JPH0612982U - Control circuit of motor for opening / closing mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] Detects fluctuations in the motor supply voltage and turns off the power to prevent motor overload. A control circuit of an opening / closing mechanism motor of a mechanical watch for controlling the operation of a motor for driving an opening / closing member of an opening / closing part of the mechanical watch, which is arranged in a supply circuit of the motor, and a motor supply voltage of the circuit is A control circuit for an opening / closing mechanism motor of a mechanical watch, which is provided with a reference voltage comparison circuit for outputting a motor drive stop signal to the control circuit when it fluctuates from a normal reference voltage.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a control circuit for an opening / closing mechanism motor for a mechanical timepiece that drives the opening / closing portion of the mechanical timepiece to open and close, and particularly to prevent overload of the motor.

[0002]

[Prior art]

 Conventionally, as a mechanical watch, an opening / closing part such as a lid and a door provided in the watch main body, a mechanical mechanism main body provided in the opening / closing part, a motor mechanism for opening / closing the opening / closing part, and a drive for this motor It is known that a power supply unit such as a battery that supplies a current and a control unit that controls the drive current are provided. Then, such a color-adjusting clock starts the color-changing operation at the hour or by the color-changing operation start switch.

That is, first, the control unit rotates the motor in the forward direction to drive the opening / closing unit, and, for example, an opening operation of the opening / closing unit such as opening a door is executed, and a preparatory operation for the color-clearing operation is performed. Next, the main operation of activating the mechanical mechanism provided in the opening / closing section and sounding the music box is performed for a predetermined time. Then, after the completion of the main operation, the control unit reversely rotates the motor to reversely operate the opening / closing unit to perform a closing operation such as closing the door, and the end operation of the mechanical operation is performed. In other words, a single motor is used to drive the opening / closing section, and the motor is rotated forward / reversely to open / close the opening / closing section.

Further, the opening / closing section is configured such that an opening / closing body such as a door or a lid is attached to an opening provided in the timepiece body so as to be openable / closable, and the opening / closing body is attached to the motor mechanism. It is connected via a reduction gear and a link mechanism. The opening / closing member is configured to open / close by a motor mechanism, for example, by reciprocating within a certain range or increasing / decreasing the opening angle.

Further, sensor switches including contact switches and the like are provided at the start and end ends of the operating range of the opening / closing body, and the switches are connected to the control section by cord wiring. Therefore, during the opening / closing operation, the opening / closing body is moved to a predetermined position, comes into contact with the sensor switch, and is turned on. The switch-on operation determines that the opening / closing section has completed the opening or closing operation, and the control section turns off the supply current to the opening / closing mechanism motor to stop the driving of the motor.

[0006]

[Problems to be solved by the device]

 However, according to the above-mentioned conventional technique, the motor drive current cannot be turned off when the opening / closing body such as the door cannot move to the position where the sensor switch is provided due to an obstacle in the middle of the opening / closing operation. Since the current continues to flow through the motor, there was a problem that the battery power supply such as the battery was over-discharged and the power supply circuit was adversely affected.

Further, in this case, since the rotational torque load of the motor is larger than that during normal operation, excess current will flow to the motor, which may cause the motor to overload and fail. .

Therefore, an object of the present invention is to provide a control circuit for an opening / closing mechanism motor of a mechanical watch that detects a fluctuation in a motor supply voltage and turns off the power to prevent a motor overload.

[0009]

[Means for Solving the Problems]

 The present invention is a control circuit for an opening / closing mechanism motor for a mechanical watch that controls the operation of a motor that opens and closes the opening / closing body of the mechanical watch, which is disposed in the supply circuit of the motor and supplies the motor of the circuit. When the voltage fluctuates from the normal reference voltage, the control circuit has a reference voltage comparison circuit that outputs a motor drive stop signal.

[0010]

[Action]

 Therefore, according to the present invention, since the end of the predetermined opening and closing operations of the opening / closing part is determined by the fluctuation of the voltage supplied to the motor, the opening / closing part of the opening / closing part completes the predetermined operation and stops. In addition to the above, the motor load increases and the supply voltage increases even if the opening / closing body stops while contacting an obstacle during the operation and cannot complete the specified operation. You can stop.

[0011]

【Example】

 The present invention will be described below based on the embodiment shown in FIG. As shown in FIG. 1, the control circuit 10 for the opening / closing mechanism motor of the automatic watch according to the present embodiment includes a power supply unit 11, a DC motor 12, a single power supply type motor forward / reverse rotation circuit 13, and this forward / reverse rotation circuit. 13 is composed of a control unit 14 for controlling the operation of the control unit 13 and a reference voltage comparison circuit 15 for outputting a signal for turning off the motor to the control unit 14. The control unit 14 is connected to an operation circuit of the main body of the mechanical operation mechanism such as a music box playing function (not shown).

