JPH07112089A - Sewing machine device - Google Patents

Abstract

PURPOSE:To constitute the device so that a sewing machine mechanism part and a sewing object can be protected by rapidly stopping the mechanism even in the case a power source of the sewing machine is disconnected in the course of rotation at a high speed, by a simple and inexpensive constitution. CONSTITUTION:A power source disconnection detecting circuit 23 is provided in order to detect a power source supply state, and in the case the power source supply is cut off, an interruption is applied to a CPU 11 for controlling the whole mechanism by the power source disconnection detecting circuit 23. In the case this interruption is applied, an error flag is set only in the course of rotation of a sewing machine motor 13 by an interruption processing of the CPU 11, and on the other hand, in a main control processing of the CPU 11, stop control of the sewing machine motor 13 is executed immediately in accordance with this error flag. In the case a power source error is generated, its fact is stored in a nonvolatile memory, and also, an error display is executed by a display 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine, and more particularly to a sewing machine which drives a sewing mechanism by a sewing machine drive motor.

[0002]

2. Description of the Related Art Conventionally, a sewing machine has been known in which a CPU such as a microprocessor is used to control a mechanism based on sewing control data.

FIG. 1 shows the basic structure of such a sewing machine. Reference numeral 11 is a CPU including a microprocessor and the like, and drives a sewing machine motor 13 for rotating the main shaft of the sewing machine or another motor via a motor driver 12. The rotation speed of the sewing machine motor 13 is fed back to the speed detector 14, and the CPU 11 determines the control amount of the sewing machine motor 13 according to the detected amount. In addition, the CPU 11 is supplied with an output of a pedal sensor 15 for detecting a state of a pedal switch for operating the sewing machine, an output of a synchronizer 16 for synchronously controlling the operation of each part of the sewing machine, and the like.

The synchronizer 16 has a sewing machine needle position detector built in the sewing machine pulley of the sewing machine main body, and the needle up position and the needle down position are set to 1 according to the rotation of the sewing machine main shaft.
It can be detected for each rotation.

The power of the sewing machine is supplied from a power supply circuit (not shown), but the reset circuit 17 for resetting the CPU 11 and other circuits when the power is turned on is supplied from the reset circuit 17 to the CPU 11.
The reset signal 18 is input to.

[0006]

In the sewing machine device as described above, the reset signal 1 has been conventionally used even when the power is turned off.
Since 8 is input to the CPU 11, the control is stopped and the motor drive output from the CPU 11 to the motor driver 12 is stopped. Therefore, there is a problem that the lapping machine and the sewing machine move until the rotational inertial force disappears. It was

Further, conventionally, a configuration using a motor with a brake plate is known as shown in FIG. 2 in order to immediately stop the rotation of the motor when the power is turned off.

In the structure shown in FIG. 2, a brake plate solenoid 19 for driving a brake plate for stopping the sewing machine motor 13 is mounted on the sewing machine motor 13 shown in FIG. 1, and the brake plate solenoid 19 for controlling the brake plate solenoid 19 is mounted. As a drive signal for the driver 20, the reset signal 18 is also input via the OR gate 21.

In such a mechanism, since the reset signal 18 is input to the CPU 11 when the power is cut off, the control is stopped and the motor drive output is also stopped as described above, but the reset signal 18 is sent to the brake plate solenoid driver 20. Since it is also wired, the brake plate is momentarily driven and the mechanism can be stopped suddenly.

Further, in the conventional device as described above, when the power is cut off while the sewing machine is rotating, a reset signal is input to the CPU, and the motor output port of the CPU becomes high impedance. Although all phases are turned off and deceleration starts, immediately after that, when the power is restored, initial operations such as needle up position stop operation are started.

Such a phenomenon often occurs in areas where power supply equipment is defective or power supply conditions are poor, but a worker can easily misunderstand it as a malfunction of the sewing machine and sometimes make a complaint.

Further, in the case of a motor without a brake plate, since the motor cannot be stopped immediately as described above, there is a problem that the sewing product is spoiled and the sewn product is spoiled.

Particularly, in the case of a cycle sewing machine in which the same sewing pattern can be repeatedly executed by using the cloth feed cam corresponding to the sewing pattern, the automatic thread trimming mechanism or the like operates in the final stroke of one cycle. Therefore, the final needle needs to be sufficiently decelerated, but if it is not decelerated, uncomfortable sound of the mechanism operating at high speed and risk of damage may occur.

A sewing machine using a motor with a brake plate eliminates the problem in this case, but has a problem that it becomes an expensive system.

The object of the present invention is to solve the above-mentioned problems, and by a simple and inexpensive structure, even if the power of the sewing machine is cut off during high-speed rotation, the mechanism can be stopped suddenly to protect the sewing machine mechanism portion and the sewing material. To provide a simple sewing machine.

