JPS6321094A - Drive apparatus of sewing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sewing machine drive having a fixed position stop function.

Conventional technology In recent years, there has been a strong demand in the sewing industry for improvements in workability, quality, and cost reduction.

For example, when sewing with a chain stitch sewing machine as shown in Figure 6, you first stop stitching part A at part B and turn the fabric to sew part 6, but the threads are tangled, so it is easy to sew part 6. I can't turn it.

Therefore, in section B, in order to remove the needle from the cloth, turn the sewing machine to the needle-up position, pull the cloth a little to loosen the thread, turn the cloth, and then
Alternatively, when raising the needle to the upper position, the sewing machine boot was turned in the opposite direction by hand to untangle the thread, then the fabric was turned, and the 0th section was sewn.

Problems to be Solved by the Invention As described above, in the conventional method, workability has been significantly impaired due to actions such as forcibly pulling the cloth by hand or turning the sewing machine by hand.

In view of the above-mentioned problems, the present invention has been developed to easily reverse the sewing machine by operating a switch or a pedal to remove entanglement of thread (Madoki, 8
An object of the present invention is to provide a sewing machine drive device that can improve the workability of tearing.

Means for Solving the Problems In order to solve the above-mentioned problems, the sewing machine drive device of the present invention has a sewing machine drive device that maintains a command to drive the motor after receiving an operation to drive or stop the motor until the motor is stopped. The rotation direction command means includes a first drive means and a second drive means for instructing and driving a rotation direction opposite to the rotation command.

Operation The present invention has the above-described configuration, whereby the first drive means is operated by depressing the pedal of the sewing machine, and the second drive means is operated by depressing the pedal of the sewing machine or by using a knee switch. You can control forward and reverse rotation using the pedal and knee switch. As a result, the user can untangle the threads of the sewing machine while keeping both hands on the fabric, improving work efficiency.

Embodiment Below, a sewing machine driving device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a sewing machine driving device in a first embodiment of the present invention.

In the figure, 1 is a control device that controls rotation and stopping of the motor 2, 3 is a speed signal generator that detects the speed of the motor 2 and outputs a speed signal, 4 is a speed judgment means, and 5.6 is a speed command switch. switching means, 7 is a second speed setting device, 8 is OR
circuit, 9 is a first flip-flop, 10 is a second flip-flop, 11 is a first needle position detection means, 12 is a second needle position detection means, 13.14.15 is an AND circuit,
16 is a first speed setting device, 17 is a first pedal position determining means, 18 is a second pedal position determining means, and 19 is a pedal of the sewing machine.

FIG. 2 shows a layout diagram of a general sewing machine and a sewing machine driving device.

In the figure, 20 is a connecting rod, 21 is a sewing machine, 22 is a table, 23 is a belt, and 24 is a leg.

FIG. 3 shows a sequence time chart showing the operation of the first embodiment.

Regarding the sewing machine drive device configured as described above, the first
The operation will be explained using FIG. 2, FIG. 3, and FIG.

Normally, the sewing machine 21 is connected to the motor 2 via a belt. In FIG. 1, the first speed setting device 16 is operated via the seven connecting rods 20 by pressing the pedal 19 to generate a voltage. The voltage generated when the pedal 19 is depressed operates the first pedal position determining means 17, and when the first flip-flop 9 (hereinafter referred to as FFI) is in the reset state, A'
The NDu path 15 opens and the second flip-flop 10 (hereinafter referred to as FF2) is set, and the first switching means 6 is turned on to command the control device 1 to use the voltage of the first speed setter 16 as a speed command. do.

Then, by feeding back the signal of the speed signal generator 3 to the control device 1 via the motor 2, the sewing machine 21 connected to the motor 2 by a belt, and the speed signal generator 3, the sewing machine 21 is set to the first speed. It rotates at a speed corresponding to the voltage of the setting device 16. When you release the pedal 19 and put it in neutral, the first
The pedal position determining means 17 becomes inoperative and the first switching means 6 is turned off. However, the F that was set first
Since F2 turns on the second switching means 5 through the OR circuit 8, the motor 2 rapidly decelerates to the speed set by the second speed setting device 7. The second speed setter 7 is set at a low speed so that the motor can be stopped at a fixed position. When the speed determining means 4 determines that the speed of the sewing machine is low, the AND circuit 13 is opened, and when the second needle position detecting means 12 detects the stop position, the FF 2 is reset and the second switching means 5 is turned off. Then, since the speed command becomes zero, the motor 2 stops.