That is, in this circuit, the current from the single motor power supply unit 11 is passed through the motor forward / reverse circuit 13 including switching transistors (hereinafter, referred to as SW transistors) 16, 17, 18, 19. It is supplied to the DC motor 12 (DC motor), and the switching operation of the SW transistors 16, 17, 18 and 19 of the forward / reverse rotation circuit 13 switches the direction of the supply voltage to the motor 12 to the forward / reverse direction. It rotates forward and backward. Further, the reference voltage comparison circuit 15 arranged in the earth side electric circuit of the forward / reverse rotation circuit 13 prevents the motor load from increasing and the voltage of the electric circuit to increase when a predetermined operation is completed by driving the motor. It detects and stops the motor drive. Therefore, in either the normal or reverse rotation of the motor, when the operation is completed, the voltage of the electric path increases, so that the motor can be turned off.

The motor 12 is connected to an opening / closing body of an opening / closing unit provided in the mechanical timepiece through a deceleration mechanism, a link mechanism, etc., which are not shown. Therefore, by rotating the motor 12 in the normal and reverse directions, the opening / closing member can be driven in the normal and reverse directions to open / close the opening / closing section.

The forward / reverse rotation circuit 13 is composed of a pair of SW transistors 16 and 18 for supplying a motor forward rotation driving current and a pair of SW transistors 17 and 19 for supplying a motor backward rotation driving current. It is configured. That is, the collector side of the SW transistors 16 and 17 is connected to the power supply section 11 side, while the emitter side is connected to the motor 12 terminal, respectively. The collector side of the SW transistors 18 and 19 is connected to the motor 12 terminal, while the emitter side is connected to the ground side. Further, the base sides of these SW transistors 16, 17, 18, 19 are connected to the control unit 14 by individual wiring lines a, b, c, d. Therefore, by selecting these wirings a, b, c, d from the control unit 14 and supplying the base current, the switch-on operation of the SW transistors 16, 17, 18, 19 is selectively switched. Thus, the driving current can be supplied to the motor 12 from the forward and reverse directions. That is, the switching operation of the forward / reverse rotation circuit 13 switches the direction of the voltage applied to the motor 12 to the forward / reverse directions, thereby rotating the DC motor 12 in the forward / reverse direction.

The reference voltage comparison circuit 15 is composed of an operational amplifier 20 used as a comparator (voltage comparator) and resistors 21, 22, 23 for setting an input voltage to each input terminal of the operational amplifier 20. ing. That is, the operational amplifier 20 has an inverting input terminal connected to the ground-side supply circuit from the forward / reverse circuit 13 and an output terminal connected to the control unit 14. The resistor 21 provided on the electric path is provided to adjust the input voltage to the non-inverting input terminal of the operational amplifier 20. That is, the voltage flowing through the electric path during the normal operation of the motor is set to a resistance value that allows the input reference voltage of an appropriate magnitude to be obtained when operating as the comparator of the operational amplifier 20. Further, since the non-inverting input terminal of the operational amplifier 20 has a very high input resistance and almost no input bias current flows, it is possible to set the resistances of the resistors 22 and 23 to be equal in size according to the reference voltage. It is possible to obtain the non-inverting input side voltage of. That is, the voltage of the separate power supply 24 is divided so that an appropriate input voltage of the inverting input terminal of the operational amplifier 20 is obtained from the separate power supply 24. Therefore, if the motor supply voltage of the electric circuit fluctuates even a little, the operational amplifier 20 outputs a voltage for turning off the motor drive to the control unit 14. Reference numeral 25 is a single power supply unit that supplies an operating current of the operational amplifier 20.

The control unit 14 has a clocking function and can supply a base current to each of the SW transistors 16, 17, 18, and 19 via the wirings a, b, c, and d. That is, the SW transistors 16 and 18 supply a base current for switching on at a predetermined set time such as the hour, and an OFF operation signal from the reference voltage comparison circuit 15 lowers the base current to a constant value. After outputting a signal for operating other color mechanism such as sounding the music box for a period of time, a base current is supplied to the SW transistors 17 and 19, and finally, an OFF operation signal from the reference voltage comparison circuit 15 causes a re-operation. And the base current is reduced.

