JP2868580B2 - Automatic sewing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic sewing apparatus that performs relative movement of a work cloth and a sewing machine in X and Y directions in synchronization with rotation of a main shaft of a sewing machine to sew an arbitrary shape. is there.

[Prior Art] The following automatic sewing devices are known as conventional examples.

First, an automatic sewing device (first conventional example) shown in FIG. 5 will be described.

This apparatus comprises a press 2 supported on an XY table for an immobile sewing machine 1 and an X-axis motor 4 and a Y-axis motor 5.
XY drive. In this apparatus, the rotation state of the sewing machine spindle motor 3 for rotating the sewing machine spindle is monitored by a sensor 15 and processed by a signal processing circuit 16, and the result is transmitted from a central processing unit 6 to an X-axis pulse distribution via an interface 8. Unit 9, Y-axis pulse distributor
Sent to 10. Each of the distributors 9 and 10 sends X- and Y-direction feed pulses based on the sewing shape data to the X-axis motor 4 and the Y-axis motor 5, respectively. Done. At this time, the motors are driven by drive circuits 12, 13, and 14, respectively. In this machine, after checking the result of the rotation operation of the sewing machine spindle,
Since a pulse for the Y-direction feed is generated, a delay occurs in each system. To prevent such a delay, a pulse for the XY direction feed based on the sewing shape data is generated in advance in anticipation of the delay. , By sending to the motor earlier.

Next, an automatic sewing apparatus (a second conventional example) shown in FIG. 6 will be described.

This device is of the same type as the first conventional example,
The common portions are denoted by the same reference numerals, and description thereof is omitted. This device includes a main spindle oscillator 17, a feed X-axis oscillator 18, a feed Y
Each output pulse generated from the shaft oscillator 19 drives the sewing machine main shaft motor 3, the X-axis motor 5, and the Y-axis motor 6, respectively. In order to sew an arbitrary shape pattern, this apparatus obtains a pulse having a frequency corresponding to the rotation speed of the main shaft of the sewing machine and a feed amount of each component in the X and Y directions by calculating and operating the central processing unit 6. 17,
18, 19, the feed X-axis frequency divider 20 and the feed Y-axis frequency divider 21 are adjusted to create pulses of respective frequencies to be applied to the X-axis motor drive circuit 13 and the Y-axis motor drive circuit 14, The pulses are counted by each circuit of the feed X-axis counter 22 and the feed Y-axis counter 23, and the output frequency of the pulses is smoothed so that the intermittent section of the pulse output is eliminated, that is, the number of pulses corresponding to the feed amount. The number of pulses is controlled so that only the output is performed, and the sewing machine spindle, feed X-axis, feed Y
The three shaft motors 3, 5, 6 are driven synchronously (second conventional example).

[Problems to be solved by the invention]

In the first conventional example, the XY direction feed is performed intermittently,
Since the stop, operation, and stop of the XY table are frequently repeated, when the rotation speed of the main shaft of the sewing machine increases, the XY table pulsates, thereby deteriorating the quality of the sewing product or reducing the mechanical strength of the device. There is a problem. Further, these processes are performed by software. However, when the sewing speed of the sewing machine is increased, there is a problem that it becomes difficult for the software processes to temporally follow the sewing speed of the sewing machine.

In the second conventional example, since the drive circuits 12, 13, and 14 of the respective motors are adjusted by the instruction of the central processing unit 6, the setting of the operation delay time can be made equal and shorter.
Since the delay of the directional feed from the main shaft of the sewing machine can be ignored, it is not necessary to take special measures as in the first conventional example. However, there is a problem in that software for managing the operation of the frequency by the central processing unit 6, the operation of each of the oscillators 17, 18, 19, each of the frequency dividers 20, 21, and each of the counts 22, 23 becomes complicated. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic sewing device that can perform high-speed sewing reliably with a relatively simple device.

B. Configuration of the Invention [Means for Solving the Problems] In order to achieve the above object, an automatic sewing apparatus according to the present invention includes a spindle motor 3 for driving a sewing machine spindle, and an X-axis and a Y-axis of an XY table. An automatic sewing device that includes feed motors 4 and 5 that are driven based on feed amount data and continuously moves a work cloth or a sewing machine relative to each other in the X and Y directions during one rotation of a sewing machine main shaft to perform sewing of an arbitrary shape. A programmable oscillator 7 that outputs a pulse signal having a frequency that is constant and proportional to the sewing speed, and a drive circuit 12 that drives and controls the spindle motor 3 with the output signal. A counter 11 that counts the number of pulses output per rotation of the sewing machine spindle and generates one synchronization signal.
And X of one stitch stored in advance by the synchronization signal.
Means 8 for outputting each feed amount data of the axis and the Y axis respectively
And pulse distributors 9 and 10 for dividing the pulse signal output from the programmable oscillator 7 based on the output data into pulse signals corresponding to the respective feed amounts on the X axis and the Y axis. Drive circuits 13 and 14 for controlling the driving of the feed motors 4 and 5 for the Y axis are provided.

