be moved to the right.

[Effect of idea]

The noteworthy features of this invented winding and sewing switching device are:
To make it possible to neatly sew the cloth along a cut edge with a small radius of curvature by turning the cloth in a small direction when oversewing a cloth having a curved edge. it is,
This is because the auxiliary claw can be moved further back than the lower knife when performing winding stitches.

When retracting the auxiliary claw, the lower knife is kept waiting outside the path of the auxiliary claw. The winding and stitching switching device with this structure does not require a long space in front of the lower knife to move the auxiliary claw back and forth, unlike conventional lock sewing machines. Therefore, the lower knife can be placed close to the front sewing needle. In other words, the sewing needle and lower knife can be brought closer together. A lock sewing machine in which the sewing needle and the lower knife are close to each other can sew the cloth with the sewing needle immediately after cutting the cloth with the lower knife, and the cutting position and the sewing position can be brought close to each other. Therefore, the winding and stitching switching device of the lock sewing machine of this invention realizes the feature that even if the fabric is rotated in a small direction, it can be sewn neatly along the cut edge.

Furthermore, the winding stitch switching device of the lock sewing machine of this invention moves the auxiliary claw back and forth in the horizontal direction,
You can switch between "rolling stitch" and "overlock stitch". The auxiliary pawl moved in this direction does not intersect the reciprocating path of the looper. Therefore, the winding and stitching switching device of the lock sewing machine according to the present invention does not require the looper to be kept in standby at a specific position when moving the auxiliary claw, unlike the conventional method.

In addition, the winding and sewing switching device of this invention prevents the looper and needle from colliding even when the lower knife is moved from the sewing position or when the auxiliary claw is stopped in the middle of movement and the looper and needle are moved. . For this reason, the winding and sewing switching device allows anyone to easily and easily change the position of the auxiliary claw, and even in the unlikely event of an operational error,
There is no damage caused by the looper or auxiliary claws hitting each other.
It has the features of being safe and convenient to use.

Furthermore, the winding and sewing switching device of this invention realizes the feature that the lower knife can be easily moved out of the path of the auxiliary claw and can also be stopped at a fixed position. it is,
This is because the moving shaft to which the lower knife is attached is pressed by a coil spring, and the moving shaft is stopped at a fixed position by a stopper that can move vertically back and forth.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a throat plate showing an embodiment of this invention, Figs. 2 and 3 are a side view and a plan view of a conventional winding and stitching switching device, and Fig. 4 is a plan view of a throat plate with an auxiliary pawl. A side view, FIG. 5 is a sectional view taken along the - line in FIG. 4,
6 and 7 are partially sectional side views of the throat plate showing other embodiments, FIGS. 8 and 9 are horizontal sectional views and back views showing the means for attaching the lower knife, and FIG. 10 is the conventional FIG. 2 is a plan view showing a winding/stitching switching device of the lock sewing machine. 1... Auxiliary claw, 2... Winding claw, 3... Throat plate, 4
...Needle hole, 5...Lower knife, 6...Guide groove, 7...
... Base, 8 ... Knob, 9 ... Mark, 10 ... Leaf spring, 11 ... Recess, 12 ... Leaf spring, 13 ...
Stopping hole, 14... recess, 15... locking recess, 16...
...Ball, 17...Press spring, 18...Concave, 19...
Locking recess, 20... Sewing machine body, 21... Through hole, 22... Moving shaft, 23... Coil spring, 24... Stopper, 25... Fixed plate, 26...
...Knob, 27...Latching groove, 28...U-shaped notch,
29...Semicircular recess, 30...Sliding cylinder, 31...
Guide hole, 32...pin, 33...tension spring, 3
4...male thread, 35...slit, 36...guide.

Claims (1)

[Claims for Utility Model Registration] The winding and stitching switching device of the lock sewing machine has the following configuration. (a) The winding and sewing switching device includes a winding and sewing claw 2 and an auxiliary claw 1. (b) The winding claw 2 is disposed adjacent to the needle hole and extending in the cloth feeding direction. (c) The auxiliary claw 1 is arranged parallel to and adjacent to the wrapping stitch claw 2. (d) The auxiliary claw 1 is located adjacent to the wrapping stitch claw 2 and the lower knife 5.
It is arranged so that it can move back and forth horizontally parallel to the cloth feeding direction between the normal position and the rear position. (e) The auxiliary claw 1 is locked at a position adjacent to the winding sewing claw 2 and at a position rearward of the lower knife 5 by a locking member. (f) Furthermore, the lower knife 5 is attached to the sewing machine via attachment means. (g) The means for attaching the lower knife 5 is to attach the lower knife 5 to the auxiliary claw 1.
It is held movably from a fixed position within the movement path to outside the movement path. (h) The auxiliary claw 1 can move forward and backward only when the lower knife 5 is outside the movement path of the auxiliary claw 1. (i) The lower knife 5 is attached by means of a moving shaft 22 that holds the lower knife 5 at its tip, and a coil spring 23 that is a push spring that elastically pushes out the moving shaft 22.
and a stopper 2 that locks the moving shaft at a predetermined position.
4. (j) The moving shaft 22 is pivotally supported so as to be movable left and right in a through hole 21 that extends in the left and right directions of the sewing machine body and extends in the horizontal direction. (k) The stopper 24 is arranged so as to be movable forward and backward perpendicular to the moving shaft 22. (l) It is constructed so that the auxiliary claw 1 is moved back from the normal position of the lower knife 5 to perform winding stitches, and the auxiliary claw 1 is brought close to the winding sewing claw 2 to perform overlock stitching without rolling the edge of the fabric. ing.