[0016]

In order to solve the above problems, in the present invention, in a sewing machine device for driving a sewing mechanism by a sewing machine drive motor, a control means for controlling the operation of the sewing machine drive motor and the entire mechanism. And monitoring the state of the power supply for driving the device, and when detecting that the power supply is cut off, it has a power supply monitoring means for interrupting the control means by a detection signal, and the control means is provided with the power supply monitoring means. When the interruption due to the detection signal indicating the interruption of the power supply is applied, the control means immediately performs the stop control for the sewing machine drive motor.

[0017]

According to the above construction, when the power supply state is monitored and it is detected that the power supply is cut off, the control means for controlling the operation of the sewing machine drive motor and the entire mechanism immediately notifies the sewing machine drive motor. Stop control can be performed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 3 is a perspective view showing the external appearance of the sewing machine controlled by the motor. In FIG. 3, the sewing machine 1 is an operation console 2
The sewing machine main body 3 is mounted on top of the machine. A motor 13 and a sewing machine controller (motor / sewing machine controller) 5 are arranged below the operation console 2. Sewing machine body 3
Is a cycle sewing machine capable of repeatedly executing the same sewing pattern by using a cloth feed cam corresponding to the sewing pattern,
It is activated by depressing the pedal 6 connected to the sewing machine control device 5.

FIG. 4 is a control block diagram showing the sewing machine controller 5. As shown in FIG. 4, the sewing machine control device 5 has substantially the same basic configuration as the conventional device, but here, an error display means 22 and a power cut detection circuit 23 are added.

Although not shown in FIG. 4, a read only memory (ROM) and a random access memory (RA
M), non-volatile read only memory (EEPROM),
An input / output device (I / O) and the like are provided, and a CPU to be described later
The control program 11 is stored in the ROM (not shown).

The display 22 is composed of an LCD panel or the like and is used to display an error described later. The power-off detection circuit 23 is a circuit that detects disconnection of the main power source, for example, a circuit that monitors AC input to the power source circuit,
The disconnection detection signal is output immediately when the power is turned off. This disconnection detection signal is detected by the interrupt control of the CPU 11,
The control described later is performed according to the detection state.

The power supply circuit (not shown) uses the power stored in the condenser provided in the smoothing circuit or the like to calculate
The motor 13 and the illustrated control circuit can be driven for 00 ms.

FIG. 5 is a flow chart showing the overall control of the CPU 11. When the power is turned on, the system is initialized by the initial routine (step S1).

In the sequence control routine (step S2), it is checked whether or not the pedal is depressed by the pedal sensor 15, and if the pedal 6 is depressed and the pedal sensor 15 is on, the sewing machine is started. In order to do so, the motor control routine (step S3) is started, the rotation command and the instruction speed are given, and the rotation of the sewing machine motor 13 is controlled via the motor driver 12.

Motor control routine (step S
In 3), when the rotation command is presented, the command is discriminated, and the motor driver 12 is controlled to match the motor speed detected by the motor speed detector 14 attached to the rotation shaft of the motor 13 with the command speed. A drive command signal is given to rotate the motor 13.

When the motor 13 rotates, the main shaft of the sewing machine body also rotates via a drive mechanism such as a belt. If it is rotating normally, an error check routine (step S
Step 4) immediately exits and returns to the sequence control routine (step S2).

Here, after the sewing machine is started, the sewing machine needle position detector of the synchronizer built in the sewing machine pulley of the sewing machine main body detects the needle up position and the needle down position for each rotation according to the rotation of the sewing machine main shaft. Since this is possible, the loop of repeating the error check while continuously issuing the rotation command to the motor control routine (step S3) while counting the number of stitches is repeated. When the counted number of stitches reaches the specified number of stitches, a brake command is issued to the motor control routine to stop the sewing machine.

The above is one cycle process of the cycle sewing machine.

On the other hand, the power-off detection circuit 23 is a circuit for monitoring the AC input in the power circuit, and immediately outputs a detection signal when the power is off.

After that, the motor 13 and the control circuit of FIG. 4 can be driven for several 100 ms by the electric power stored in the power supply circuit capacitor (not shown), but after this time, the control circuit is driven. The voltage drops below a specified value (for example, 5V), the reset circuit is activated, and control is stopped.

The power-off detection signal of the power-off detection circuit 23 functions as an interrupt signal to the CPU 11. After power-off, the period shown in FIG. 6 can be used during the period when the motor 13 can be driven and the control circuit of FIG. 4 can operate. The built-in routine is started.

