JPH0420369A - Automatic sewing device - Google Patents

Abstract

PURPOSE:To surely execute high speed sewing by a comparatively simply device by setting each feed amount data of the X axis and the Y axis to the respective pulse distributors by a synchronizing signal, and outputting it to each drive circuit of each feed motor of the X axis and the Y axis while the next synchronizing signal is detected. CONSTITUTION:From a programmable oscillator 7 a position instruction pulse is generated to a drive circuit 12 of a sewing machine main shaft, and a reference pulse is generated to each drive circuit 13, 14 of each feed motor 4, 5 of the X axis and the Y axis. When a synchronizing signal is generated from a counter 11, each data of the X axis and the Y axis is set to the respective pulse distributors 9, 10. From the pulse distributors 9, 10, while the next synchronizing signal is generated, a reference pulse is outputted as an n/64 pulse to each drive circuit 13, 14 of each feed motor 4, 5 of the X axis and the Y axis, based on each feed amount data (n) (n; 0-63) of the X axis and the Y axis which is inputted. In such a way, even in the case of high speed driving, a table, etc., do not pulsate.

Description

Detailed Description of the Invention A. Purpose of the Invention [Field of Industrial Application] The present invention is capable of sewing an arbitrary shape by moving a work cloth and a sewing machine relative to each other in the X-Y directions in synchronization with the rotation of the main shaft of the sewing machine. This invention relates to an automatic sewing device that performs the following steps.

[Conventional technology]

As conventional examples, the following automatic sewing devices are known.

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

This device has a stationary sewing machine 1 with a presser foot 2 supported on an X-Y table, a motor 4 on the X axis, a motor 9-5
+l: is an X-Y drive type. This device monitors the rotation state of the sewing machine main shaft motor 3 that rotates the sewing machine main shaft with a sensor 15, processes it in a signal processing circuit 16, and distributes the X-axis pulse from the central processing unit 6 via an interface 8. 9 and a Y-axis pulse distributor 10. From each distributor 9.10, pulses in the x and y directions are sent to the X axis element 4 and Y axis element 5 based on the sewing shape data, and each
- Feeding in the Y direction is performed intermittently. At this time, each motor is driven by a drive circuit 12.13, ]4, respectively. This device generates pulses for feeding in the X and Y directions after checking the results of the rotational movement of the main shaft of the sewing machine, which causes delays in each system. By anticipating the delay in advance and sending pulses for sending in the x-y direction to the monitor early, synchronization is achieved.

Next, an automatic sewing device (second conventional example) shown in FIG. 6 will be explained.

This device is of the same type as the first conventional example, and common parts are given the same reference numerals and explanations will be omitted. This device uses each output pulse generated from the sewing machine main shaft oscillator 17, the feed X-axis oscillator 18, and the feed Y-axis oscillator 19.
These drive the sewing machine main shaft motor 3, the X-axis upper motor 5, and the Y-axis upper motor 6, respectively. In order to sew an arbitrary shape pattern, this device calculates and operates a central processing unit 6 to obtain pulses of frequencies corresponding to the rotational speed of the main shaft of the sewing machine and the feed amount of each component in the X1Y directions, and generates pulses from each oscillator 17. 18.19, adjusted by the feed X-axis frequency divider 20 and the feed Y-axis frequency divider 21, and the drive circuit 13 on the X-axis
Create pulses of respective frequencies to be applied to the Y-axis drive circuit 14, count these pulses in the feed X-axis counter 22 and the feed Y-axis counter 23, and smooth the output frequency of the pulses. The three motors for the sewing machine main axis, feed Y axis, and feed Y axis are controlled so that there are no intermittent sections of pulse output, that is, so that only the number of pulses corresponding to the feed amount is output. .6
are driven synchronously (second conventional example).

[Problem to be solved by the invention]

In the first conventional example, feeding in the X-Y direction is performed intermittently, and
- Since the Y-table stops, moves, and stops frequently, when the rotation speed of the sewing machine main shaft increases, the X-Y table pulsates, which deteriorates the quality of sewn products and reduces the mechanical strength of the machine. There's a problem. Furthermore, although these processes are performed by software, as the sewing speed of the sewing machine increases, a problem arises in that the software processing becomes difficult to temporally follow the sewing speed of the sewing machine.