Next, the operation of the control circuit for the opening / closing mechanism motor of the automatic timepiece will be described. In other words, the hour of the hour or the turn-on of the start-up switch of the color-shift operation starts the color-shift operation of the color-shift clock.

First, a base current is output to a and d from the control unit 14 to which the color start signal is input, and the SW transistors 16 and 18 are turned on. As a result, as indicated by the solid line arrow in FIG. 1, the drive current is supplied from the power supply unit 11 to the motor 12 in one direction, and the motor 12 rotates in the forward direction. Then, the opening / closing body of the opening / closing section is driven in the forward direction by the rotational driving force of the motor 12, and the opening / closing section starts to open. When the opening / closing body moves to a predetermined position and comes into contact with a stopper or the like to stop, the load on the motor 12 increases and the motor current consumption increases. For this reason, the voltage of the electric path increases, so that the operational amplifier 20 outputs an off signal to the control unit 14. Based on this off signal, the base supply current from the control unit 14 is reduced, the SW transistors 16 and 18 are turned off, the motor supply current from the power supply unit 11 is cut, and the motor drive is stopped.

Next, the control section 14 performs a main operation such as activating a mechanism mechanism provided in the opening / closing section or sounding a music box for a preset time.

After the completion of this main operation, the controller 14 supplies and outputs an operation current for rotating the motor 12 in the reverse direction. That is, the base current is supplied from the control unit 14 to b and d, the SW transistors 17 and 19 are turned on, and as shown by the broken line arrow in FIG. The drive current is supplied to the motor 12 from the opposite direction, and the motor 12 rotates in the reverse direction. Then, the reverse rotation driving force of the motor 12 causes the opening / closing body of the opening / closing section to reversely operate, and the opening / closing section is closed. When the opening / closing body moves to the closed position and stops, a load is applied to the motor 12 and the motor current consumption increases. Therefore, the motor-off signal is output from the operational amplifier 20 to the control unit 14. Based on this off signal, the base supply current from the control unit 14 is reduced, the SW transistors 17 and 19 are turned off, the motor supply current is cut, and the reverse rotation drive of the motor 12 is stopped.

Therefore, the completion of the predetermined opening / closing operation of the opening / closing unit is determined by the fluctuation of the voltage supplied to the motor. Therefore, when the opening / closing body of the opening / closing unit completes the predetermined operation and stops, and If the motor stops due to contact with an obstruction during operation, and the operation stops before completing the predetermined operation, the motor load increases and the supply voltage increases.Therefore, the circuit of the present invention can turn off the motor. The power circuit can be protected and the motor can be prevented from being overloaded, improving safety.

Further, since the sensor switch is not required, it is possible to save the labor for selecting the installation location of the switch, the code wiring between the switch and the internal control circuit, and the cost reduction by reducing the number of assembly processes and the number of parts. At the same time, it is possible to avoid malfunctions due to this mechanical switch, and improve the reliability and reliability of the operation.

Further, instead of the sensor switch, a stopper is simply provided at a predetermined position within the operating range of the opening / closing body, so that the appearance of the timepiece body is not spoiled and the value as a product is increased.

[0024]

[Effect of device]

 As described above, according to the control circuit of the motor of the opening / closing mechanism of the mechanical watch of the present invention, the end of the predetermined opening and closing operations of the opening / closing part is determined by the fluctuation of the voltage supplied to the motor. The motor load increases when the open / close part of the unit stops after completing the specified operation, or when the open / close part comes into contact with an obstruction during operation and cannot complete the specified operation. Since the supply voltage increases, the motor can be turned off, the power supply circuit can be protected, overload of the motor can be prevented, and safety is improved.

[Brief description of drawings]

FIG. 1 is a schematic circuit diagram of a control circuit of an opening / closing mechanism motor according to an embodiment of the present invention.

[Explanation of symbols]

 10 Control Mechanism for Opening / Closing Mechanism of Motor Clock 11 Motor Power Supply Section 12 Motor 13 Motor Forward / Reverse Circuit 14 Control Section 15 Reference Voltage Comparison Circuit 20 Operational Amplifier

Claims (1)

[Scope of utility model registration request] 1. A control circuit of an opening / closing mechanism motor of a mechanical watch for controlling the operation of a motor for driving an opening / closing body of an opening / closing part of the mechanical watch, the motor control circuit being provided in a supply circuit of the motor and supplying the motor of the circuit. A control circuit for an opening / closing mechanism motor for a mechanical timepiece, comprising a reference voltage comparison circuit for outputting a motor drive stop signal to the control circuit when the voltage fluctuates from a normal reference voltage.