In the interrupt routine of FIG. 6, first, step S
At 5, the output of the motor speed detector 14 is detected. If the power is cut off while the motor is rotating after starting the sewing machine, the motor speed measured by the motor speed detector 14 does not become 0. Therefore, in step S6 the power cut detection error flag is set and the interrupt routine is exited. Return to the main routine of FIG.

The interrupt routine operates even when the power is cut off when the motor is stopped and not in the cycle operation. However, at this time, the motor speed becomes 0, so that the process proceeds from step S5 to step S7. Then, it is determined that the power supply is normally cut off, all outputs to the motor are stopped, the power supply cutoff detection signal is directly monitored again in step S8, and a reset signal is output as it is to wait until the control is stopped. When the power is restored here, the initialization process and the subsequent steps in FIG. 5 are executed.

On the other hand, in the error check routine of FIG. 5, the power cut detection error flag is inspected by the processing shown in FIG. 7, and error control is performed according to the state.

In step S9 of FIG. 7, if the power cut detection error flag is set, a brake command is issued to the motor control routine (step S9).
10) Wait until the motor speed becomes 0 (step S1)
1, S12).

When the motor speed becomes 0, it is recorded that there is an error in the nonvolatile read only memory (not shown) (step S13). Then, the error display means 22 continues to display that the power has been cut off (step S14).

Here, the error display is continued even if the power is immediately restored before the reset signal is issued by only the power interruption.

According to the above embodiment, the state of the main power supply is changed to CP.
Since the U11 constantly monitors and performs appropriate processing according to the state of the main power source, even if the power source of the sewing machine during high-speed rotation is interrupted or cut off, the mechanism is reliably stopped and the sewing machine is stopped. A system capable of protecting the mechanical section and the sewn product can be constructed at low cost.

Further, according to the above embodiment, when the power source of the sewing machine during high speed rotation is momentarily cut off, the sewing machine does not operate normally,
The mechanism temporarily stops, but since it detects an abnormality in the power supply and displays that fact, it is possible to inform the operator that this suspension is not due to a malfunction of the sewing machine but due to the power supply equipment. It will be possible.

Further, the above construction can be implemented easily and inexpensively without the need for a brake mechanism, etc. Further, if the mechanism is not rotating, the stop control of the mechanism is not carried out, and a power-off error display or storage means is provided. It does not confuse the user because it does not remember.

Furthermore, if there is a power-off error,
Since this is stored in the nonvolatile read-only memory, by checking this state, it is possible to identify whether it is a failure or a power-off error, which can be useful for maintenance. In order to easily identify the state of the flag indicating the power-off error stored in the nonvolatile read-only memory, the state of this flag may be displayed at an appropriate timing such as when the power is turned on.

[0043]

As is apparent from the above, according to the present invention, the control means for monitoring the state of the power supply and controlling the operation of the sewing machine drive motor and the entire mechanism when it is detected that the power supply is cut off. To stop control the sewing machine drive motor immediately,
Even when the power of the sewing machine is cut off during high-speed rotation, the mechanism can be suddenly stopped to protect the sewing machine mechanism and the sewing material.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a conventional sewing machine.

FIG. 2 is a block diagram showing a configuration of a conventional sewing machine with a brake plate.

FIG. 3 is an overall perspective view of a sewing machine adopting the present invention.

4 is a block diagram showing a control system of the apparatus of FIG.

5 is a flowchart showing a main control procedure of the apparatus of FIG.

FIG. 6 is a flowchart showing a power-off detection interrupt procedure of the device shown in FIG.

7 is a flowchart showing an error processing procedure of the apparatus of FIG.

[Explanation of symbols]

 2 Operation console 3 Sewing machine body 4 Motor 5 Sewing machine control device 6 Pedal 11 CPU 12 Motor driver 13 Sewing machine motor 14 Speed detector 15 Pedal sensor 16 Synchronizer 18 Reset signal 19 Brake plate solenoid 20 Brake plate solenoid driver 21 OR gate 23 Power cut detection circuit

Claims (3)

[Claims] 1. A sewing machine device for driving a sewing mechanism by a sewing machine drive motor, wherein the control means for controlling the operation of the sewing machine drive motor and the state of a power supply for driving the sewing machine device are monitored, and the power supply is cut off. A sewing machine device having a power supply monitoring means for detecting the occurrence of a power failure, and when the monitoring means detects a detection signal indicating a power supply interruption, the control means immediately performs stop control for the sewing machine drive motor. . 2. When the detection signal is generated by the power supply monitoring means, the fact is displayed as a power supply disconnection error,
Alternatively, it is stored in a storage means.
The sewing machine described in 1. 3. Only when the detection signal is generated while the sewing machine is being driven, the stop control and the power-off error are displayed or stored in the storage means, and when the detection signal is generated while the sewing machine is stopped, A sewing machine device which is characterized in that the power-off error is not displayed or stored in a storage means.