In the second conventional example, the drive circuits 12, 13, and 14 of each motor can be adjusted by commands from the central processing unit 6 to equalize and shorten the operation delay time settings.
- Since the delay in the feed in the Y direction relative to the main axis of the sewing machine can be ignored, there is no need to take any special measures as in the first conventional example. However, the calculation of the frequency by the central processing unit 6, each oscillator 17, 18, 19, each frequency divider 20.
21. There is a problem that the software for managing the operations of each counter 22, 23 is complicated.

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

9. Structure of the Invention [Means for Solving the Problem] In order to achieve the above object, the automatic sewing device of the present invention uses input Y-axis and Y-axis feed amount data n (n; 0 to 0).
63), the pulse distributor 9.10 outputs the reference pulse as n/64 pulse, and the pulse distributor 9,10 outputs the position command pulse to the drive circuit 12 of the main shaft of the sewing machine.
It consists of a programmable oscillator 7 that emits a reference pulse to O, and a counter 11 that emits a synchronization signal.The synchronization signal sets the Y-axis and Y-axis feed amount data in the respective pulse distributors 9 and 10, and then While detecting the synchronization signal of , it is output to each drive circuit 13.14 of each Y-axis feed motor 4.5.

[For production]

In the automatic sewing device configured as described above, the programmable oscillator 7 is connected to the sewing machine main shaft drive circuit 1.
A position command pulse is issued to the drive circuit 2, and a reference pulse is issued to each drive circuit 13.14 of each feed motor 4.5 for the X and Y axes. When a synchronization signal is issued from the counter 11, the X-axis and Y-axis data are sent to each pulse distributor 9.
．． Set to 10. From pulse distributor 9.10,
While the next synchronization signal is being issued, the reference pulse is set to n/64 pulses based on the input X-axis and Y-axis feed amount data n (n; O~63), and the X-axis and Y-axis feeds are It is output to each drive circuit 13.14 of the motor 4.5.

〔Example〕

The embodiment will be explained with reference to FIGS. 1 to 4.

Fig. 1 shows a type of sewing machine 1 in which a presser foot 2 supported on an X-Y table is driven in the X-Y direction by a rotor 4 on the X-axis and a rotor 5 on the Y-axis. This invention can also be applied to a type of sewing machine in which the cloth supporting side is stationary and the sewing machine is driven in X-Y relative to the cloth. Here, the former type will be explained for convenience.

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

6 is a central processing unit that performs various controls and processes;
is an interface.

Reference numeral 7 denotes a programmable oscillator 7 that is managed by the central processing unit 6 and can define an arbitrary oscillation frequency and an acceleration/deceleration rate for an arbitrary oscillation frequency. This 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 generates reference pulses to the X-axis and Y-axis pulse distributors 9.10.

The pulse distributor 9.10 distributes the reference pulse as n/64 pulses based on the input X-axis and Y-axis feed amount data n (n; 0 to 63).

The synchronization of the X-Y direction feeding at each needle insertion angle is achieved by using a pulse counter 11.

The feed pulses distributed by each pulse distributor 9.10 are sent to the feed X-axis drive circuit 13 and the feed X-axis drive circuit 14, respectively, to drive the X-axis top and the Y-axis top.

The explanation will be further explained with reference to FIG. 3, which shows the relationship between the phase of the needle bar and each signal.

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 feed motor 4.5 for the X-axis and Y-axis, and Timer Out is a counter pulse. The synchronization signal, XDAT, output from 11 is the X-axis feed amount data, XDIR, output from interface 8.
is the rotation direction data of the X-axis topter output from the interface 8, xccw is the counterclockwise command pulse to the X-axis topter, XCW is the clockwise command pulse to the X-axis topter, YDAT is the Y-axis feed amount data output from the interface 8, YDIR is the Y-axis rotation direction data output from the interface 8,
yccw is a counterclockwise command pulse to the Y-axis top;
YCW is a clockwise command pulse to the Y-axis.

