JPS5913232B2 - sewing equipment - Google Patents

Description

[Detailed description of the invention] This invention sets a series of sewing processes in advance in a program,
The present invention relates to a sewing device that automatically performs a sewing process according to its program.

Conventional sewing devices, such as sewing machines, use a pedal switch to drive and stop the sewing machine motor after the workpiece is set on the sewing machine bed and the sewing machine motor is driven and stopped. It is difficult to stop the sewing machine correctly at the end of sewing, resulting in overstitching or understitching, or to prevent this, the driving speed is reduced when the sewing machine approaches the end of sewing.

If you overstitch, even if you retouch it, there will be holes in the workpiece, which will make it look bad and reduce the value of the product.If you don't have enough stitches or if you slow down the drive speed, work efficiency will decrease, which is bad. It wasn't.

This invention was made in view of the above points, and by setting a series of sewing processes in advance and driving the sewing machine according to the settings, it is possible to finish sewing at the correct position and also to operate a switch. This allows for a temporary stop in the middle of the sewing process, except for the tacking process.

The details of this invention will be explained below according to the illustrated embodiments.

That is, in FIG. 1, 1 is a sewing machine body, 2 is a variable speed drive motor that drives a main shaft provided in the sewing machine body via a pulley 3, 4 is a controller for this drive motor,
5 is a program control device for operating this drive motor controller; 6 is an operation section having an input section for setting a series of sewing process programs in this program control device; and a display section for displaying the operating status of the program control device; 7 detects the upper or lower position of the sewing machine needle, generates a pulse every time the needle moves, and sends the output to the program controller 5.
A needle position detecting device 8 is inputted to the sewing machine main shaft speed detecting device 8, and its output is also inputted to the program control device 5.

Reference numeral 9 denotes a pedal switch that turns on and off the device and adjusts its speed depending on the amount of depression and amount of depression.

The program control device will be further explained with reference to FIG.

Reference numeral 11 is an input section provided in the operation section 6. By operating the input section 11, a series of sewing process programs such as tacking, straight or curved tacking, thread cutting, etc. can be set.

Reference numeral 10 denotes a storage section that stores the program set by the input section 11, and the sewing distance of each step is determined by the number of stitches.

Reference numeral 12 denotes a command unit that reads out the program content from the storage unit 10, counts the number of stitches pulses from the needle position detection device 1, compares it with the program content, and controls operation commands, and outputs from this command unit. displays the order of the sewing process being executed and the number of stitches thereof on the display section 13 of the operation section 6.

14 is an output command circuit unit that issues an output command based on the output from the command unit; 4 is a controller that controls the drive motor in various modes based on the output of the output command circuit unit as described above; 1
Reference numeral 5 denotes a stop command signal circuit that generates a stop command signal when the pedal switch 9 is turned off, and its output is input to the command device section 12.

When the command unit 12 receives this stop command signal, it compares it with the contents of the program being executed, and outputs the tack stitching process command as is during the tack stitching process, and outputs the stop command during other processes. Output.

In the apparatus configured as described above, a series of sewing processes such as locking straight line or curved stitching and locking thread cutting are previously stored in the storage unit 10 by the input unit 11.

At this time, the drive motor 2 is set at a constant speed of 1,400 (r, p, m) for the tacking stitching process at the beginning and end of sewing.

Then, when the object to be sewn is set on the sewing machine bed and the pedal switch 9 is turned on, a command is issued from the command device section 12 according to the program content from the storage section 10, and this causes the third
As shown in Figure A, the motor 2 is operated at 1,400 (
r, p, m) when sewing straight lines at high speed (in this case, 4,0
00 (r, p, m)), and when the sewing is completed, a stop command signal e is output from the output command circuit section 14 in response to the signal C from the command device section 12, and the drive motor 2 is stopped.

At this time, the pedal switch 9 is turned on as shown in FIG. 3C.

However, during this series of sewing processes, there may occur cases where it is desired to temporarily stop the sewing process due to breakage of the upper thread or lower thread, a mistake in the sewing part, or other reasons.

In that case, press pedal switch 9. When b is turned off, the stop command signal circuit section 15 operates as shown in FIG. 4, and this signal is input to the command device section 12 and compared with the program content, and except during the tacking stitching process, the stop command signal circuit section 15 operates as shown in FIG. 4 d. A stop command is issued from the output command circuit section 14 to stop the drive motor 2.

The reason why the drive motor 2 does not stop even if the pedal switch 9 is turned off during this tacking process is that the cloth feed speed of the sewing machine changes depending on the speed of the drive motor 2, so when the sewing distance is short as in the tacking process, This is because the tacking distance changes, resulting in an unsightly appearance, and because the drive motor 2 does not stop immediately due to inertia, the stitches advance two to three stitches, which is a problem.

Furthermore, when the drive motor 2 is stopped due to the pedal switch 9 being turned off, the other parts of the program control device 5 are designed to maintain their stopped states as they are, so that the device can be driven again by the pedal switch 9. Then, the remaining steps are automatically carried out, and at the end of sewing, the signal C from the command unit 12 is sent.
As a result, a stop command signal is output from the output command circuit section 14 and the drive motor 2 is stopped.

As described above, the present invention not only allows sewing work to be performed automatically according to a series of preset sewing processes, but also allows the sewing process to be temporarily stopped, except for the tacking stitch process, if the sewing process is desired to be stopped in the middle. Therefore, if the thread breaks or if you make a mistake in sewing, you can stop the sewing machine, make corrections, and start the automatic operation again.Furthermore, since it does not stop when sewing the tacking stitches, the speed during the tacking stitches does not change. The inconvenience caused by this will also be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of a program control device, and FIGS. 3 and 4 are timing charts showing its operation. In the figures, the same symbols indicate the same parts, 1 is the sewing machine body, 2 is the drive motor, 4 is the motor controller, 5 is the program control device, 6 is the operating section, T is the needle position detection device, and 9 is the pedal switch. be.

Claims (1)

[Claims] 1 A sewing machine body that sews the workpiece, a program that allows the sewing machine body to perform a series of sewing processes consisting of tacking stitches, straight line stitches, or curved stitches can be set, and a program control that operates the sewing machine body according to the set program. a switch that generates a stop command signal to temporarily stop the sewing machine body being operated by the program control device in the middle of the sewing process; The present invention is characterized by being equipped with a command unit that checks the program being input and is being executed while waiting for the input of this signal, and outputs the tacking process command as it is during the tacking process, and outputs a stop command during other processes. sewing equipment