When the pedal 19 is pressed again, the first speed setting device 16
The voltage of F operates the second pedal position determining means 18, and the voltage of F
When F2 is in the reset state and the speed determining means 4 determines that the sewing machine is running at a low speed, FF1 is set and the second switching means 5 is turned on through the OR circuit 8, and FF1 is set to the control device. A rotation direction command is output to 1. As a result, the sewing machine rotates at the speed set by the second speed setting device 7 in the opposite direction to the pedal depression. and,
When the first needle position detection means 11 detects the stop position, the FF
The sewing machine is stopped by resetting I and turning off the second switching means 5.

As described above, according to the first embodiment, in a conventional sewing machine drive device having a fixed position stop function, by commanding the rotation direction with a flip-flop that maintains the drive from the pedal depression to the fixed position stop, When sewing, it is driven by pressing the pedal, and when rotating the fabric, the needle is raised in reverse by pressing the pedal again. It can be operated using only the pedals.

FIG. 4 shows a second embodiment of the present invention, which differs from FIG. 1 in that a timer 25 is inserted between the FFI and the rotation direction command input of the control device 1 in the first embodiment.

This is because, as shown in Figure 3 (b), the actual rotation direction and the rotation direction command are reversed during T1, so depending on the flna of the motor, there may be inconveniences such as excessive current flowing or not being able to stop. Since this may occur, the rotation direction command is extended by a time longer than the time T1 until stopping.

FIG. 5 shows a third embodiment of the present invention. In the first embodiment, a flip-flop 26 (hereinafter referred to as FF3) is provided between the FF1 and the rotation direction command input of the control device 1. Set it with FFI and command the rotation direction in that state. Resetting is performed when FF2 is set.

With the above configuration, even if the time TI until stopping changes depending on the inertia of the sewing machine, it will not be affected.

In the embodiment, the second pedal position determining means 18 is operated by pressing the pedal again, but the input may be made using a knee switch or the like.

Furthermore, the speed signal generator 3 may detect either the speed of the motor 2 or the speed of the sewing machine. Further, the driving may be stopped without stopping at a fixed position.

Effects of the Invention As described above, the sewing machine drive device of the present invention provides a first command for operating the drive/stop of the motor, an instruction for the reverse direction of rotation,
By having the second driving command, normal sewing can be performed by depressing the pedal, and needle raising operation can be performed by depressing the pedal or turning halfway by pressing the knee switch, which is effective in improving workability in sewing.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a sewing machine drive device in a first embodiment of the present invention, FIG. 2 is a front view showing the overall arrangement of the sewing machine and the sewing machine drive device, and FIG. 3 is a time chart showing the operation of FIG. 1. , FIG. 4 is a block diagram showing the second embodiment, FIG. 5 is a block diagram of the sewing machine driving device of the third embodiment, and FIG. 6 is an explanatory diagram showing an example of seams of a sewn product. 1...Control device, 2...Motor, 3.
... Speed signal generator, 11.12 ... Needle position detection means, 16 ... Speed setting device, 17 ...
... Pedal position determination means, 21 ... Sewing machine. Name of agent: Patent attorney Toshio Nakao and one other person Figure 1 Figure 2 1-1%lI$Uni2---Mo-
7.
Figure 3 (a) Figure t

Claims (3)

[Claims] (1) A motor that drives the sewing machine, a needle position detector that detects the needle position of the sewing machine, a speed signal generator that detects the speed, a control device that controls rotation and stopping of the motor, and a control device that controls the rotation and stopping of the motor. and rotation direction command means for outputting a rotation direction command signal for commanding the rotation direction, and the rotation direction command means continues to command the motor drive from when it receives an operation to stop driving the motor until the stop is completed. A sewing machine drive device comprising: a first drive means for rotating the sewing machine; and a second drive means for instructing the control device to rotate in a direction opposite to the direction of rotation by the first drive means. (2) The sewing machine drive device according to claim 1, wherein the rotation direction command means includes a timer that continues for a certain period of time even after the command by the second drive means is completed. (3) The rotational direction command means is configured to control the rotation direction after the command from the first drive means is completed until the command from the second drive means is received, and after the command from the second drive means is completed, the rotation direction command is performed by the first drive means. 2. The sewing machine driving device according to claim 1, further comprising storage means for storing rotational direction commands until the commands are issued.