JPH0344552B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention applies tension to a two-ply workpiece that is fed along a sewing machine table surface in connection with the sewing machine drive, so that it can be sewn by an automatic two-ply sewing machine. The present invention relates to a fabric edge clamping device that facilitates sewing, and more particularly to a fabric edge clamping device that can recover a clamp body that is fixed to a workpiece and fed along with the workpiece to a sewing start position.

[Conventional technology]

As a conventional cloth edge clamping device, for example, the technique described in Japanese Patent Application Laid-Open No. 111147/1982 will be described with reference to FIG. The sewing machine 1 is fixed to the front of the sewing machine table 2 in the cloth feeding direction, and the sewing machine 1 is fixed to the sewing machine table 2 in front of the sewing machine table 2 in the cloth feeding direction, and the sewing machine 1 guides the sewing start tips of two pieces of workpieces W stacked vertically on the stitch forming part 3 such as a needle and feed dog to the guide part 4. are placed in contact with each other.

Reference numeral 5 denotes a clamp body that can support and release the rear end portion _W1 of the workpiece, and this clamp body 5 rotates around the rear end, and is connected to an upper jaw portion 7 with a needle 6 fixed downwardly at its tip. is attached to the lower sliding part 8 that slides on the sewing machine table so as to be rotatable up and down,
When the rear end W1 of the workpiece W is inserted into the needle ₆ and the jaw part 7 and the sliding part 8 are aligned, the workpiece W is supported by being latched by a latch mechanism (not shown). In addition, the release arm 9 erected from the jaw section 7
By rotating the needle rearward, the latch is released and the tip of the needle 7 is raised, and the rear end _W1 is released from the needle 7.

A cable 10 is connected to the rear end of the clamp body 5, and a weight 11 pulls the clamp body 5 in the reverse cloth feeding direction. Reference numeral 12 denotes a release means having a lever 13 provided at the front side of the sewing machine in the cloth feeding direction;
Reference numeral 4 denotes a recovery means for receiving the clamp body 5 pulled in the reverse cloth feeding direction by the weight 11.

Now, it is assumed that the leading end of the workpiece W is supplied to the stitch forming section 3 of the sewing machine 1 on the sewing machine table surface, and the clamp body ₅ is supported by the rear end W1. When the sewing machine 1 is driven, the workpiece W moves in the cloth feeding direction A,
Following this, the clamp body 5 slides on the sewing machine table surface while pulling up the weight 11. As a result, tension can be applied to the object W to be sewn, and overlapping stitching can be stabilized. When a stitch is formed on the rear end _W1 , the release arm 9 contacts the lever 13, rotates the lever 13 backward to release the latch, and the clamp body 5 releases the workpiece W. do. Then, the clamp body 5 holds the cable 10 by the weight 11.
It is pulled back in the reverse cloth feeding direction and received by the collecting means 14. The next item W to be sewn is collected by this collecting means 1.
The rear end part _W1 is supported by the clamp body 5 at 4, and the leading end part is attached to the sewing machine 1.

[Problem that the invention seeks to solve]

However, the cable 10 is connected to the rear of the clamp body 5, and when the clamp body is recovered, the new workpiece W passes through the path on which the next workpiece W is to be sewn. could not be placed on the sewing machine cable 2 until it returned to the collection means 14.

Furthermore, since only one clamp body 5 is used, the clamp body 5 cannot be supported on a new workpiece W to be sewn next until it returns to the collecting means 14, and during that time, the worker cannot The staff were only waiting, reducing work efficiency.

The present invention solves the above-mentioned defects, and sets the collection path of the clamp body separately from the moving path of the sewing material, and also uses at least two clamp bodies, thereby making it possible to sew a new item to be sewn next. Sewn item W
On the other hand, the object is to support the clamp body while the previously sewn workpiece is being fed.

[Means for solving problems]

For this reason, the present invention provides a conventional clamp device that includes a support section that supports the clamp body, and a moving means that moves the support section from the release position to the support position along a collection path that deviates from the cloth movement path. The present invention proposes a cloth edge clamp device characterized in that the conventional cloth edge clamp device is further provided with a first support portion that supports the clamp body released in the release position, and the first support portion is A first moving means for moving the cloth to a removal position that is out of the cloth movement path associated with cloth feeding of the sewing machine, and a clamp body that has been moved to this removal position can be returned to the supporting position through the outside of the cloth movement path. The present invention proposes a cloth edge clamping device characterized by comprising a second moving means.

