JPH03286288A - Controller for automatic dispenser motor - Google Patents

Abstract

PURPOSE:To repeatedly execute the intermittent operation of a motor even if there is a backlash in a mechanical system by permitting a switch to turn off conduction to the motor after prescribed delay time from when it detects the stop position of a cam. CONSTITUTION:When a control part 5 detects a discharge signal S, conduction to the motor 3 is started. When the cam switch 7 detects the protruding part of the cam 6, the control part 5 operates a delay part 10. When the delay part 10 detects that the set delay time elapses, conduction to the motor 3 is immediately terminated and a driven shaft 2 is intermittently driven by a prescribed angle. Since the cam switch 7 considerably runs onto the protruding part 9 of the cam 6 and it terminates conduction to the motor with such constitution, the motor stops in the state where the stop position is securely maintained even if there is the backlash in the mechanical system and the driven shaft 2 is reversed. Consequently, normal intermittent driving can repeatedly be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device used to control a drive motor of a product dispensing device of a vending machine or the like.

BACKGROUND ART As shown in FIG. 2, a driven shaft 2 of a product dispensing device 1 is connected to an output shaft 4 of a motor 3, and when a control section 5 detects a dispensing instruction signal S, it starts energizing the motor 3. . When the cam switch 7 detects the protrusion of the cam 6 attached to the driven shaft 2, the control unit 5 reads this and immediately stops energizing the motor 3, and rotates the driven shaft 2 intermittently at a predetermined angle. It's driving.

Specifically, the end time of energizing the motor 3 is determined as follows. During the energization period, the cam switch 7 is detecting the outer circumference 8 of the cam 6 as shown in FIG. 3(a), and the cam 6 rotates in the direction of arrow When the switch 7 detects the protrusion 9 protruding from the outer circumference 8, the control unit 5 has terminated the energization.

Problems to be Solved by the Invention In such a conventional configuration, when the power supply to the motor 3 is terminated in the state shown in FIG. As shown in Fig. 3 (C), the cam switch 7 is rotated in the direction of arrow Y, and the cam switch 7 is
It stops at a position immediately in front of the protrusion 9. In such a case, immediately after the control unit 5 detects the payout instruction signal S and starts energizing the motor 3, the state shown in FIG. Before the driven shaft 2 is rotated by the required angle, the control section 5 ends supplying four currents to the motor 3, resulting in defective product dispensing.

An object of the present invention is to provide a control device for a vending machine motor that can repeatedly realize intermittent operation of the motor even when there is backlash in the mechanical system.

Means for Solving the Problems A motor control device of the present invention is configured such that a switch detects the shape of a cam attached to a rotational drive system of the motor to stop the motor, and the switch detects the shape of a cam attached to a rotational drive system of the motor. The present invention is characterized in that a delay unit is provided that turns off the power to the motor after a predetermined delay time after detecting the stop position.

According to this configuration, the motor is continuously energized for the delay time specified by the delay unit after the switch detects the cam stop position, and the switch is sufficiently moved to the cam stop position. After that, the power to the motor is turned off.

Example An embodiment of the present invention will be described below with reference to FIG.

Components having the same functions as those shown in FIGS. 2 and 3 showing the conventional example will be described with the same reference numerals.

The motor control device of the present invention is different from the conventional one in that a delay section 10 is connected to the control section 5 as shown in FIG. 1, and here, the control section 5 is configured as follows. There is.

When the control unit 5 detects the dispensing instruction signal S, it starts energizing the motor 3, and at the timing T1 when the cam switch 7 detects the protrusion of the cam 6, the control unit 5 operates the delay unit IO, and at the timing T, When the delay unit 0 detects that the set delay time t has elapsed from .

With this configuration, the energization to the motor is terminated after the cam switch 7 sufficiently rides on the protrusion 9 of the cam 6, so there is backlash in the mechanical system, and the driven shaft immediately after the energization is turned off. Even if 2 is reversed, it is possible to avoid a situation where the cam switch 7 detects the outer circumferential portion 8 of the cam 6 as shown in FIG. 3(C).

Although the delay section 10 in the above embodiment is shown as a separate block from the control section 5, both can be constructed from one microprocessor and the necessary software written in the memory.

By configuring the set delay time t of the above embodiment to be arbitrarily variable, it is possible to easily accommodate drive systems of various devices having different degrees of backlash.

Effects of the Invention As described above, according to the present invention, the backlash in the mechanical system is large because a delay section is provided that turns off the power to the motor after a specified delay time after the switch detects the stop position of the cam. Even if the motor is stopped, the motor can be stopped while reliably maintaining the stop position, and normal intermittent drive can be repeatedly achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of a motor control device of the present invention, FIG. 2 is a block diagram of a conventional motor control device, and FIG. 3 is an explanatory diagram of a cam stop position and an energized state. 1... Product dispensing device, 3... Motor, 5...
Control unit, 6... cam, 7... cam switch [switch], 10... delay unit.

Claims (1)

[Claims] 1. The motor is configured to be stopped by detecting the shape of a cam attached to the rotational drive system of the motor with a switch, and the motor is stopped after a specified delay time after the switch detects the stop position of the cam. A vending machine motor control device equipped with a delay section that turns off power to the vending machine motor.