JPS6122467A - Loading player - Google Patents

Abstract

PURPOSE:To prevent a record tray from being an unstable state due to an external force by keeping a prescribed current flowing to a motor when two switches are provided and the record tray is placed at the specified position at the inside or the outside. CONSTITUTION:When the record tray 3 is moved toward the outside or inside, a switch 4 or 5 is turned on and a motor drive circuit 8 interrupts a drive current, since specified current is kept flowing to the motor 1 through a resistor 9 or 10, the record tray 3 is pushed always to the inside or outside with a prescribed force. Thus, even after the record tray 3 reaches a prescribed inside or outside and motor current is interrupted, since a prescribed force is applied to the record tray 3, instability such as vibration of the record tray 3 due to an external force is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a loading type record player in which records can be taken in and out from the front or top of the device.

Conventional configurations and their problems In recent years, audio equipment has become more space-saving, and one example of this is the increasing number of front-loading record players (hereinafter abbreviated as FL players) that allow records to be loaded and unloaded from the front of the device. There is.

A conventional 'FL player will be explained below.

FIG. 1 is a block diagram of a conventional FL player, where 1 is a motor and 2 are gears 2a and 2b that mesh with each other.

2C is a reduction gear, 3 is a record tray, 4 is an outer switch, 5 is an inner switch, 6 is an instruction switch operated by the user, 7 is a control circuit, and 8 is a motor drive circuit.

The operation of the FL player configured as described above will be explained below.

The user attempts to move the record tray 3 by operating the switch 6. Control circuit 7 instructs motor drive circuit 8 to drive motor 1 in response to a signal from switch 6 . The rotation of the motor 1 is converted into parallel movement of the record tray 3 via a reduction gear 2.

When the record tray 3 moves outward or inward and detects that the switch 4 or the switch 5 is turned on, the control circuit 7 stops the rotation of the motor 1.

However, in the conventional configuration described above, the motor current is stopped when the record tray 3 reaches a specified position inside or outside. When the instrument was played out of position, or when the switch was near the on-on boundary, forced force and motor driving force were applied alternately, causing a state of vibration.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a loading player in which the record tray does not become unstable due to external force.

Structure of the Invention The present invention comprises a motor, a reduction gear that speeds up the rotation of the motor and converts it into linear motion of a record tray, and a motor drive circuit.
A switch that is turned on when the record tray is in a specified position on the inside, a switch that is turned on when the record tray is in a specified position on the outside, signals from the above two switches, and a signal instructed by the user. The system is equipped with a control circuit that controls the motor drive circuit described above to rotate the motor in the forward or reverse direction, and continues to supply a constant current to the motor even when the record tray is in the specified position inside or outside. The record tray is always pressed inward or outward with a constant force, thereby preventing the record tray from becoming unstable due to external force.

DESCRIPTION OF THE EMBODIMENT FIG. 2 shows a block diagram of an FL player in an embodiment of the present invention. 1 to 8 are the same as in FIG. 1, and their explanation will be omitted.

9 is a resistor for passing a bias current from point a to point b in motor 1 when point b is at a low potential (ground), and 1o is a
This resistor is used to cause a bias current to flow through the motor 1 from point b to point a when the point is at a low potential.

The operation of the FL player of this embodiment configured as described above will be explained below. The functions of 1 to 8 are the same as those shown in FIG. 1, and although the explanation is omitted, the motor drive circuit 8
For example, when the record tray 3 moves from the outside to the inside, if a current is applied to the motor 1 in the direction from point a to point b, the switch 5 remains on, and even after the motor current is stopped, the point b remains constant. This is to keep it grounded. Similarly, in the opposite case, point a remains grounded even after switch 4 is turned on. Therefore, the record tray 3 moves outward or inward, and the switch 4
Alternatively, even after the switch 5 is turned on and the motor drive circuit 8 cuts off the drive current, the resistor 9. Alternatively, a specified current continues to flow to the motor 1 through the resistor 1o, and a constant force is continued to be applied to the record tray 3.

As described above, according to this embodiment, even after the record tray 3 reaches a predetermined position inside or outside and the motor current is cut off, one of the terminals of the motor 1 corresponding to the position of the record tray 3 is grounded. By passing a specified current through the resistor 9 or 10 and continuing to apply a constant force to the record tray 3, unstable phenomena such as vibration of the record tray 3 due to external force can be prevented.C Effect of the Invention The present invention consists of a motor, a reduction gear that decelerates the rotation of the motor and converts it into linear motion of the record tray, a motor drive circuit, a switch that is turned on when the record tray is in a specified position on the inside, and a switch that turns on when the record tray is on the outside. A switch that turns on when it is in the specified position; 1. It is equipped with a control circuit that controls the motor drive circuit to rotate the motor in the forward or reverse direction according to signals from the two switches and the operation switch. Since a constant current continues to flow through the record tray, unstable phenomena such as vibration of the record tray due to external force can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional loading player, and FIG. 2 is a block diagram of a loading knob player according to an embodiment of the present invention. 1...Motor, 2...--Reduction gear, 3...
・River・Record tray, 4, 6... Switch,
6... Operation switch, 7... Control circuit, 8... Motor drive circuit, 9.10...
·resistance.

Claims (1)

[Claims] a motor, a reduction gear that decelerates the rotation of the motor and converts it into linear motion of the record tray, a motor drive circuit that drives the motor, and a switch that is turned on when the record tray is at a prescribed position inside; a switch that is turned on when the record tray is in a prescribed position on the outside;
A control circuit that controls the motor drive circuit based on the signals from the two switches and the signal from the operation switch, and rotates the motor forward or reverse; and when the record tray is at a specified position inside or outside. A loading player further comprising means for continuing to supply a constant current to the motor.