〔Example〕

An embodiment of the present invention will be described based on FIG.

A sewing machine 1 is fixed to the sewing machine table 2 at the front in the cloth feeding direction, and the sewing machine 1 is provided with a stitch forming section 3 using needle feeding teeth or the like. Further, the sewing machine table 2 is provided with a well-known cloth guide section 4 in front of the sewing machine 1 in the feeding direction. Also, sewing machine table 2
The upper surface is made of a magnetic material such as iron, and the vicinity of the cloth guide portion 4 is made of a non-magnetic material such as plastic.

A and B are the rear ends of the two-layered workpiece W
It is a clamp body that supports W ₁ and can release this support, and these clamp bodies A and B have a sliding part that slides on the sewing machine table surface 2 and a needle at the tip, and the tip part can be rotated up and down. (not shown)
Therefore, the jaw section is always held in the upper position by the spring. Furthermore, a magnet (not shown) is provided on the lower surface of the jaw section so that it can come into contact with the sewing machine table surface 2. When the jaw section is lowered and the magnet is attached to the sewing machine table surface 1 made of iron plate, the magnet moves the jaw section to the lower position. Furthermore, it has the role of a sliding resistor that restricts the movement of the clamp bodies A and B with respect to the table surface by this magnetic force.

20 is a first air cylinder, and the cloth guide section 4
Clamps A and B, which are located at the non-magnetic position (released position) of the sewing machine table 2, which is placed in front of the cloth feed direction of the sewing machine 1, are moved to the first clamp body that is out of the movement path of the workpiece W as the sewing machine 1 feeds the cloth. The rod is moved to the removal position, and there is an electromagnet (first support part) at the tip of the rod.
20a is attached to enable support and release from the clamp body. The first air cylinder constitutes a first moving means.

Reference numeral 21 denotes a second air cylinder, which moves the clamp bodies A and B horizontally away from the movement path of the workpiece W as the sewing machine 1 feeds the cloth, and is disposed closer to the support position than the first removal position. It is possible to move from this position to a position on the sewing machine table where the rear end of the workpiece W before sewing is placed or a position close to this (support position). If this support position is located before the rear end of the table in the cloth feeding direction, when the workpiece is supported by the clamp body and fed to the sewing machine, the workpiece As a result, the clamp body is dragged, which has the effect of tensioning the material to be sewn.

The clamp body A,
This is a conveyor that is stretched around pulleys 23 and 24 so that B moves, and is driven by a motor 25. This second air cylinder 21 and the conveyor 2
2 or, if this conveyor is configured to move the clamping body to the supporting position, the second moving means is constituted by this conveyor. 2
Sensors 6 and 27 detect the release position and second removal position of the clamp bodies A and B, and are composed of limit switches or optical sensors.

Reference numerals 28 and 29 are stoppers for stopping the movement of the clamp bodies A and B at the first removal position and the second removal position.

Next, the effect will be explained.

This device uses two clamp bodies A and B, and when one clamp body A is in the supporting position, the other clamp body B supports the workpiece W and moves on the sewing machine table surface 2. or from the release position to either the first removal position or the second removal position, the figures showing the first removal position.

First, place the clamp body A in the support position, lower the jyo part so that the needle of the clamp body A is inserted into the rear end _W1 of the overlapped workpieces W, and place the magnet of the jyo part on the sewing machine table. 2 is supported by magnetic force. The tip of the workpiece W is attached to the stitch forming section 3 of the sewing machine 1, the workpiece W is set so as to be aligned with the cloth guide section 4, and the sewing machine 1 is started (S ₁ ).

The workpiece W is sequentially fed in the feeding direction, and at the same time, the clamp body A supports the jaw section downward with a magnet and applies tension to the workpiece W in order to slide on the table surface. give and stabilize sewing,
It is possible to perform matching stitches accurately.

When the clamp body A moves to the release position and this is detected by the sensor 26 (S ₂ ), the clamp body A enters the non-magnetic part of the table surface, the jaw part rises, and the rear end part W ₁ becomes free and is sent out by a stacker after sewing is completed.

