JP2646538B2 - Sewing machine drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine driving device having a fixed position stopping function.

2. Description of the Related Art In recent years, the sewing industry has been strongly demanded to improve workability, automate work, and systematize, and it has become necessary for a sewing machine drive device to be able to operate a sewing machine only by a signal.

In recent years, the sewing machine is rotated in both directions of a driving source, the sewing machine is driven while the sewing machine is driven in one rotation direction, the sewing operation is performed, and only the feed mechanism is driven in the other rotation direction to drive the cloth. Automatic sewing machines that return the sewing machine to such a position have been put to practical use.

Conventionally, this type of automatic machine has been constituted by two motors, a motor as a sewing machine driving source for sewing and a motor for returning a cloth feed mechanism.

Hereinafter, the above-described conventional sewing machine driving device will be described with reference to the drawings.

FIG. 8 shows a conventional sewing machine driving device and an overall layout of the sewing machine, wherein 1 is a sewing machine, 2 is a position detecting means for outputting a needle position signal of the sewing machine, and 3 is an output shaft and a feed shaft of a motor 9. 7, a belt for transmitting power between the feed shaft 7 and the sewing machine main shaft, 4 is a pulley, 5 is a feed clutch, 6 and 12 are feed mechanisms of the cloth feed table 11, 8 is a sewing product, 9 is a motor,
Reference numeral 10 denotes a control device for controlling driving of the motors 9 and 15, 13 denotes a return mechanism of the table 11, 14 denotes a return clutch, and 15 denotes a return motor. The conventional sewing machine driving device includes control of the return clutch 14 and the return motor 15 and its control.

The operation of the sewing machine driving device configured as described above will be described below.

First, when sewing the product 8 to be sewn, the feed clutch 5 is used.
Is connected, the return clutch 14 is released, and the sewing machine 1 and the table 11 are driven by the motor 9. The motor 9 is a control device 10 capable of controlling a stop position in accordance with a signal from the position detecting means 2.
Driven / stopped by When sewing is performed to the sewing end position, a sewing end sensor (not shown) operates to stop the sewing machine 1 at the needle upper position. Next, the feed clutch 5 is released, the return clutch 14 is connected, the return motor 15 is driven,
Return sewing 11 until the sensor (not shown) starts to work.

As described above, the sewing motor 9 and the feed clutch 5,
Then, the returning motor 15 and the returning clutch 14 are alternately operated to perform the sewing operation.

Problems to be Solved by the Invention However, such a configuration requires two motors and two clutches, which is uneconomical, and also requires that each of them adjusts the timing and requires complicated control. was there.

The present invention has been made in view of the above problems, and provides a sewing machine driving device which can be driven forward and backward by one motor and has driving means that is easy to operate.

Means for Solving the Problems In order to solve the above problems, the sewing machine driving apparatus according to the present invention can reverse the rotation direction of the motor by the first and second drive commands. It is provided with speed control means configured not to control the stop position.

Action The present invention has one configuration for sewing and returning for sewing with the above-described configuration.
With just one motor. That is, for example, as a sewing motor for controlling the stop position by the needle position signal by the first drive command, the second drive command rotates in the direction opposite to the direction for sewing,
In addition, since the stop position is not controlled, it can be used as a return motor for applying a brake and stopping as soon as the drive command ends.

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

FIG. 1 is a block diagram showing a sewing machine driving apparatus according to a first embodiment of the present invention.

In the figure, 16 is a speed control means, 1 is a sewing machine, 2 is a position detecting means, and in this embodiment, outputs two needle position signals of a needle upper position and a needle lower position. 9 is a motor. The motor uses a DC brushless motor in the embodiment, and includes a speed signal generator 17 which outputs two speed signals having a phase difference of 90 degrees in proportion to the rotation speed of the motor.

The speed control means 16 controls the speed of the motor 9 while judging the rotational direction based on the two speed signals, a motor driving means 18, a speed discriminating means 19, speed setting devices 20, 21, 22 and outputs of the speed setting devices. Switching means 23, 24,
25, flip-flops 26, 27, 28 and the like. Reference numeral 30 denotes a sewing clutch driven by a command at the time of sewing.

FIG. 2 is an overall arrangement diagram of the sewing machine driving device and the sewing machine in the present embodiment. In FIG. 2, reference numeral 30 denotes a sewing clutch.

The operation of the sewing machine driving device configured as described above will be described below with reference to FIGS. 1, 2, and 3.

