JPS633667Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a cloth guide device for an automatic serging sewing machine used to prevent fraying of cut edges.

Automatic serging sewing machines usually have a plate-shaped fabric guide with a thickness that corresponds to the thickness of the fabric.
In addition, a fabric guide device equipped with a spacer that functions as a ruler for the edge of the fabric is installed on the table in front of the needle drop position, and a sensor detects the edge of the fed fabric, and then sewing begins, and the end of the stitch is The edge of the fabric is guided to the needle drop position while the hem stitch is automatically sewn all at once until reaching the hem. However, with conventional fabric guide devices, the thickness of the spacer, that is, the distance between the guide and the table, is The gap between the gaps is set to the thickness of the fabric to be sewn, so even though it may not be a problem for a single flat piece of fabric, when sewing a piece of fabric with a layer, a sewing jam will occur at the layer and the seams in that area will be sewn to other parts. When sewing reinforcing fabric, such as when sewing a piece of cloth (kurotsuchi) to reinforce the crotch part of the front part of pants, the reinforcing fabric may become thinner than the other parts. There were some problems, such as the sewing machine getting caught in the middle and not being able to be applied to the automatic serging machine.

The purpose of this invention is to solve this problem, and for this reason, the guide is made separate from the spacer and rotatably attached to the shaft, so that it can be rotated upward when passing through the stepped section or the reinforcing fabric section. This is to prevent the above-mentioned problems from occurring.

To explain this using drawings, Fig. 1 shows an overall view of an automatic surging sewing machine in which a cloth guide device 1 according to the present invention is installed in front of a presser foot 2, and the sewing machine is different from known sewing machines of this type. Similarly, a foot movement changeover switch (not shown) is provided to switch the operation of the sewing machine between the automatic surging side and the foot movement side, and on the automatic surging side, a photoelectric sensor 5 (see Fig. 4) installed on the table 3 under the cloth guide device. The sewing operation is performed by detecting the edge of the fabric using the foot pedal, and the photoelectric sensor 5 is deactivated on the foot side, and in this state, the sewing speed of the sewing machine is changed from low to high speed by operating the foot pedal 6. It's starting to get adjusted.

As shown in detail in FIGS. 2 to 4, the cloth guide device is fixed to the table 3 together with a bracket 8 by screws 9, 9, and serves as a guide ruler for guiding the edge of the cloth with its curved side edge surface. A functional spacer 10 (see Fig. 4) is attached to the bracket 8 by hinges 11, 11, and the spacer 1
A cloth guide 12 is placed on the table 3 and forms a gap corresponding to the thickness of the spacer, that is, the thickness of the cloth, and the cloth guide is connected to the hinge 11.
The drive mechanism also includes a pair of drive cylinders 15, which are attached to the bracket 8 vertically in parallel.
15, a stopper 16 fixed to the drive shaft end of the upper drive cylinder 15 in a position-adjustable manner; one end is pivoted to the protrusion 17 attached to the cloth guide 12, and the other end is attached to the stopper 16. A screw rod 19 is loosely fitted into a drilled elongated hole (not shown) and protrudes, and has an adjustment nut 18 screwed onto the protruding end that can adjust the amount of rotation of the cloth guide 12; It is interposed between the adjustment nut 21 and the collar 22 loosely fitted to the screw rod 19,
A coil spring 23 whose strength can be adjusted by rotating an adjustment nut 21 and a stopper 1 attached to the drive shaft end of the lower drive cylinder 15.
and a stopper 25 that restricts the retraction of 6.

The cloth guide 12 is thus not only rotated by the drive cylinder 15 but also able to be lifted up against spring pressure.

As mentioned above, the cloth guide 12 is rotated by the drive cylinder 15, but each drive cylinder is controlled by a speed controller in order to make the operation smooth and avoid applying impact to the cloth guide. The timing of its operation is controlled by solenoid valves and signals from each switch and controller. In a preferred embodiment, the presser foot 2 is attached to the fabric guide 1.
A presser foot changeover switch is provided which can be controlled in conjunction with the presser foot 2, and can be adjusted to the following three stages by this switch.

The first is as shown in FIG. 5, in which the drive shaft of the lower drive cylinder 15 is extended, and the drive shaft of the upper drive cylinder is moved back from the fully extended state until the stopper 25 engages with the stopper 16. However, the cloth guide 12 has been slightly lifted to make it easier to insert the cloth, and the presser foot 2 has been raised to a position where the cloth can be inserted and pulled out (see FIG. 3).

The second case is as shown in Fig. 6, in which the drive shaft of the upper drive cylinder is fully extended, the fabric guide 12 is in the lowest position, that is, the closed position, and the presser foot is also lowered (see Fig. 2). ).

The third type is as shown in FIG. 7, in which the drive shafts of the upper and lower drive cylinders are moved backward, and the cloth guide 12 is opened until the stopper 16 engages with the stopper 25, and the reinforcing cloth such as a crotch is inserted. The presser foot 2 is lowered so that the cloth can be placed at a desired position and guided manually along the side edge surface of the spacer (see FIG. 4).