(Operation)

In the automatic sewing apparatus configured as described above, the drive circuit of the sewing machine spindle is supplied from the programmable oscillator 7.
A position command pulse is issued to 12, and a reference pulse is issued to each drive circuit 13, 14 of each of the X-axis and Y-axis feed motors 4, 5. When the counter 11 issues a synchronization signal, X
The data of the axis and the Y axis are set in the respective pulse distributors 9 and 10. While the next synchronizing signal is issued from the pulse distributors 9 and 10, the reference pulse is n / 64 pulses based on the input feed amount data n (n; 0 to 63) of the X-axis and the Y-axis. Are output to the drive circuits 13 and 14 of the feed motors 4 and 5 for the X axis and the Y axis.

〔Example〕

 An embodiment will be described with reference to FIGS.

FIG. 1 shows an X-axis motor 4 and a Y-axis motor 5 for a presser 2 supported on an XY table with respect to a stationary sewing machine 1.
In the present invention, the cloth supporting side is immovable, and the sewing machine is XY-driven with respect to the cloth.
The present invention can also be applied to a Y-drive type. Here, the former type will be described for convenience.

First, description will be made with reference to FIG. 1 and FIG. 2 which is a circuit diagram thereof.

Reference numeral 6 denotes a central processing unit that performs various controls and processes.
8 is an interface.

Reference numeral 7 denotes a programmable oscillator which is controlled by the central processing unit 6 and has a constant number of pulses per rotation of the main shaft of the sewing machine and can define an arbitrary transmission frequency and a transmission frequency proportional to the sewing speed. The programmable oscillator 7 outputs a pulse serving as a position command pulse to the drive circuit 12 of the main shaft of the sewing machine. Further, the programmable oscillator 7 also issues reference pulses to the X-axis and Y-axis pulse distributors 9 and 10.

The pulse distributors 9 and 10 convert the reference pulse to n / 6 based on the input feed amount data n (n; 0 to 63) of the X-axis and Y-axis.
Distribute as 4 pulses. Such an operation is called frequency division.

Synchronization in the X and Y directions at each needle stick angle is achieved by using a pulse counter 11.

The feed pulses distributed by the pulse distributors 9 and 10 are sent to the feed X-axis drive circuit 13 and the feed Y-axis drive circuit 14, respectively, to drive the X-axis motor and the Y-axis motor. At this time, the work cloth continuously moves during one rotation of the main shaft of the sewing machine.

FIG. 3 shows the relationship between the phase of the needle bar and each signal.
Further explanation will be given.

In this figure, pulse is a position command pulse sent to the drive circuit 12 of the main shaft of the sewing machine or a reference pulse sent to each drive circuit 13, 14 of each of the feed motors 4, 5 for the X-axis and Y-axis, and Timer Out is a counter. XDAT is the X-axis feed amount data output from the interface 8, XDIR is the rotation direction data of the X-axis motor output from the interface 8, and XCCW is the counter clock to the X-axis motor. A direction command pulse, XCW is a clockwise command pulse to the X-axis motor, YDAT is Y-axis feed amount data output from the interface 8, YDIR is a rotation direction data to the Y-axis motor output from the interface 8, YCCW is a counterclockwise command pulse to the Y-axis motor, and YCW is a clockwise command pulse to the Y-axis motor.

Each of the X-axis and Y-axis distributors 9 and 10 (SN7497, 6-bit frequency divider; Texas Instruments pulse thinning circuit) converts the reference pulse into a pulse number corresponding to the X-axis and Y-axis feed amounts. And to the drive circuits 13 and 14 of the X-axis and Y-axis motors 4 and 5, respectively. That is, a reference pulse is output as n / 64 pulses based on a pulse n (n is 0 to 63) which is a feed amount data of a 6-bit code input to the pulse distributors 9 and 10 from the interface 8. .

