JPS6032469B2 - Fabric anti-corrosion device for sewing machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic sewing machine that automatically sews together multiple pieces of fabric, and relates to a device for preventing misalignment in the feeding direction (sharing) that occurs between fabrics during sewing work, and particularly for a device for clamping fabrics. This invention relates to improvements to the clamper.

Generally, in order to prevent this kind of sagging, a load is applied to the fabric in the opposite direction to the feeding direction, and the specific form is a clamper attached to the green of the fabric and a load means connected to this clamper. Consists of.

Conventionally, as such a clamper, for example, the Tokubatsu 51-
As shown in No. 111147, a gripping device grips the fabric, a control device mechanically locks the gripping device to hold the cotton, and when the fabric is released, it is fixed to the control device and the table. The mechanical lock between the control device and the cotton gripping device is released by the mechanical action of the activated actuating device.

However, such a conventional clamper requires an arbitrary mechanical locking means between the control device and the clamping device, which results in a complicated structure. Further, there is a drawback that the action of an external force caused by contact between the fabric release actuating device and the control device has an adverse effect on sewing, such as pitch reduction or seam allowance variation. SUMMARY OF THE INVENTION An object of the present invention is to provide a fabric sagging prevention device for a sewing machine that can completely eliminate the above-mentioned conventional drawbacks.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention will be described in detail with reference to the drawings, in which FIG. The clamper mechanism 2 includes a clamper mechanism 2 for clamping, for example, two overlapping fabric mechanisms 1 to be sewn together, and a load means connected to the clamper for applying a load to the fabric in a direction opposite to the feeding direction 13 thereof.

The fabric is sewn while being moved in the feed direction 13 by an advance/sew mechanism (not shown) of the sewing machine, as is well known. In this embodiment, the anti-corrosion device is applied to the fabric 1 as shown in Fig.
They are installed at appropriate locations on the side edges of the middle part of the army and on the rear edges. However, the present invention is not limited to this, and a plurality of anti-corrosion devices may be appropriately installed only on the side edge of the middle part of the fabric, only on the back edge of the fabric, or on the side edge of the middle part with increased intervals. . The work surface of the table is a magnetic work surface that can be attracted by a magnet, with a non-magnetic portion (not shown) in the vicinity of a sewing machine needle (not shown).

As clearly shown in FIG. 2, the clamper has a base 2Q that can be moved over the work surface 18 and clamping means for holding and releasing the portion of fabric placed on this base between the base and the base. It consists of 21.

In the illustrated embodiment, this clamping means is once attached to the base.
It consists of a clamp lever 23 whose rear end is secured by a pin 221, and a needle part 2 base attached to the free end, ie, the front end, of this clamp lever. The needle member consists of a horizontal part 24a and a vertical part 24b, and the tip of the vertical part is formed into a needle part 2c that sticks into the fabric, and this needle part slides into a hole 20a provided in the base 2Q'. It can be inserted freely. The horizontal portion 24a is fitted into a groove provided on the lower surface of the clamp lever and fixed by bolts 25 and nuts 26. That is, even if the horizontal part is inserted into the hole provided in the head 25a of the bolt 25, the bolt 25 is not connected to the clamp lever.
The clamp lever is fixed to the clamp lever by being screwed into a nut 26 that penetrates through the clamp lever in the thickness direction and is arranged on the upper surface of the clamp lever. The reference numeral 27 indicates a fabric presser, which is made of a plate-like member having spring properties, and one end of which is connected to the clamp lever 2.
It is screwed to the bottom of 3.

The end portion of the fabric presser foot is formed flat so as to come into pressure contact with the base, and has a hole in the flat portion through which the needle portion 24c passes. This fabric presser presses the fabric when the needle portion touches the fabric, thereby making it easier and more reliable for the needle portion to penetrate into the fabric.
A magnetic member 30 is provided in the intermediate portion of the clamp lever, and in the illustrated embodiment this magnetic member is in the form of a transfer wheel as shown in FIG.

This magnet member is supported by a shaft 32 on a U-shaped member 31, and this U-shaped member is fixed by a screw 331 to a bush 32 rotatably inserted into the clamp lever 23. For this reason, the U-shaped part can be turned freely, and the magnetic member acts like a normal caster. What is important is that this magnet part is attracted to the magnetic part of the work surface with an appropriate adsorption force, that is, an adsorption force that allows the base to slide on the work surface as described later, and the magnetic part of the work surface is attracted to the magnetic part of the work surface. As shown in Figure 2, the clamp means is held in the fabric holding position when the needle portion 24c is attached to the fabric. Therefore, as will be described later, when the base cloth moves on the work surface together with the fabric, the magnet part in the form of a transfer wheel is attracted to and transferred to the magnetic part of the work surface. A spring 35 is stretched between the rear end of the clamp lever 23 and the base 2Q, and this spring always moves the clamp lever upward, that is, as shown by the iron wire in FIG. biasing the fabric to the release position away from the

It should be noted that the force of this spring 35 is set smaller than the attraction force between the magnet member 38 and the magnetic part of the work surface. Therefore, "the clamping means is held in the fabric holding position on the magnetic part of the work surface by attraction to the magnetic part of the magnet member 30, but on the non-magnetic part of the work surface, the clamp means is not attracted to the non-magnetic part of the magnet member 38. It is held in the cloth release position by a spring 35. It goes without saying that the magnet member is set to reach the non-magnetic portion before the clamper hits the sewing machine needle.