Next, the process of sewing reinforcing fabric using an automatic serging sewing machine equipped with a fabric guide device controlled by the presser foot changeover switch will be explained using the example of attaching a crotch to the front body of pants as shown in Figure 8. I will explain.

The serging process when attaching a crotch to the front of pants consists of the following three steps.

In the first step shown in Fig. 8, the foot movement changeover switch is set to the foot movement side, the presser foot changeover switch is set to the first state (Fig. 5), and the presser foot 2 and cloth guide 1 are
Insert the cloth under the cloth, then turn the selector switch to the second position (Fig. 6). In this state, by depressing the foot pedal 6, edge stitching is performed on the edge of the fabric up to this side of the crotch attachment part. After finishing the edge stitching up to the front of the crotch attachment, stop the sewing machine using the foot pedal.

In the next step shown in FIG. 8, the presser foot changeover switch is changed from the second state to the third state in FIG. In this state, place the crotch at the desired position on the cloth, depress the foot pedal, feed it under the presser foot while supporting it with your hand, and sew the crotch and cloth together. After sewing one side of the crotch, the sewing machine is stopped and the fabric is removed from under the presser foot.

In the final step shown in FIG. 8, the foot movement changeover switch is switched from the foot movement side to the automatic surging side, and the presser foot changeover switch is placed in the first state. When the cloth is inserted under the cloth guide in this state, the photoelectric sensor 5 detects the edge of the cloth, and based on the detection signal, the presser foot 2 and cloth guide 12 are lowered to enter the automatic surging state, which removes the remaining part of the crotch part. Edge stitching is performed to the edge of the fabric.

Crotch attachment is performed by the automatic surging sewing machine as described above.

As described above, in the cloth guide device of the present invention, the cloth guide is formed separately from the spacer so that it can rotate in the vertical direction, and furthermore, a pair of drive cylinders 15 are arranged on the table, and one of the cloth guides is arranged on the table. The fabric guide 12 is rotated by the operation of the piston rod of the other drive cylinder, and the amount of rotation of the fabric guide 12 is regulated by the operating position of the piston rod of the other drive cylinder. The fabric guide allows you to raise the fabric guide, place the reinforcing fabric at the desired position on the fabric, and guide it while placing your hand on it, making it possible to sew reinforcing fabric that was previously impossible to sew on automatic serging machines. There is an operating position where the reinforcing fabric is to be sewn (Fig. 6), and a position where it is slightly raised to facilitate fabric insertion (Fig. 5).
Although it can be switched to the raised position (Fig. 7) so that it can be guided while supporting the hand, it can be easily and reliably performed even during suturing by simply using a pair of drive cylinders. If we were to change the stroke using the drive cylinder of the piston rod so as to be able to switch between the three positions as described above even during suturing, a complicated control mechanism would be required, but the piston rod could be switched between two positions: the forward position and the backward position. It has the advantage that it can be easily performed by just using a pair of drive cylinders.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an automatic surging sewing machine equipped with a fabric guide device according to the present invention, and Figs. 2 to 4 are enlarged perspective views of the fabric guide device, with the fabric guide in a slightly lifted state, a closed state, and a closed state, respectively. Figures 5 to 7 are schematic diagrams showing the relationship between the presser foot and the cloth guide corresponding to Figures 2 to 4. Figure 8 shows the process of attaching the crotch to the front body of the pants. It is a diagram. 1... Cloth guide device, 2... Presser foot, 3... Table, 5... Photoelectric sensor, 6... Foot pedal, 8... Bracket, 10... Spacer, 1
2... Cloth guide, 13... Drive mechanism, 15... Drive cylinder, 16... Pad, 19... Screw rod,
23...Coil spring, 25...Stopper.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Having a thickness equivalent to the thickness of the cloth under the cloth guide on the table in front of the needle drop position of an automatic serging sewing machine used to prevent fraying of the edges of cloth;
The fabric guide device is provided with a fabric guide device equipped with a spacer that functions as a ruler for the fabric, and guides the edge of the fabric while edge stitching is performed by an automatic serging sewing machine from one edge of the edge of the fabric to the other. , the cloth guide 12 is separate from the spacer 10 and pivoted so that it can be opened and closed in the vertical direction, and a pair of drive cylinders 15 are arranged on the table, and the movement of the piston rod of one of the drive cylinders A cloth guide device in which the cloth guide 12 is rotated and the amount of rotation of the cloth guide 12 is regulated by the operating position of the piston rod of the other drive cylinder. (2) The fabric guide device according to claim 1, which is provided with a switch that can control the fabric guide 12 in conjunction with the presser foot 2. (3) The fabric guide device according to claim 1, wherein the fabric guide is provided with a spring 23 that biases the guide downward, and the fabric guide is lifted up against the spring.