Now, it is assumed that an m-pulse position command pulse is sent to the drive circuit 12 of the sewing machine spindle to rotate the sewing machine spindle once (from the time when the needle pierces the work cloth to the next time).
The -Y feed is to feed the work cloth a mm relatively to the needle with one position command pulse. Here, if the feed amount data of n = 0 is given to the pulse distributors 9 and 10, the rotation of the sewing machine is performed by m × a × 0/64 = 0 mm for one rotation, and the feed amount data of n = 1 is given. Move mx a x 1/64 mm for one rotation of the sewing machine. When the feed amount data of n = 63 is given, the sewing machine moves by m × a × 63/64 mm for one rotation.

The method of synchronizing with each needle stick angle using the pulse counter 11 is as follows. That is, the Ti shown in FIG.
When the rising signal (synchronous signal) of mer Out is issued, the data of the XDAT, XDIR, YDAT, and YDIR are set in the distributors 9 and 10. Upon detecting the synchronization signal, the central processing unit 6 outputs the X and Y feed data from the interface 8 until the next synchronization signal is issued at the time of the next needle stick. This makes it possible to easily synchronize the three motors.

Thus, at the time of the first needle insertion, X
Data corresponding to each feed amount of the axis and the Y axis is written, and data (0, 0) for stopping feed at the last needle stick
Is written, each feed of the X axis and the Y axis can be synchronized with the movement of the main spindle of the sewing machine.

Assuming that a straight line having a constant pitch feed amount is sewn, the result is as shown in FIG.

That is, the rotation speed of the sewing machine slows down, continues sewing at a constant speed, and slows down when it stops. 1
With a needle, mx a x XDAT / 64mm in the X-axis direction,
mxaxYDAT / 64mm sewing will be done.

As described above, since the central processing unit 6 only needs to manage the operation of the main shaft of the sewing machine by giving a command to the programmable oscillator 7, not only simplification of the software can be achieved, but also synchronization can be easily achieved. The central processing unit 6
, The delay time of each system can be ignored by adjusting the gains of the drive circuits 12, 13, and 14 equally.

C. Effects of the Invention Since the present invention is configured as described above, it has the following effects.

In other words, it is possible to reliably synchronize each motor, and even if the sewing speed greatly changes in a short time, such as when starting or stopping, there is no shift in the feed operation, and sewing can be performed smoothly, There is no pulsation of the table even during high-speed driving. Further, since a driving pulse generation source for each motor is unnecessary, the circuit configuration and software can be extremely simplified, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a drive system diagram of an automatic sewing apparatus for XY driving a press supported on an XY table with respect to a stationary sewing machine,
FIG. 2 is a circuit diagram thereof, FIG. 3 is a diagram showing the relationship between the phase of the needle bar and each signal, and FIG. 4 is a diagram showing the phase of the needle bar and the rotation speed of each motor in the linear sewing at a constant pitch feed amount. FIG. 5 is a drive system diagram of a conventional automatic sewing device, and FIG. 6 is a drive system diagram of another conventional automatic sewing device. 3 ... sewing machine spindle motor, 4 ... X-axis motor, 5 ...
... Y-axis motor, 6 ... Central processing unit, 7 ... Programmable oscillator, 9, 10 ... Pulse distributor, 11 ... Counter, 12 ... Sewing machine spindle motor drive circuit, 13 ... X-axis motor drive circuit , 14 ... Feed Y-axis motor drive circuit

Continuation of the front page (72) Inventor Tsugio Kubota 1-2-2 Kokuryo-cho, Chofu-shi, Tokyo Juki Corporation (56) References JP-A-63-154193 (JP, A) JP-A-63-194695 ( JP, A)

Claims (1)

(57) [Claims] 1. A spindle motor 3 for driving a sewing machine spindle;
A feed motor for driving the X-axis and the Y-axis of the XY table based on the feed amount data, respectively, and continuously moving the work cloth or the sewing machine in the X-Y directions during one rotation of the main shaft of the sewing machine; In an automatic sewing apparatus that performs sewing of an arbitrary shape by moving the sewing machine, a programmable oscillator 7 that outputs a pulse signal having a constant number of pulses per one rotation of the sewing machine main shaft and a frequency proportional to the sewing speed, and a main shaft motor 3 based on the output signal. A drive circuit 12 for controlling the drive, a counter 11 for counting the number of pulses per one rotation of the sewing machine spindle output from the programmable oscillator 7 and generating one synchronization signal, and for one stitch stored in advance by the synchronization signal X axis, Y
Means 8 for outputting each feed amount data of the axis, and a pulse distributor for dividing the pulse signal output from the programmable oscillator 7 into pulse signals corresponding to the respective feed amounts of the X and Y axes based on the output data. 9 and 10, and the output pulse of each of the X-axis and Y-axis feed motors 4,
5. An automatic sewing apparatus including drive circuits 13 and 14 for controlling the drive of the sewing machine 5.