JPH02289294A - Cloth conveying device for automatic thread cutting machine - Google Patents

Abstract

PURPOSE:To automatically perform a thread cutting process in a way to cause the feed of cloth to match a sawing speed by a method wherein a solenoid valve to cause a cloth cylinder to effect a slow and a rapid feed is mounted to the cloth feed cylinder, and an empty ring formed in cloth is automatically fed to the suction position of a thread cutting device. CONSTITUTION:With a feed solenoid valve 16 turned ON, the working shaft of a cloth feed cylinder 6 is expended and completion of the passage of cloth 13 is detected by means of cloth detecting sensor 4. When a time of the timer of the solenoid valve 16 elapses, the feed solenoid valve 16 is turned OFF. In which case, a cloth press solenoid valve 10 of a cloth press cylinder 8 is turned ON, a cloth press 9 is lowered to press the cloth 13. With a low speed return solenoid valve 17 turned ON, the cloth press 9 is moved at a low speed approximately matching the sawing speed of a sewing machine in a state to press the cloth 13 against a table 1 when a cylinder sensor 15 mounted to the cloth feed cylinder 6 is turned ON, the low speed return solenoid valve 17 is turned OFF. Since the turning ON position of the cylinder sensor 15 is a position where an empty ring 14 at the end part of the cloth 13 is sucked in the suction port of a thread cutting device 5, a part of the empty ring 14 is sucked in the suction port to effect cutting of thread.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fabric conveying device for an automatic thread-cutting sewing machine that automatically carries out fabric feeding and thread cutting.

[Prior Art] Conventionally, as shown in FIG. 9, this type of device has a sewing machine head 2 with a presser foot 3 mounted on a table 1, and a sewing machine head 2 is provided with a presser foot 3 on the table 1. A cloth detection sensor 4 for detecting the front and back of the cloth 13 and a cloth edge detection sensor 25 for detecting the rear end of the cloth 13 are provided. It has been proposed that a knife 24 is provided to cut the empty ring 14 at the rear end of the cloth 13, and a cloth feed cylinder 6 is further provided as a cloth conveyance device for feeding the sewn cloth. A 5-port solenoid valve 7 is connected to the cloth feed cylinder 6.
Further, a presser cylinder 8 is fixed to the operating shaft, a presser foot 9 is provided on the cylinder 8, and a 3-port solenoid valve 10 is connected to the cylinder 8. A bar stacker 11 and a stacking stand 12 are provided at the end of the table 1 to stack the cloth sent thereon.

In the conventional cloth conveying device configured as described above, the cloth presser foot 9 of the cloth presser cylinder 8 is moved to the cloth feeding position by pushing out the operating shaft of the cloth feed cylinder 6, as shown in FIG. , The process of pressing the cloth 13 sent ■
, the cloth feeding step (■) in which the pressed cloth 13 is fed by pulling the operating shaft of the cloth feed cylinder 6, and the step (2) in which the cloth 13 is released by lifting the cloth presser foot 9 of the cloth presser cylinder 8. I'm taking it.

[Problems to be Solved by the Invention] In the conventional technology, in order to make the uncut portion of the empty ring 14 as short as possible, the time from when the cloth edge detection sensor 25 detects the rear end of the cloth 13 until the knife 24 is activated is determined. Since the timer is set, if the cloth 13 is not moved quickly,
The rear end of the cloth 13 was sometimes cut.

In order to prevent cutting accidents of the fabric 13, a thread cutting device 5 of the type that sucks in and cuts the loop 14 is provided below the table 1, and a frost detection sensor 4 is also provided on the fabric entry side of the sewing machine head 2. Similar sewing machines are also known.

However, in this cloth feeding device, the speed at which the cloth 13 is moved while pressing the cloth 13 with the presser foot 9 of the cloth feed cylinder 6 is much faster than the sewing speed of the sewing machine head 2 during the cloth feeding step (2). Since the presser foot 3 of the sewing machine head 2 is in a state of pressing the empty ring 14 of the thread remaining at the end of the cloth 13, as shown in FIG. The problem is that the hollow ring 14 of the cloth 13 is stretched between the presser feet 3 of the table 1, and the suction port of the thread cutting device [5 installed on the table 1] cannot suck the hollow ring 14, making thread cutting impossible. was there.