Each X-axis and Y-axis distributor 9.10 (SN7497.6-bit frequency divider; pulse thinning circuit manufactured by Tegisas Instruments) divides the reference pulse into a number of pulses according to the feed amount of the X-axis and Y-axis. This is applied to each drive circuit 13.14 of each motor 4.5 for the X-axis and Y-axis. That is, pulse n(n
6 to 63), the reference pulse is output as an n/64 pulse.

Suppose you want to send m-pulse position command pulses to the drive circuit 12 of the sewing machine main shaft to make the sewing machine main shaft rotate once (from the time the needle pierces the fabric to the next time).
-Y feeding is assumed to feed the work cloth relative to the needle by a111m with one position command pulse. Here, if feed amount data of n=0 is given to the pulse distributor 9.10, it takes m X a X O/64 for one rotation of the sewing machine.
= If the trunk moves by 0 and the forward view data of n=1 is given, it takes mx a x 1/6 to make one rotation of the sewing machine.
Move 4 mm. Given the feed amount data of n-63, it takes m X a X 63 to make one rotation of the sewing machine.
/ Moves 64 mm.

The method of synchronizing each needle stick angle using the pulse counter 11 is as follows. That is, T shown in FIG.
By issuing the rise signal (synchronization signal) of imer Out, the XDAT, XDIR, YD
Each data of AT and YDIR is set in each distributor 9.10. When the central processing unit 6 detects the synchronization signal, it 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. By doing this, you can easily synchronize the three motors.

In this way, when the first needle is inserted, data corresponding to the feed amount on the X-axis and Y-axis is written according to the sewing shape,
By writing data (0, 0) to stop the feed at the last needle prick, the X-axis and Y-axis feeds can be synchronized with the movement of the main axis of the sewing machine.

If a straight line is to be sewn with a constant feed amount, the result will be as shown in FIG. 4.

That is, the rotational speed of the sewing machine slows up, continues sewing at a constant speed, and slows down when it stops. One stitch will sew mXaXXDAT/64mm in the X-axis direction and mXaXYDAT/64M in the Y-axis direction.

In this way, the central processing unit 6 generates the programmable oscillator 7.
Since it is only necessary to manage the operation of the main axis of the sewing machine by giving commands to the sewing machine, it is not only possible to simplify the software, but also to facilitate synchronization. In addition, since the timing for issuing each command is based on the central processing unit 6,
The delay time of each prefecture can be ignored by adjusting the gains of each drive circuit 12, 13, 14 equally.

Effects of the Invention Since this invention is configured as explained above,
This produces the effects described below.

That is, the table etc. do not pulsate even when driven at high speed. Furthermore, since it is only necessary to control the operation of the main shaft of the sewing machine by issuing commands to the programmable oscillator 7, not only the hardware and software can be simplified, but also the synchronization of each motor can be ensured. Furthermore, the delay time of each prefecture can be ignored.

[Brief explanation of the drawing]

Figure 1 is a drive system diagram of an automatic sewing device that drives a presser foot supported on an X-Y table in the X-Y direction of a stationary sewing machine;
Figure 2 is the circuit diagram, Figure 3 is a diagram showing the relationship between the phase of the needle bar and each signal, and Figure 4 is the relationship between the phase of the needle bar and the rotational speed of each motor during straight stitching with a constant 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 main shaft motor, 4--1--X-axis motor, 5-----Y-axis upper motor, 6-----Central processing unit, 7-------- Programmable oscillator, 9.
1 (1---Pulse distributor, 11---One counter, 12---Sewing machine main shaft motor drive circuit, 13---One feed X-axis top motor 194 circuit, 14-
--Feed Y-axis motor drive circuit agent Yasushi Moto Fujii, patent attorney

Claims (1)

[Claims] 1. Input X-axis and Y-axis feed amount data n(n;0
-63), which outputs reference pulses as n/64 pulses, and pulse distributors 9, 10 which issue position command pulses to the drive circuit 12 of the sewing machine main shaft
a programmable oscillator 7 that emits a reference pulse to 10;
It consists of a counter 11 that emits a synchronizing signal, and by the synchronizing signal, the X-axis and Y-axis feed amount data are set in the respective pulse distributors 9 and 10, and while the next synchronizing signal is detected, the X-axis, An automatic sewing device that outputs output to each drive circuit 13, 14 of each Y-axis feed motor 4, 5.