First, the table 11 for feeding the sewing product shown in FIG.
And reciprocates as the motor rotates left and right. Sewing machine 1 must be rotated in one direction only due to structural limitations forming the seam. Therefore, in the rotation direction for forming the seam, the sewing clutch 30 is connected by the command at the time of sewing, and the sewing machine 1 and the table 11 are connected.
Move in synchronization. "Send" the operation of this table 11
That. In the rotation direction where no seam is formed, the sewing clutch 30 is released, and only the table 11 is moved. The operation of the table 11 is called “return”. When returning, the needle of the sewing machine must be released from the sewing product. Therefore, when the sewing operation is completed and stopped, the needle stop position is controlled to stop at the needle upper position according to the position detecting means 2. This is called “fixed position stop”. Although the end of the return operation is not shown, the drive command of “return” is turned off by a signal from a sensor or the like that detects the end of the sewing product 8. At this time, the brake is immediately applied and the motor 9 is stopped.

Next, the operation of the motor 9 will be mainly described with reference to FIGS.

Speed judgment means for judging a signal from the speed signal generator 17
Reference numeral 19 outputs a signal "stop" when stopping and a signal "low speed" when stopping at a fixed position. “Low speed” is output when the rotation speed of the motor becomes equal to or lower than the speed set by the speed setting device C20.

When the drive command A is input, FF1 is set by the output of FF1 and FF2 and the AND circuit except when the drive command B is being driven. Further, the driving command A controls the switching means A25 and transmits the command of the speed setting device A22 to the motor driving means 18. FF3 at the same time
Is also set to control the switching means C23 to transmit the command of the speed setting device C20 to the motor driving means 18. Then, the output of FF1 is connected to the sewing clutch 30 as a sewing command, and at the same time, the motor driving means 18 is commanded so that the sewing machine 1 is in a rotation direction for forming a stitch, and the motor 9 is rotated to perform sewing.

Although not shown, a sensor for detecting the end of the cloth or a sewing end sensor for detecting that the required length has been sewn is operated, and when the drive command A is turned off, the switching means A25 is opened and the motor 9 is turned off. The speed is rapidly reduced to a low speed by the speed setting device C20. Then, when the speed judging means 19 outputs "low speed" and the needle up signal is inputted, FF3 is reset, the switching means C23 is opened and the motor 9 stops.

When the motor 9 stops, the speed judging means 19 outputs "stop" and resets FF1. To reset FF1, release the sewing clutch 30 and the rotation direction command will also be in the "return" direction.
Return to the initial state.

The drive command B sets FF2, and the motor is driven by the speed command of the speed setting device B21 by the switching means B24. The rotation direction at this time is the same “return” direction as the initial state.

Although not shown, when the sewing start sensor operates, the drive command B is turned off, and the motor rapidly decelerates and stops.
When stopped, FF2 is reset and returns to the initial state.

By repeating the above operations, the following sewing system can be configured.

In FIG. 4, the sewn product 8 is set at the point A, and is returned to the sewing start position at the point B by the drive command B. Drive command A from point B
Sewing up to point C. Return from point C to point D by drive command B. At this time, the feeding in the direction F is performed by another mechanism.

The above operation is repeated up to point E, the work to be sewn is replaced, and the operation is performed again from point A.

As described above, according to the present invention, the drive command A and the drive command B in which the rotation directions of the motors are opposite to each other are provided, and the drive command B is configured not to have a fixed position. Can be used for the sewing operation and the return operation of the sewing product feed table.

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is a block diagram of a sewing machine driving apparatus according to a second embodiment of the present invention. 1 is different from FIG. 1 in that an R circuit 31 which takes the logical sum of the drive command A and the drive command B, and an AN which takes the logical product of the needle down signal of the position detecting means 2 and the R circuit.
That is, the D circuit 32 is provided.

The operation of the sewing machine driving device configured as described above will be described below.

In the first embodiment, the driving command A sets FF3 to stop at a fixed position, and the driving command B does not stop the fixed position. However, in the second embodiment, the driving commands A and B The difference is that the fixed position stop is enabled in both cases through the R circuit 31. However, because of the presence of the AND circuit 32, FF3 is not set unless the drive command A or B is input and the needle down position signal is input from the position detection means 2, and the fixed position stop is not performed.