Next, the clamp body A moves from the release position to the first removal position by the extension and retraction of the air cylinder 20 with the electromagnet 20a turned on. Then, the stopper 28 separates the air cylinder 20a and turns off the electromagnet 20a (S ₄ ).

Next, turn on the belt motor 25 and turn on the conveyor 2.
2 to move the clamp body A from the first removal position to the second removal position (S ₅ ). The sensor 27
When turned ON (S ₆ ), the belt motor 25 is turned OFF (S ₇ ).

Next, it is determined by starting the sewing machine whether or not the other clamp body B is moving while supporting the new workpiece W (S ₈ ). Accordingly, a timer waits for the time required to move to a predetermined position, a release position, or a first removal position during the movement (S ₉ ). Note that this timer may be replaced with a sensor that detects when the clamp body has been moved to a predetermined position.

Clamp body A waits for a predetermined time by a timer
is returned from the second removal position to the support position by the operation of the second air cylinder 21.

The worker holds the new workpiece to be sewn next with both hands while overlapping it, and attaches the rear end to this clamp body A.
Since W ₁ can be set, alignment can be done accurately and quickly without any deviation.

Note that the movement of the clamp body from the first removal position to the support position (second movement means) is not limited to the conveyor and air cylinder shown in the above embodiments.
A sliding surface is formed between the first removal position and the support position, with the first removal position being higher, and a lifting means for lifting the clamp body from the release position to the first removal position is provided. It is also possible to slide the clamp body, and it is also possible to suspend the clamp body by disposing means for suspending it between the positions.

Furthermore, in the above embodiment, by stopping at the second removal position, using this as the support position, and dragging the clamp body until sewing starts, the structure can be omitted and the cost of the apparatus can be reduced.

Furthermore, the first moving means and the second moving means are integrally formed, and a conveyor is disposed between a release position and a support position, for example, as a moving means for moving the cloth along a collection path that deviates from the cloth movement path, An electromagnet serving as a support part capable of supporting and releasing the clamp body in the released position may be arranged on the conveyor.

〔Effect of the invention〕

The present invention has the above-described structure and operation, and the clamp body can be removed from the movement path of the workpiece and recovered to the supporting position, so that the next workpiece can be placed on the sewing machine table quickly. It is possible, and
Since two clamp bodies are used, while one clamp body is supporting and releasing the workpiece, the other clamp body can be supported by the workpiece.
This reduces worker waiting time and improves productivity.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
The figure is a perspective view showing a conventional example, and FIG. 3 is an operation flowchart of the embodiment shown in FIG. {20...first air cylinder, 20a...electromagnet} first moving means, {22...conveyor, 21...
...Second air cylinder} Second moving means.

Claims (1)

[Scope of Claims] 1. A cloth to be sewn is moved along a cloth movement path on a cloth support stand while applying tension to the cloth being conveyed by a sewing machine, with the cloth being attached to the rear end, and immediately before the end of sewing, A clamp body that is released from the fabric, supports the rear end of the fabric at a support position on the sewing machine table where the rear end is placed before sewing, and is connected to the movement of the fabric during sewing. In a fabric edge clamping device, the clamp moves on the sewing machine table while applying tension to the fabric, and is released from the fabric by a release means provided at a release position in front of the fabric feed direction of the sewing machine just before the end of sewing. 1. A cloth edge clamping device, comprising: a support portion for supporting the body, and a moving means for moving the support portion from the release position to the support position along a recovery path that deviates from the cloth movement path. 2. Move along the cloth movement path on the cloth support stand while attaching to the rear end of the cloth to be sewn and applying tension to the cloth being conveyed by the sewing machine, and make sure that the cloth does not attach to the cloth just before the end of sewing. A clamping body that is released and supports the rear end of the fabric in a support position on the sewing machine table on which the rear end is placed before sewing, and that applies tension to the fabric in connection with the movement of the fabric during sewing. In the fabric edge clamping device, the clamp moves on the sewing machine table while giving the sewing machine table, and is released from the fabric by a release means provided at the release position at the front in the fabric feed direction of the sewing machine just before the end of sewing.The clamp is released at the release position. a first moving means for moving the first supporting part to a removing position that is out of the cloth moving path accompanying the cloth feeding of the sewing machine; and a second moving means capable of returning to the supporting position through the outside of the moving path of the cloth.