JPS60258758A - Loading device - Google Patents

Abstract

PURPOSE:To prevent a motor drive circuit and a loading motor from being damaged even when loading is disturbed due to an external force by providing an overcurrent detecting circuit detecting an overcurrent flowing to the motor drive circuit of the loading device. CONSTITUTION:The motor driver of a front loading device is provided with an overcurrent detecting circuit 7. Through the constitution above, when the front loading device is disturbed on the way of open or closed state, it is detected so as to stop the front loading motor 1 or reverse the direction, thereby preventing the front loading motor, the motor drive circuit 2 and the front loading mechanism from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a loading device, and more particularly to an improvement in its motor drive device.

Conventional configurations and their problems In recent years, front loading devices, that is, devices that allow sliding parts that are slidably housed inside the device body to be inserted and removed from the front of the device body, have come to be used in various devices. .

A conventional front loading device will be explained below.

FIG. 1 shows a motor drive device of a conventional front loading device. 1 is a front loading motor, 2 is a motor drive circuit that drives the front loading motor 1, and 3 is a motor drive circuit that controls the direction of current flowing through the front loading motor 1. A logic circuit is switched through the drive circuit 2, 4 is an open/close key, 5 is a close switch that is turned on when the front loading device is closed, and 6 is an open switch that is turned on when the front loading device is fully opened. Further, arrows a and b in the figure indicate the direction of the current, and the direction a moves the front loading motor 1 in the direction in which the front loading device opens, and the direction b moves the front loading motor 1 in the direction in which the front loading device closes.

The operation of the conventional motor drive device for a front loading device configured as described above will be described below.

Close switch 5 is on, open switch 6
When the open/close switch 4 is pressed in the off state, the logic circuit 3 moves the motor drive circuit 2 so that current flows in the a direction, the front loading device moves in the open direction, and the close switch 5 turns off. When it is fully opened, the open switch is turned on and the logic circuit 3 stops the front loading motor. In this state, if you press the open/close switch 4 again, the logic circuit 3 will
The motor drive circuit 2 is moved so that current flows in the direction, the front loading device moves in the closing direction, and the open switch is turned off. Once fully closed, the close switch is turned on and logic circuit 3 stops the front loading motor.

However, in the above configuration, when the front loading device is about to open, the open switch 6
When an external force acts to prevent the front loading device from opening before the front loading device is turned on, a large current continues to flow through the motor drive circuit, potentially damaging the motor drive circuit, front loading motor, or front loading mechanism. .

Purpose of the Invention The present invention is intended to improve the above-mentioned conventional problems, and provides a loading method in which the motor drive circuit, loading motor, and loading mechanism are not damaged even if loading is prevented by an external force while the loading device is opening or closing. The purpose is to provide equipment.

Structure of the Invention The present invention provides a loading motor that drives a loading device, a motor drive circuit that drives the loading motor, a logic circuit that controls the direction of current flowing to the loading motor through the motor drive circuit, and a motor drive circuit that controls the direction of current flowing to the loading motor through the motor drive circuit. This loading device is characterized by being equipped with an overcurrent detection circuit that detects overcurrent flowing through the circuit, and when the front loading device is interrupted by an external force while opening or closing, the motor It is possible to prevent damage to the loading device by detecting overcurrent flowing through the motor and stopping the motor or reversing the direction of rotation.

DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows a motor drive device for a front loading device according to an embodiment of the present invention. In FIG. 2, 7 is an overcurrent detection circuit, and the other parts are exactly the same as in FIG. 1.

The operation of the motor drive device of the front loading device of this embodiment configured as described above will be described below.

First, when the front loading device is prevented from loading by an external force during opening or closing, a large current flows through the nine-motor drive circuit 2, which has a heavy load on the front loading motor 1.

This large current is detected by the overcurrent detection circuit 7, and the logic circuit 3 is activated by this detection signal to completely stop the front loading motor 1 or reverse the rotation direction.

As described above, according to this embodiment, by detecting the large current flowing through the motor drive circuit with the overcurrent detection circuit 7, it is possible to detect when the front loading device is disturbed by an external force during opening or closing. , the front loading motor 1 can be stopped or the rotation direction can be reversed, and damage to the front loading motor, motor drive circuit, and front loading mechanism can be prevented.

Note that the present invention is not limited to a front loading device in which the sliding portion is inserted and removed from the front surface of the device, but can also be applied to a loading device in which the sliding portion is inserted and removed from the top surface of the device.

Effects of the Invention According to the present invention, by providing an overcurrent detection circuit that detects an overcurrent flowing in the motor drive circuit of the loading device, when loading is prevented by an external force while the loading device is opening or closing, the motor It is possible to detect overcurrent flowing in the drive circuit and stop the rotating motor or reverse the rotation direction. Damage to the motor drive circuit, rotary motor, and rotary puffer mechanism can be prevented.

[Brief explanation of the drawing]

FIG. 1 shows a motor drive device for a conventional front loading device, and FIG. 2 shows a motor drive device for a Noron Trotting device according to an embodiment of the present invention. 1 front loading motor, 2 motor drive circuit, 3 logic circuit, 4 open/close switch, 5.
- Clore (switch, 6 open switch, 7 overcurrent detection circuit, a direction oven direction, b direction ・close direction O 1 Name of agent Patent attorney Toshio Nakao and 1 other person No. 11-1 Figure 2

Claims (1)

[Claims] a loading motor for moving a sliding part slidably housed in the device body into and out of the device body; a motor drive circuit for driving the loading motor; and a motor drive circuit for driving the loading motor; comprising a logic circuit for controlling the direction of current and an overcurrent detection circuit for detecting overcurrent flowing through the motor drive circuit, and controlling the logic circuit by the output of the overcurrent detection circuit;
A loading device characterized in that the loading motor is configured to stop or reverse its rotational direction when an overcurrent occurs.