JPS596095A - Electronic control sewing machine - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronically controlled sewing machine that can generate individual sewing patterns at a stable speed.

Sewing machines that use servo motors, pulse motors, etc. to control needle amplitude and fabric feed have limits to the stable followability of the servo mechanism and the pulse repetition rate. It is necessary to limit the maximum speed for each pattern, but in the past, the person using the sewing machine had to adjust the speed for each pattern selected.

In order to eliminate this drawback, information related to a plurality of self-sewn patterns is stored in a series of address locations in a static storage device, and the first stitch specified before the address for reading out the first stitch of this self-sewn pattern is stored in a series of address locations in a static storage device. When information for limiting the maximum speed of the pattern is set in the address and information related to each sewing pattern is read out, the speed command detection device detects the speed limit information and uses this speed limit information as the speed limit. An electronically controlled sewing machine is known that is held in an information storage device and outputs speed limit information every time a pattern is repeated, so as to drive the sewing machine at a speed within a range that does not cause pattern distortion. (See Publication No. 7758).

However, in conventional electronically controlled sewing machines configured in this way, information on the sewing pattern and speed limit information are mixed, so a speed command detection device and a speed limit information holding device are required, making the configuration complicated. There were drawbacks.

In order to eliminate the drawbacks of the above-mentioned conventional example, the present invention separates the button amplitude and cloth feed information corresponding to the sewing pattern,
It is characterized by being stored in a static storage device, and its purpose is that it does not require a speed command detection device or a speed limit information holding device unlike the conventional example, so the configuration is simple, and moreover, it is possible to sew only one stitch. An object of the present invention is to provide an electronically controlled sewing machine that prevents pattern misalignment.Examples will be described in detail below with reference to the drawings.

FIG. 1 shows a block diagram of an embodiment of the present invention, in which 1 is a central processing unit, 2 is a read-only memory, 3 is a read/write memory, 4 is a timer, 5 is a zero-cross signal generator, 6 1 is an input/output device, 7 is a cloth feed pulse motor drive circuit, 8 is a cloth speed linoculus motor, 9 is a zigzag pulse motor drive circuit, 10 is a zigzag pulse motor, 11 is a timing detection device, 12 is a pattern and speed selection display device , 13 is a motor control circuit, 14 is a sewing machine driving motor,
15 is a pattern selection circuit, 16 is a speed selection circuit, 17 is a start/stop circuit, and the zero cross signal generator 5 generates a 0 voltage signal of the commercial AC power supply applied to the motor control circuit 13. Interrupt the central processing unit 1 with a voltage signal. Further, the signal output from the input/output device 6 is inputted to a cloth feed pulse motor drive circuit 7 and a zigzag pulse motor drive circuit 9, which drive the cloth feed pulse motor 8 and zigzag pulse motor 10, respectively, to adjust the needle amplitude and A self-sewn pattern is formed by controlling the amount of cloth feed.Furthermore, the timing detection device 11 generates a signal every time the sewing machine rotates at a predetermined rotational phase of the sewing machine.

As shown in FIG. 2, the pattern and speed selection display device 12 uses light emitting diodes.
In the first speed, one light emitting diode is lit, in the second speed, two light emitting diodes are used, and in the third and fourth speeds, three and four light emitting diodes are lit respectively, and the selected light emitting diode is lit. Display speed. In addition, the setting value of the rotational speed of the sewing machine when the first speed is selected is N 2 (rpm), the speed data at that time is 2, and the second speed and third speed are set.
The setting values for the rotational speed of the sewing machine when speed and 4th speed are respectively selected are N4 (ROM), N6 (rpm), and pJ.
8 (rpm>), and each speed data at that time is set to 4.6.8.

Furthermore, the speed selection display (1st speed to 4th speed) shown in Figure 2
The relationship between this and the sewing machine rotational speeds N1 to N8 is as follows, as shown in FIG. 3: Nl<N2<...<N8.

