JPS6315993A - Control unit of 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 [Field of Industrial Application] The present invention relates to a control device for a sewing machine equipped with an emergency stop function.

[Conventional technology]

Figure 2 is an explanatory diagram showing the outline of a conventional device, which is equipped with a sewing machine thread trimming solenoid and a back solenoid, a sewing machine control device (1) with a built-in microcomputer that issues an operation stop command, and a sewing machine control device (1) that controls speed control and positioning. It consists of a built-in microcomputer for speed control (2), and an emergency stop signal (2).
Es) are for sewing machine control (1) and speed control (2), respectively.
) is applied in common. In the figure, (3) is a sewing machine, (4) is an electric motor, and (5) is a belt that connects the respective boars of the sewing machine (3) and the electric motor (4).

The conventional control device is configured as described above, and when an emergency stop signal (Es) is applied to the sewing machine control device (1), it deenergizes the solenoid (not shown) of the sewing machine (3), and
This sewing machine control unit (1) is brought into an initial stopped state by a reset signal (R1). At the same time, when the emergency stop signal (Es) is introduced for speed control (2), fS! p
HWA (41 stops immediately. Here, for sewing machine control (1), sequence control with multiple inputs and multiple outputs is required, and for machine speed control (2), high-speed processing is required. Therefore, separate microcomputers are built in for both of these controls.Furthermore, the microcomputer for the sewing machine control M section (1) includes a CMOS element with low power consumption and a large noise margin. The microcomputer for speed control (2) has an NM for high-speed processing.
OS elements are used respectively. Therefore, the threshold voltage of the pixel elements is different, or the emergency stop signal (Es
), there was a possibility of malfunction due to the pulse width.

That is, as shown in Fig. 3 (A), if the ON time of emergency stop A: (Esl) is relatively long from time (tl) to (t,), the input signal is input to sewing machine control (1). The timing (ti) of the signal (Es) (see B) and the timing (t9) of the signal (Es) input to the speed control (2)
) (see C) mesh well, and both systems (11,
(Each of the 21 microcomputers receives an emergency stop signal (Es).
) is supplied together with the emergency stop operation, and as a result, the rotation of the sewing machine shaft, the output shaft of the electric motor (4), the thread trimmer, wiper, push-up, reverse stitch solenoid, etc. for the sewing machine are turned off.

[Problems that the invention cannot solve] In the conventional device described above, when the emergency stop signal (Es) is on for a short period of time from time (t2) to time (t4) as shown in Fig. 3 (DJ), the emergency stop signal (Es) is Time (t) of the stop signal (Es)
In 3), only the signal for sewing machine control (1) effectively acts, but the signal (Es) for speed control (2) does not act, so the desired stopping operation cannot be obtained. Furthermore, if chucking occurs when the emergency stop signal (Es) is turned on and off, the effective pulse width of the emergency stop signal becomes narrower, which makes malfunctions more likely to occur.

Furthermore, each threshold voltage at the input section for sewing machine control (1) and speed control (2) is CuO2°)
Since each MO3 element is different, the resistance i1 (R
) and a capacitor (C) (this is a type of integrating circuit) is inserted on the input side, 8MO3
The threshold voltage (vth) of the element is approximately 1.5V
The threshold voltage (V t
Since h2) is approximately 2.5■, what is the ON time of the emergency stop signal (Es) at point (A) in Figure 4? As shown in FIG. Time (t,
) ~ (t4) Emergency stop signal (Es) for a short time
is on, the voltage at point (B) in FIG. 4 is slightly rounded due to the integral operation. Therefore, the emergency stop signal (Es) does not reach one of the threshold voltages (vth, ), so both control sections (1) and (2) do not operate normally. In other words, the ON time of the emergency stop signal (Es) (
There have been cases where only the sewing machine control device (1) or the speed control device (2) operates due to the pulse vA), or malfunctions may occur due to differences in threshold voltages of elements constituting the microcomputer.

This invention was made to solve the above-mentioned problems, and has a simple configuration, no abnormal operation, and an emergency stop 81.
The purpose is to obtain a device that works effectively.

[Means for solving problems]

The emergency stop signal of the control device according to the present invention is applied only for speed control, and when the emergency stop signal is input, the reset signal for speed control is applied for sewing machine control.
It's a small thing.

[Effect]

In this invention, only the speed control device receives an emergency stop signal to stop the motor, and at the same time, a reset signal is applied to the sewing machine control to return it to its initial state, thereby quickly disabling the emergency stop function in the control device. and operate without malfunction.

[Embodiments of the invention]

FIG. 1 is a schematic block diagram of a control device according to an embodiment of the present invention, and since the same reference numerals as in the conventional device of FIG. 2 are the same or corresponding parts, a description thereof will be omitted. In Figure 1, the emergency stop signal (ES) is for speed control (2
), and this output signal (2) for speed control is introduced into the sewing machine control (1) via an OR gate (6). As a result, the emergency stop signal (
Only the speed control (2) is uniquely driven by the sewing machine control (1), which is the reset signal that is the output of the OR gate (6), or the speed control (2) output signal. Therefore, malfunctions caused by the on-time width of the emergency stop signal shown in FIG. 3 and malfunctions caused by differences in threshold voltages can be completely eliminated.

〔Effect of the invention〕

As detailed above, according to the present invention, with a simple configuration,
This has the effect of effectively operating the emergency stop function without abnormal operation.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic configuration diagram of the conventional device, FIG. 3 is a waveform diagram showing its operation, FIG. 4 is an explanatory diagram of the conventional device, and FIG. 5 is a waveform diagram showing its operation. In the figure, (1) is for controlling a sewing machine equipped with a thread cutting section, (2)
is for speed control, (3) is for sewing machine, and (4) is for electric! li! I
machine, (5) is Bell I-, and (61 is Orgame I.) In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a sewing machine control device that has two microcomputers, one for sewing machine control and one for speed control, when an emergency stop occurs, an emergency stop signal is input to the speed control microcomputer, and at the same time, the speed control microcomputer resets the sewing machine control microcomputer. A sewing machine control device characterized by applying a signal.