As described above, the output of the R of the drive command A and the drive command B and the FF3 for stopping the fixed position by the AND of the needle down signal are set, so that the sewing machine is connected by the connection of the sewing clutch when the drive command is issued. When the turning needle lower position signal is output, stop at the fixed position and release the sewing clutch to
When the needle down position signal is not output with the sewing machine stopped, the presence or absence of the fixed position stop can be automatically switched depending on the presence or absence of the needle position signal, such that the fixed position stop is not performed.

Hereinafter, a third embodiment of the present invention will be described with reference to the drawings.

FIG. 6 is a block diagram of a sewing machine driving apparatus according to a third embodiment of the present invention. 5 is different from the configuration of FIG. 5 in that the output of FF1 is input to the rotation direction command input of the motor driving means 18 and the exclusive OR EX,
The point is that the input is made via R33.

 Hereinafter, the operation will be described.

When drive command A sets FF1, the output changes,
The rotation direction is commanded depending on whether it is "H" or "L". However, the exclusive-OR of the rotation direction setting unit 34
Since the rotation direction is instructed to 18, the instruction is as shown in FIG.

If FF1 is set and the output is "L" and the corresponding rotation direction is CCW, command CCW when the rotation direction setting device is CCW, and command CW when the rotation direction setting device is CW. Operate.

When FF1 is reset and the output is "H" and the rotation direction is CW, the operation is performed so as to instruct CW when the rotation direction setting device is CCW and CCW when the rotation direction setting device is CW. Since the drive command B is input when the FF1 is reset, this is also the rotation direction of the drive command B.

As described above, the FF that determines the rotation direction by the drive command A
By providing a configuration for commanding the rotation direction to the motor drive means by the exclusive OR of the output of 1 and the rotation direction setting device, the drive command A and the drive command B can be changed without changing the circuit.
Can be exchanged by a rotation direction setting device.

In the first embodiment, the rotation direction is instructed by the output of FF1, but it may be Q output or those of FF2.
Alternatively, FF4 may be provided, set by drive command A, reset by drive command B, and command the rotation direction by the output of FF4.

In the second embodiment, the presence / absence of the needle down signal determines the presence / absence of the stop at the fixed position. However, the stop may be performed by changing the needle up signal. The stop at the fixed position may be performed when the number is more than the number.

Further, a plurality of drive inputs A and B may be provided, respectively. Therefore, a plurality of switching means A, B and speed setting devices A, B may be provided.

Effect of the Invention As described above, the present invention has a configuration in which drive inputs having different rotational directions from each other are provided, and one of them or a required one is provided with a fixed position stop so that one motor can be controlled by a sewing machine. The sewing machine can be used for sewing and driving other than sewing, such as returning a table, and has the effect of simplifying the configuration of an automatic machine using a sewing machine.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a sewing machine driving apparatus according to a first embodiment of the present invention, FIG. 2 is an overall layout diagram of the sewing machine driving apparatus and the sewing machine of the present invention, and FIG. FIG. 4 is a time chart showing the operation of the sewing machine driving device of the first embodiment, FIG. 4 is a diagram showing sewing means using the sewing machine driving device of the first embodiment, and FIG. 5 is a sewing machine drive of the second embodiment. FIG. 6 is a block diagram of the sewing machine driving device of the third embodiment, FIG. 7 is a diagram showing a truth table of exclusive OR,
FIG. 8 is a diagram showing the general arrangement of a conventional sewing machine driving device and a sewing machine. DESCRIPTION OF SYMBOLS 1 ... Sewing machine, 2 ... Position detection means, 5 ... Feeding clutch, 9 ... Motor, 10 ... Control device, 11 ... Table, 12 ... Feeding mechanism, 16 ... Speed control means, 17 ... ... speed signal generator, 18 ... motor drive means.

Claims (3)

(57) [Claims] 1. A motor for driving a sewing machine, position detecting means for detecting a needle position of the sewing machine and outputting a needle position signal, controlling a rotation speed of the motor, and controlling a stop position of the sewing machine in accordance with the needle position signal. Speed control means, wherein the speed control means is configured such that the rotation direction of the motor according to the first drive command is opposite to the rotation direction of the motor according to the second drive command. A sewing machine drive device that does not control the stop position of the sewing machine. 2. The sewing machine driving device according to claim 1, wherein the drive command of the speed control means controls the stop position only when a needle position signal is input. 3. The speed control means includes a rotation direction setting means,
The rotation direction setting means has a setting signal for determining a rotation direction in advance, and determines the rotation direction of the motor by taking an exclusive OR of the signal and a rotation direction signal according to the first and second drive commands. 3. The sewing machine driving device according to claim 1 or 2.