Therefore, a type of thread cutting device that sucks in the empty ring 14 and cuts it! In the case of No. 15, in order to ensure that the empty ring 14 is sucked into the thread cutting device 5, the cloth 13 is moved by hand after sewing by the sewing machine is completed.

The trailing end of the fabric 13 temporarily stops at a position where it has slightly passed through the thread cutting device 5. This allows time for the thread cutting device 5 to suction and cut the empty ring 14. After that, the fabric presser The cloth 13 was sent to the stacker device by a cloth feeding device consisting of a cloth feeding cylinder 9 and a cloth feeding cylinder 6. Therefore, there were drawbacks such as poor work efficiency and high costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fabric conveying device for an automatic thread-cutting sewing machine that automatically performs a thread-cutting process by matching fabric feeding and sewing speeds.

[Means to be Solved by the Invention] In order to solve the above-mentioned problems, the present invention feeds a sewn cloth using a cloth presser foot and a cloth feed of a cloth feed cylinder, and removes an empty ring formed at the end of the cloth. In a cloth conveyance device of an automatic thread trimming sewing machine, the cloth is fed to a stacker device by the cloth feed cylinder after being suctioned and cut by a suction thread cutter provided on a table, and the cloth feed cylinder is used for slow feed and fast feed. A solenoid valve is provided to automatically send the empty ring formed in the cloth to the suction position of the thread cutting device.

[Function] According to the present invention, by providing a solenoid valve that causes the cloth feed cylinder to perform fast feed and slow feed, the slow feed feeds the cloth in accordance with the sewing speed by the sewing machine head, and the presser foot by the cloth presser cylinder is This prevents the tension of the empty loop between the machine head and the presser foot of the sewing machine head, and ensures that the empty loop at the end of the fabric is sent to the suction port of the thread cutting device to automatically cut the thread, and then the fabric is sent to the stacker device. be able to.

[Embodiment] Referring to FIG. 1, in the cloth conveying device of an automatic thread trimming sewing machine according to an embodiment of the present invention, 1 is a table, 2 is a sewing machine head, 3 is a presser foot, 4 is a frost detection sensor, and 5 is a thread. A cutting device, 6 a cloth feed cylinder, 8 a presser cylinder, 9 a cloth presser, 10 a 3-boat presser solenoid valve, 11 a bar stacker, and 12 a loading platform, these structures are the same as the conventional example above. Since they are almost the same, the explanation will be omitted, but in this embodiment.

A magnetic cylinder sensor 15 is attached to the cloth feed cylinder 6.
Further, a feed solenoid valve 16 whose operating shaft extends, a low speed return solenoid valve 17 and a high speed return solenoid valve 18 are connected to the cloth feed cylinder 6.

Further, referring to FIG. 2, in the control device that controls the fabric conveying device of the automatic thread trimming and rimming machine shown in FIG.
OM20, RA, M21 are connected, and CPU19
A cylinder sensor 15, a cloth detection sensor 4, and a drive circuit 23 are connected to the input/output boat 22 via an input/output boat 22. A feed solenoid valve 16, a low-speed return solenoid valve 17, a high-speed return solenoid valve 18, and a presser foot solenoid valve 10 are connected to this drive circuit 23.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG. First, when the apparatus starts, as shown in FIG.
When the sewing machine motor (not shown) of the sewing machine head 2 is sent, the sewing machine motor (not shown) of the sewing machine head 2 is activated. Here, the feed solenoid valve 16 connected to the cloth feed cylinder 6 is turned on, and the operating shaft of the cloth feed cylinder 6 extends as shown in FIG. It will be determined whether the Here, when the cloth 13 passes through, it is further determined whether the timer of the feed solenoid valve 16 has elapsed, and if the time has elapsed, the feed solenoid valve 16 is turned off.