Next, the speed limit data and the leading data of the sewing pattern in the electronically controlled sewing machine of this embodiment are stored in the read-only memory 2.
We will explain how to store it in In the read-only memory 2 of this embodiment, as shown in Table 1 below, needle amplitude start data and cloth feed start data are stored for each pattern.
Next, the maximum speed, Table 2 below shows the maximum speed data M
(speed limit information) and the rotational speed of the sewing machine, maximum speed data M7! For example, if Ii is "5", the maximum speed of the sewing machine is limited to N5 or less. That is, in FIG.
If speed is selected, the sewing machine speed will be set to 1st or 2nd speed.
However, even if the third or fourth speed is selected, the rotational speed of the sewing machine will not become faster than N5.

The operation of this embodiment configured as described above is shown in FIGS. 4 and 5.
This will be explained using the 70-chart in the figure. First, in FIG. 4, when a pattern P is selected in the pattern selection circuit 15, the maximum speed data of that pattern P is set in the max speed register, and as shown in Table 1, the maximum speed data of that pattern P is set in the max speed register, and as shown in Table 1, The needle amplitude data start address and cloth feed data start address are set in respective address registers.

Next, referring to the data indicated by the address register, it is determined whether a predetermined number of stitches has been completed, that is, whether the selected pattern has completed one cycle, and if so, the needle amplitude and Set the cloth feed data start address in the address register. Note that if one cycle of the pattern has not been completed, "1" is added to the address register, the signal from the timing detection device 11 is checked,
Data indicated by the address register is applied to the zigzag pulse motor drive circuit 9 and the cloth feed pulse motor drive circuit 7 in accordance with the needle amplitude and cloth feed timing.

In addition, the speed selection circuit 16 is set from the first speed to the fourth speed in FIG.
When one of the speeds is selected, the corresponding speed information is compared with the value in the max speed register, and if the value in the max speed register is smaller than the selected speed information, the contents of the max speed register are stored in the speed select register. transfer. Further, if the selected speed information is smaller than the value of the max speed register, the selected speed information is set in the speed select register.

Furthermore, when the starsis stop switch is turned on and a start signal for the sewing machine is received from the start/stop circuit 17, the speed counter register is cleared to φ and interrupts are permitted, and when a stop signal is received from the start/stop circuit 17, Disable interrupts.

FIG. 5 shows a flowchart explaining the interrupt program. When a start signal is input from the start/stop circuit 17, an interrupt becomes possible, and the interrupt is activated by a signal from the zero-cross signal generator 5h). . When this interrupt occurs, control is immediately transferred from the program shown in FIG. 4 to the program shown in FIG. 5.

In addition, in FIG. 5, if the interrupt is not from the timer 4 but from the zero cross signal generator 5, it is determined whether it is time to change the speed of the sewing machine based on the signal from the timing detection device 11, and the speed can be changed. If the timing is right, compare the contents of the speed counter register and the speed select register,
If the value of the speed select register is much lighter than the value of the speed counter register, add 1 to the contents of the speed counter register, and if the value of the speed select register is the same or smaller, transfer the contents of the speed select register to the speed counter register. do. The time 1 from the zero cross signal to the application of the pulse to the motor control circuit 13 is calculated based on the value of this speed counter register.

This time interval is limited to 0<L<T in order to smoothly drive the sewing machine driving electric motor 14. However, as shown in FIG. 6, T indicates the half cycle time of the commercial AC power supply.

The data calculated in this way is
(see figure), and when the timer 4 is started, the data is subtracted by one at regular intervals, and when φ is reached, an interrupt is issued to the central processing unit 1. Moreover, when timer 4 is started, the program returns to the 1P+4 diagram. Next, if the interrupt is from the timer 4, the process returns after the pulse is applied to the motor control circuit 13. At this time, when the pulse is applied to the motor control circuit 13, the thyristor of the motor control circuit 13 is turned on, and power is supplied to the electric fi 14 for driving the sewing machine.

In this way, the data of timer 4 is calculated based on the data of the speed select register, so if the sewing machine speed is selected and the contents of the max speed register are smaller than the selected speed data,
Since the contents of the speed select register are input to the max speed register, the speed of the sewing machine will never be higher than the maximum speed for each pattern. Also, the speed counter register is cleared to φ at the start, and if the value of the speed counter register is smaller than the value of the speed select register in the interrupt program shown in Figure 5,
Furthermore, since "1" is added to the speed counter register, the speed of the sewing machine gradually increases, which has the advantage of slow start and easy operation.