The load means 14 comprises an electric motor 40 in the illustrated embodiment.

A pulley 41 is fixed to the drive shaft of this motor, and a movable wire 42 is wound around this pulley.The free end of this wire is fixed to the rear end of the base 20 as shown in FIG. This motor is mounted by appropriate means in a case 43 fixed on the work surface of the table.A control circuit (not shown) is connected to the outside of the electric motor. selectively adjusts the value of the current flowing through the motor.For details of the load means consisting of the electric motor and the control circuit, see Japanese Patent Application No. 52-101234, filed by the present applicant. 43
As shown in FIG. 1, the clamper is provided with a positioning member 45 for positioning the fabric at the fabric setting position, and this positioning member is provided with a boat 46 capable of accommodating the base 20.

The fabric is set on the clamper at this fabric setting position. The fabric setting position of the clamper is detected by fabric setting position detection means such as a limit switch. When the fabric is placed on the base at the fabric setting position shown in FIG.
Activation means 55 are also provided for activating the clamping means into the fabric holding position in response to the detection means.

This activation means consists of a solenoid 56 and a lever 57 that is activated by the solenoid. One end of this lever is disposed above and opposite to the clamp lever 23. When the edge of the fabric to be clamped is set on the base, the solenoid 56 is switched on by a signal from the detection means 50, the lever 57 is activated, the clamp lever 23 is pushed down, and the needle portion 24c is pricked into the fabric at the same time. The magnet member 30 is attracted to the magnetic part of the work surface. A holding means 60 is provided to temporarily hold the fabric when clamping the fabric to the clamper. Case 6 fixed on the board
3, a solenoid 64 fixed within the case, a holding lever 65 that can be activated by this solenoid, and the case 6.
3 and a suitable detection means 66 attached to it.

When the fabric is set on the base as described above, the holding lever 65 is actuated by a signal from the detection means 66 that detects the fabric to hold the fabric on the substrate. To explain how the above device is used, first, at the fabric setting position, the fabric is held between the base and the clamping means, and the sewing machine's advance/sew mechanism starts operating to sew the fabric, and the fabric is fed and sewn. At the same time as the fabric is being moved forward, the motor is activated and a moderate load is applied to the fabric as it moves forward.

As the fabric moves, the clamper moves while clamping the fabric by the attraction of the magnetic member to the magnetic part of the work surface. When the fabric moves forward under a suitable load and the clamper reaches a non-magnetic part of the working surface located near the sewing machine needle, and the magnet contacts the non-magnetic part, the clamp lever is immediately moved by the spring 35. The clamper is rotated to the cloth release position, and thus the clamper is released from the cloth and quickly pulled back to the cloth setting position by the motor 401. The motor then stops. In this way, appropriate tension is applied to the fabric while it is being sewn to prevent it from sagging. According to the present invention, since the fabric is held in the fabric holding position by adsorption between the magnetic member provided on the clamper and the magnetic part of the work surface, there is no need for any mechanical locking means as in the past. Therefore, the structure is extremely simple and the operation is reliable.

In addition, in the present invention, when releasing the fabric, it is done simply by non-adsorption between the magnet part and the non-magnetic part, without applying any external mechanical force as in the case of a follower, so that the solution can be carried out smoothly, and there is no adverse effect on sewing. Highly reliable.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional plan view of the anti-corrosion device according to the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a sectional view taken along line B--
It is a sectional view taken along the B line. 10...Work surface, 11...Fabric, 12...
...Kurasopa, 14...Loading means 23.
... Clamp lever, 24 ... Needle member,
30... Magnet member, 35... Spring. Figure 2 Figure 3

Claims (1)

[Claims] 1. A table on which the work surface on which the fabric to be sewn is placed consists of a magnetic part and a non-magnetic part, and the non-magnetic part is provided near a sewing machine needle, and a base that is slidable on the table. a clamping means provided on the base so as to be movable between a fabric holding position for holding the fabric and a fabric release position for releasing the fabric between the base; a magnetic member capable of adhering to the magnetic portion of the table to such an extent as to permit sliding of the base to maintain the fabric in the fabric holding position; and spring means for positioning the fabric in a fabric release position. 2. The device according to claim 1, wherein said clamping means comprises a clamp lever having one end pivotally connected to a base, and a needle member provided at a free end of said clamp lever for penetrating the fabric on said base. 3. The apparatus of claim 1, wherein said magnetic member comprises a rolling wheel that rolls over the work surface of the table as said base slides. 4. The apparatus of claim 2, wherein said clamping means includes a fabric presser for holding the fabric on the base when the needle member engages the fabric. 5. The device according to claim 3, wherein the rolling wheel is pivotable.