JPS5819746Y2 - record player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a record player in which the start and stop times of the turntable are shortened.

Conventionally, direct drive type record players have low starting torque, take a long time to start up,9 and take a long time to stop.

For this reason, there is a long blank time from when the turntable is turned on when turning on a record until it reaches the normal rotation speed, or from when the turntable is turned off to when the turntable stops rotating when replacing a record, which is a waste of time for the user. It had the disadvantage of being time consuming.

The present invention has been devised to eliminate the above-mentioned drawbacks, and will be described with reference to an embodiment shown in one drawing. It is a rotary plunger having a rotating center shaft 2 which returns to its original position by a built-in thinly coiled return spring when turned off, and a fan-shaped flat plate cam 5 having an arcuate pressure contact portion 4 around the periphery is fixed to this center shaft 2. This pressure contact portion 4 is provided with a starting braking device that is in close contact with the inner circumferential surface (or outer circumferential surface) of the turntable 3.

Since the present invention has the above structure, when the motor drive switch is turned on, the plunger 1 is also turned on.
As shown in Fig. 2, the cam 5 rotates to the right according to the rotation of the center axis 20, and the arc-shaped pressure contact portion 4 attached to the periphery comes into close contact with the inner peripheral edge of the turntable 3. , start turntable 3 to the right.

As soon as the turntable 3 starts rotating, the rotational force of the motor is transmitted, and the normal rotational speed can be quickly reached.

At that time, as shown in FIG. 3, the tip pressure contact portion 4 is separated from the inner peripheral edge of the turntable 3, and the cam 5 is located inside the turntable 3.

During this starting time, the large amount of electrical energy required to start the motor is not required, so the load placed on the motor is small.

Conversely, when stopped, the motor and drive switch are turned off, and at the same time the plunger 1 is also turned off, and the thin unwinding spring built into the plunger 1 works to follow the rotation of the central shaft 2 (as shown in Figure 2).・When the cam 5 rotates to the left, the arc-shaped pressure contact part 4 attached around the cam 1 comes into contact with the inner peripheral edge of the turntable 3, and acts to brake the rotation of the turntable 30, and the motor and turntable 3 are rotated due to inertia. Since it is rotating, you can quickly stop the rotation.

When the cam 5 completes its rotation, as shown in FIG. 1, half of the tip pressure contact portion 4 comes into close contact with the inner peripheral edge of the turntable 3 and returns to the position before use.

In this way, due to the rotational force of the plunger 1 and the rotation of the cam 50, the turntable 3 is started to rotate by the pressure contact part 4, and the thin winding return spring built in the plunger 1 and the rotation of the cam 50 cause the pressure contact. This is a record player in which a brake is applied to a turntable 3 by a section 4.

Therefore, even if the player has a small torque motor or a turntable with a high rate of inertia, the player can quickly reach steady rotation and stop quickly.

Furthermore, since a high starting torque motor is not required, the S/N ratio is improved and less electric power is required, which has the effect of reducing costs.

Although the above-mentioned embodiment describes the case where the activation braking device is located inside the turntable, the present invention also includes a case where the activation braking device is located outside the turntable.

When the motor drive switch is on, the rotary plunger is turned off, and the motor drive switch is turned on.
This includes a case in which the motor drive switch and the rotary plunger are in opposite phases so that the rotary plunger is ON when the FF is on, and this differs from the embodiment when the cam 5 is in a stopped or rotating state. It is something.

As described above, the present invention uses a motor drive switch and a rotary plunger at the same time to kick start the turntable and apply a brake effect using the cam fixed to the center axis of the plunger.
This is an idea with great practical value for record players that shortens the start-up and braking time of turntables.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the apparatus of the present invention in a stopped state, FIG. 2 is a block diagram of the apparatus of the present invention in a starting braking state, and FIG. 3 is a block diagram of the apparatus of the present invention in a rotating state. 1 is the plunger, 2 is the center shaft, 3 is the turntable
4 is a pressure contact part, and 5 is a cam.

Claims (1)

[Claims for Utility Model Registration] The energized samurai rotates at a predetermined angle and maintains that rotational position. An arc-shaped pressure contact portion 4 is formed on the outer periphery of the rotation center shaft 2 of the plunger 1, which has a rotation center shaft 2 that returns to its original position by a built-in thinly coiled return spring when power is interrupted. The cams 5 and 9 actuate the plunger 1 to rotate the cam 5 one rotation in the opposite direction of the turntable 30 in conjunction with the ON/OFF operation of the drive switch of the motor that drives the turntable 3. A record player equipped with a starting braking device for moving the record player.