As explained above, according to the present invention, speed limit information is stored in a static storage device (read-only memory) separately from needle amplitude information and cloth feed information. Since the speed command detection device and speed limit information holding device for selecting the speed limit information from the pattern information used in the conventional example can be omitted, the configuration is simplified.
There are also advantages in that reliability is increased and costs are reduced.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an electronically controlled sewing machine according to an embodiment of the present invention, Fig. 2 is a diagram showing the relationship between the speed selection display, the sewing machine rotational speed and speed data, and Fig. 3 is a diagram showing the relationship between the selected speed and the sewing machine rotation speed. The diagrams 4 and 5 showing the relationship with rotation speed are as follows:
70-chart for explaining the operation of the device of FIG. 1;
FIG. 6 is a waveform diagram of the commercial AC power supply, the zero-cross signal, and the signals applied to the motor control circuit. 1...Central processing unit, 2...Read-only memory,
3...Read/write memory, 4...Timer, 5...
Zero cross signal generator, 6... Input/output device, 7...
- Cloth feed pulse motor drive circuit, 8... Cloth feed pulse motor, 9... Zigzag pulse motor drive circuit, 10
. . . Zigzag pulse motor, 11. Timing detection device, 12. Pattern and speed selection display device, 13.
Machine, 15-- Pattern selection circuit, 16- Speed selection circuit, 17- Start/stop circuit. Patent Applicant: Happy Sewing Machine Manufacturing Co., Ltd. Figure 5 Figure 6 Figure Proceedings Amendment Act October 21, 1981 Director of the Patent Office Kazuo Wakasugi 1, Indication of Case 1982 Patent Application No. 113599 2, Invention Name of Electronically Controlled Sewing Machine 3, Relationship to the Amendment Case Patent Applicant Address 5-9-16 Miyamachi, Yamagata City, Yamagata Prefecture Name (
Name) Happy Sewing Machine Manufacturing Co., Ltd. Representative Hara 1
) Takashi - 4. Address of agent: 4-13-10, Ichiyo Ichikokubu, Chiba Prefecture (Date of dispatch: September 28, 1980) 6. Number of inventions increased by amendment 07. Application subject to amendment, power of attorney and Specification 8, contents of amendment as per attached sheet 505

Claims (2)

[Claims] (1) Store needle amplitude information and cloth feed information related to each stitch that constitutes multiple self-sewn patterns in a series of address positions, and also store information on the first sewing date of the multiple self-sewn patterns in 1. a static storage device storing maximum speed information for determining the maximum speed of the sewing machine drive motor, and one of the plurality of self-sew patterns at an address next to the needle amplitude information start address and the cloth feed information start address a pattern selection circuit for selecting a sewing machine; a speed selection circuit for setting the speed of the electric motor for driving the sewing machine; a timing detection device for generating a signal every time the main shaft rotates; A zigzag pulse motor drive circuit that drives a zigzag pulse motor based on corresponding needle amplitude information, and a fabric feed pulse motor that drives a fabric feed pulse motor based on fabric feed information that corresponds to the sewing pattern selected by the pattern selection circuit. It consists of a drive circuit, a start/stop circuit that starts the sewing pattern selected by the pattern selection circuit, and a central processing unit that calculates or controls input and output in each of the circuits. When the own pattern is selected, the maximum speed information is set in the max speed register, the needle amplitude start address and cloth feed start address corresponding to the sewing own pattern are set in the respective address registers, and the information is read from the timing detection device. The electronically controlled sewing machine is characterized in that the information indicated by the address register is applied to the zigzag pulse motor drive circuit and the cloth feed pulse motor drive circuit according to the needle amplitude information and cloth feed information. . (2) If the speed information set by the speed selection circuit is smaller than the maximum speed information set in the max speed register, the speed information set by the speed selection circuit is set in the speed select register, and the speed information 2. The electronically controlled sewing machine according to claim 1, wherein when the maximum speed information is larger than the maximum speed information, the maximum speed information of the max speed register is transferred to the speed select register.