JPS5828458Y2 - Turntable gear motor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a turntable drive device in which a motor directly drives a turntable on which a recording disc is placed during recording and reproduction of information recording discs such as audio records.

Audio players that drive turntables directly have been developed, but most of these have a drive source that generates the driving force to move the pickup located near the thrust bearing of the motor shaft. As a result, the thrust bearing portion becomes open, resulting in a structure that is unfavorable in terms of bearing performance with respect to diffusion of bearing lubricating oil and incorporation of dust.

There are also motors in which this drive source is placed on the other end of the shaft that comes into contact with the thrust bearing, but none of these motors have a completely sealed thrust bearing, and this type of motor is also For these reasons, the configuration is unfavorable in terms of bearing performance.

In a configuration in which the pickup scanning body is transferred by roughly decelerating the rotation of the motor shaft, the clutch means that disconnects the pickup scanning body and the motor shaft when an overload is applied to the pickup scanning body is as follows: This is done in the process after the part where deceleration is directly performed from the motor, but the space required for this increases, and friction plates, etc. are used more frequently as a means of deceleration. It is inconvenient in this respect.

The present invention eliminates these drawbacks and will be described below with reference to its embodiments.

FIG. 1 is a schematic diagram of a recording disk reproducing apparatus equipped with a motor according to an embodiment of the present invention, in which 1 is a transparent cover, 2 is a case, and 3 is an operation switch.

4 is a turntable directly attached to the motor.

FIG. 2 shows the structure of the motor, and FIGS. 3 and 4 are enlarged views of its main parts.

5 is a bearing housing in which a radial bearing 6 and a stator 1 are respectively provided, and a thrust bearing 9 attached to a thrust bearing holding plate 8 is connected to a screw (not shown) through a rubber ring or the like (not shown). It is completely sealed and fixed.

This thrust bearing 9 allows the motor shaft 1 to
Holds one end of 1.

However, although not shown, the structure takes into account the escape of air inside the bearing.

Reference numeral 10 denotes a boss press-fitted or shrink-fitted onto the motor shaft 11, which includes a P rotor 12 and a rotor 1.
3 is fixed.

Further, a worm 14 is attached to the boss 10, which is slidable in the thrust direction and whose movement is restricted in the radial direction, and the turntable 4 is fixed to the upper part of the worm 14.

15 is a worm wheel that extracts output from the worm 14, and 16 is a shaft of the worm wheel.

Reference numeral 11 denotes a dust cover, which is constructed to have a magnetic shielding effect at the same time.

18 is a compression spring that releases the worm 14 upward when a load exceeding a predetermined value is applied to the worm wheel 15;
In combination with the worm 14, a clutch is constructed.

The operation of the embodiment configured as above will be described next.

Predetermined drive and control circuitry (not shown) in steady state
When the motor is driven, the worm 14 rotates synchronously with the motor in the state shown in FIG. A drive source that generates a driving force that is synchronized with the rotation of the motor that has been decelerated can be obtained.

The driving force generated by this driving source is used to move the scanning body.

When a load exceeding a predetermined value is applied to the worm wheel 15 in a steady state, for example, when the scanning body transport device driven by the drive source is locked by some force, the worm 14 is thrust in the thrust direction as shown in FIG. The force becomes larger than the pressing force of the compression spring 18, and the worm 14
moves in the direction of arrow B in the figure, disengages from the worm wheel 15, and prevents excessive load from being applied to the motor.

In this state, when the load on the worm wheel 15 reaches a predetermined state, the pressing force of the compression spring 18 acts against the force of the worm 14 in the thrust direction, and the worm 14 moves downward.
The state returns to the steady state shown in FIG. 3 where the worm wheel 15 is engaged.

The relationship between the rotational direction of the motor and the torsional direction of the worm 14 as viewed from the turntable 4 side, which is important in this series of operations, will be explained.

Now, the rotation direction of the motor is clockwise, and the worm 14
If the twist direction is to the left, the above-mentioned series of operations will be performed.

In this case, if the twisting direction of the worm 14 is set to the right, a configuration in which the worm 14 moves downward is possible.

Further, when the rotation direction of the worm 14 and the motor is counterclockwise, the relationship between the rotation direction of the worm 14 and the motor is completely reversed.

As is clear from the above embodiments, according to the present invention, since the thrust bearing portion is of a sealed type, it is possible to prevent the ingress of dust and the like, and it is possible to obtain a configuration favorable in terms of bearing performance.

In addition, the drive source synchronized with the rotation of the motor can be easily taken out.

In addition, a simple structure can be used as a means for preventing overload from the drive source to the motor, so it does not take up much space, and by providing the preventive means, the synchronization with the rotation of the motor of the drive source is lost. Never get caught.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a recording disk reproducing device, FIG. 2 is a side view of a turntable direct drive motor according to an embodiment of the present invention, and FIGS. 3A and 3B are a side view and a perspective view of essential parts, respectively. 4A and 4B are a side view and a perspective view, respectively, of the same essential part in another state. 4... Turntable, 5... Housing, 9... Thrust bearing, 11...
Motor shaft, 14... Worm, 15...
... Worm wheel, 18 ... Compression spring.

Claims (1)

[Scope of utility model registration request] A turntable is fixed to one end of the motor shaft that is fixed to the rotor, and the other end is connected to a thrust bearing.
A bearing having a bottomed structure is held in the bottomed part of the housing, and is attached to the motor shaft between the turntable and the rotor part, so that the worm can be rotated integrally with the motor shaft in the rotational direction, and the worm is attached to the motor shaft. The worm is provided so as to be slidable in the axial direction, and an elastic biasing force is applied to the worm by a compression spring so that the worm moves in one of the sliding directions,
A worm wheel that engages with the worm drives a drive device that transports the scanning object, and when an excessive load is applied to the worm wheel, the worm resists the biasing force of the compression spring and drives the motor. A turntable direct drive motor configured to slide in the axial direction of a shaft to disengage the worm wheel and the worm.