JPS6132261A - Front loading device - Google Patents

Abstract

PURPOSE:To prevent a record, etc., from being broken when it is caught at a front loading part by inverting the loading direction when detecting an overcurrent flowing through a motor driving circuit for longer than a specific time, and stopping the loading when the number of times of the inversion exceeds a specific value. CONSTITUTION:If an overload is placed on the motor 1 while a front part is open or closed, the overcurrent flowing through the motor driving circuit 2 is detected by an overcurrent detecting circuit 7, which sends a detection signal to a logical circuit 8. When this detection signal is inputted to the logical circuit 8 continuously for longer than the specific time, the logical circuit 8 inverts the loading direction and when the number of times of this inversion exceeds the specific value, the loading motor 1 is stopped. Consequently, a front loading mechanism and a motor driving circuit are prevented from being broken and if a record, etc., are caught at the front part, they are prevented from being broken.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a front loading device in a record player.

"Conventional Structure and Problems Thereof" In recent years, with the diversification of audio devices, front-loading devices have come to be used as record players.

A conventional float loading device will be explained below. Figure 1 is a block diagram of a conventional front loading device, where 1 is a front loading motor, 2 is a front loading motor, and 2 is a front loading motor.
3 is a motor drive circuit that supplies drive current to motor 1, and 3 is the rotation direction of motor 1.

A logic circuit for controlling start and stop, 4 is an open close switch, 6 is a close switch that detects that the front loading section is closed, and 6 is an open switch that detects that the front loading section is fully opened.

The operation of the front loading device configured as described above will be explained below.

When the switch 4 is pressed by operating the open/close key while the close switch 6 is on, the logic circuit 3 outputs a signal in the direction of opening the front to the motor drive circuit 2, and the motor drive circuit 2 drives the motor 1. , the front is opened and the close switch 6 is turned off. When the front 1 is completely opened, the open switch 5 is turned on, the logic circuit 3 outputs a stop signal to the motor drive circuit 2, and the motor 1 is stopped. Next, in this state, when switch 4 is pressed by operating the open/close key, a signal is output from logic circuit 3 to motor drive circuit 2 in the direction of closing the front, motor drive circuit 2 drives motor 1, and the front closes. Then, the open switch 6 is turned off, and when it is fully closed, the close switch 6 is turned on, a stop signal is output from the logic circuit 3 to the motor drive circuit 2, and the motor 1 is stopped.

However, in the configuration described in item 2, when the motor is overloaded by an external force while being loaded onto the front section, a large current flows through the motor drive circuit 2, which may destroy the motor drive circuit 2 or damage the front section. This had the disadvantage that when records etc. were inserted between them, they would be damaged.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and prevents the front loading mechanism and motor drive circuit from being destroyed when an overload is applied to the front loading section, and prevents records, etc., from being stored in the broken front section. It is an object of the present invention to provide a front loading device that can prevent them from being damaged when sandwiched.

Structure of the Invention The front loading device of the present invention includes: a front loading motor, a motor drive circuit that drives the motor, and a logic circuit that controls the motor drive circuit.
1. It is equipped with a drive circuit that drives the overcurrent of the motor drive circuit, and when an overload is applied to the motor, it detects the large current that flows through the motor drive circuit for a specified time and reverses the rotation direction of the motor. The structure is such that the motor can be stopped when the reversal by the motor reaches a predetermined number of times or more.

DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows a block diagram of a front loading device in one embodiment of the present invention. In FIG. 2, numerals 1 to 6 are the same components as in FIG. 1, and the description on page 5 will be omitted. Reference numeral 8 indicates a drive circuit that drives the overcurrent of the motor drive circuit 2, and 8 indicates a logic circuit that controls loading based on an overcurrent detection signal.

The operation of the front loading device of this embodiment configured as described above-1- will be described below. Opening/closing of the front section by the open/close switch 4 is the same as that shown in FIG. 1, and the explanation thereof will be omitted. In this embodiment, when the motor 1 is overloaded while the front section is open or closed, the overcurrent detection circuit 7 detects the overcurrent flowing through the motor drive circuit 2 and sends a detection signal to the logic circuit 8.

If this detection signal is continuously input to the logic circuit 8 for a predetermined period of time or more, the logic circuit 8 reverses the loading direction, and in addition, when the reversal by the motor exceeds a predetermined number of times, the loading motor 1 is stopped.

As described above, according to this embodiment, when an overload is applied to the front section during loading, by detecting that this motor has been running for a certain period of time, the loading direction can be reversed. Overload 6 base.

If the reversal of loading is more than a specified number of times, loading can be stopped.

Effects of the Invention The present invention detects that the overcurrent flowing through the motor drive circuit continues for a certain period of time when an overload is applied to a front loading motor. If the loading direction is reversed a predetermined number of times or more, loading is stopped. This has the advantage of preventing destruction of the motor drive circuit and damage to records etc. when they are inserted into the front loading section.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional front loading device for a record player, and FIG. 2 is a block diagram of a front loading device in an embodiment of the present invention. 1...Motor, 2...Motor drive circuit, 4...A・t￥-Punrose Suinochi, 6...
・・Close switch 7 bezel, 6・・Open switch, 7・・・・
- Overcurrent detection circuit, 8...Logic circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person @1
Figure 2

Claims (1)

[Claims] A front loading motor, a drive circuit that drives this motor, an overcurrent detection circuit that detects overload of the motor using the current of this drive circuit, and a signal from this overcurrent detection circuit that controls the motor. A front loading device comprising a logic circuit and configured to reverse the direction of rotation when the motor is overloaded for a predetermined time or more, and to stop the motor when the reversal due to the overload reaches a predetermined number of times. .