Here, the presser foot solenoid valve 10 of the presser foot cylinder 8 is turned on, and the presser foot 9 descends to press down the cloth 13. Next, when the low speed return solenoid valve 17 is turned on, as shown in FIG. The presser foot 9 of the presser cylinder 8 moves at a slow speed approximately matched to the sewing speed of the sewing machine while holding the cloth 13 on the table 1. Then, it is determined whether the cylinder sensor 15 provided in the cloth feed cylinder 6 is turned on, and if the cylinder sensor 15 is turned on, the low speed return solenoid valve 17 is turned off. The ON position of this cylinder sensor 15 is
As shown in FIG. 7, the hollow ring 14 at the end of the cloth 13 is at a position where it is sucked into the suction port of the thread cutting device 5, and a part of the hollow ring 14 is thereby sucked into the suction port to perform thread cutting. be exposed. Then, it is determined whether or not the thread trimming timer time has elapsed, and when the time has elapsed, the sewing machine motor is turned off. Then, the high-speed return solenoid valve 18 is turned on, and the presser foot cylinder 8 and presser foot 9 feed the cloth 13 at high speed, as shown in FIG. Here, the high-speed return solenoid valve 18
It is determined whether the timer has elapsed or not, and when one hour has elapsed, the high-speed return solenoid valve 18 is turned off.

At this time, a portion of the fed cloth 13 hangs down from the table 1, so the bar stacker 11 rotates, and the cloth 13 is stacked on the stacking table 12, thereby completing the series of operations. Then, when the next cloth 13 is sent, the cloth detection sensor 14 operates to repeat the above process again.

In the embodiment of the present invention, the low-speed return solenoid valve 17 is connected to the feed cylinder 6 in this way, and the cloth feed cinder 16 is operated in accordance with the sewing speed of the sewing machine head.

Since the fabric 13 is fed, the empty ring 14 of the fabric 13 can be reliably sucked in and cut by the suction port of the thread cutting device 5, and one person is not required, which improves work efficiency and reduces costs. becomes cheaper.

[Effects of the Invention] Since the present invention is configured as described above, the slow feed allows the cloth to be fed in accordance with the sewing speed of the sewing machine head, and the distance between the presser foot of the cloth presser cylinder and the presser foot of the sewing machine head is reduced. This prevents the tension of the empty ring, and the empty ring at the end of the fabric is reliably sent to the suction port of the thread cutting device, allowing the thread to be cut automatically, so there is no damage to the fabric as with conventional methods. It also has the advantage of not requiring any manpower, improving workability and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a cloth conveying device of an automatic thread trimming sewing machine according to an embodiment of the present invention, FIG. 2 is a block diagram of a control device that controls each part of the device shown in FIG. 1, and FIG. Flowchart for explaining the operation of the control device shown in FIG. 4 to FIG. 8 are diagrams for explaining the operation of the device shown in FIG. , FIG. 10, and FIG. 11 are diagrams for explaining the drawbacks of the conventional device. DESCRIPTION OF SYMBOLS 1... Table, 2... Sewing machine head, 3... Presser foot, 4... Cloth detection sensor, 5... Thread cutting device, 6...
・・Cloth feed cylinder, 8 ・・Paper presser cylinder, 9・・
- Presser foot, 10... 3-boat presser foot solenoid valve, 11.
... Bar stacker, 12... Loading platform, 15... Cylinder sensor, 16... Feed solenoid valve, 17... Low speed return solenoid valve, 18... High speed return solenoid valve, 19... CP
U, 20...ROM, 21...RAM, 22.・・・
- Input/output boat, 23... Drive circuit, 24... Female, 25... Cloth edge detection sensor. Figure Figure Figure Figure Figure

Claims (1)

[Claims] 1. Feed the sewn cloth by the presser foot and cloth feed of the cloth feed cylinder, cut the empty ring formed at the end of the cloth by sucking it with a suction thread cutting device installed on a table, and then move the cloth to the cloth feed cylinder. In the fabric conveying device of the automatic thread cutting sewing machine, the fabric feeding cylinder is provided with a solenoid valve that causes the fabric feeding cylinder to perform slow feeding and fast feeding, and the empty ring formed in the fabric is cut by thread cutting. A fabric conveying device for an automatic thread trimming sewing machine characterized by automatically feeding the fabric to the suction position of the device.