JPS5810224Y2 - High precision turntable drive device - Google Patents

Description

[Detailed description of the invention] This invention differs from the turntable of a normal record player in that it is a turntable with a large flywheel effect, such as a total weight of 20.7 tons and an inertial mass of 3.5 tons.
One to several arm bases, which are pivotally supported at the center of a stable tripod frame such as Nos. 5 and 9 and which freely rotatably support several pickup arms, are fitted onto the legs of the tripod frame and bolted. This invention relates to a turntable drive device for a high-precision record player in which the turntable of a high-precision record player is rotated by the turntable of a normal record player.

The turntable of a regular record player is roughly IK.
y, the inertial mass is small and the flywheel effect is small, so there is some rotational unevenness and it is difficult to achieve a satisfactory effect on stereo record playback.

For this reason, the high-precision record player mentioned above was developed, but in order to drive the turntable of this player, a special motor installed in a heavy-duty motor case with sufficient anti-vibration measures was included as a set. A belt must be placed between the pulley of the main shaft of the motor and the turntable.

Since the rotation speed of the dedicated motor is constant, the turntable is switched between 33 rotations and 45 rotations using a stage wheel, which makes it troublesome to change the belt. The price of the set is extremely high, which prevents it from becoming popular among people other than high-end record enthusiasts.

The dedicated motor has enough torque to quickly raise the heavy turntable of a high-precision record player to the specified rotation speed, but it takes some time to drive the turntable of a normal record player. It is possible to increase the rotation speed to the specified speed by applying the rotation speed, and since the inertial mass is large, it is possible to obtain a stable rotation speed after reaching the specified rotation speed, and it is easy to change the rotation speed. It is possible to drive it without purchasing a motor at the same time.

However, since there is no mechanical connection to each other, it is usually impossible to use the player's motor.

The present invention is designed to make such an impossible task possible very easily, and one embodiment thereof will be described as follows.

1 in the figure shows an example of a high-precision record player, in which the outer periphery 3 of a turntable 2 made of gunmetal weighing 20 kg is used as a belt hooking surface, and the center thereof is a tripod with legs 5 protruding in three directions at angular intervals of 120°. It is pivotally supported by a boss 6 at the center of the frame 4.

A leg 1 made of Teflon (registered trademark) is attached to each end of the leg 5, and the base of the pickup 11 is rotatably supported on one or all of the mounting legs 8 projecting from the upper part of the insertion tube. An arm base 9 provided with a hole 10 through which the body 12 is inserted is fitted and firmly fixed with a bold.

A is an ordinary record player, and a turntable b that is driven at variable speed by a motor is provided on the top surface, and a center spindle c protrudes from the center of the turntable b.

13 fd On the above-mentioned ordinary record player a (7) turntable b, there is a disc-shaped disc-shaped disc whose center hole 14 is tightly fitted into the center spindle C so that it can be rotated at the same speed as the turntable b by friction. The drive mat is provided with a belt fitting circumferential groove 15 on its outer periphery, the groove bottom of which has the same diameter as the outer periphery 3 of the turntable 2.

17 is the outer periphery 3 of the turntable 2 and the drive mantle 1
This is a belt that can be freely hung on and removed from the belt fitting circumferential groove 15 of No. 3.

Although the cross-sectional shape of the drive mat is free, a cloth 16 may be attached to the lower surface or a rough surface may be provided to increase the frictional force.

The present invention has the above-mentioned structure, and the drive mat 13 with the center spindle C fitted with the center hole 14 is placed on the turntable b of a normal record player a, and the belt fitting circumferential groove 15 and the high precision record player 1 are connected to each other. A belt 17 is wrapped around the outer periphery of the turntable 2, and a motor that drives the turntable b drives the turntable b1 via a drive mat 13 and a belt 11.

The present invention has the above-mentioned configuration, and even if the high-precision record player 1 and the dedicated motor are not provided as a set,
Place a disc-shaped drive mat 13 on the turntable of a normal record player in exactly the same way as when placing a record, and then hook and pass the belt 17 between the drive mat 13 and the outer periphery 3 of the high-precision player 1. It is possible to enjoy a high-quality record performance without sound distortion just by straining the recorder, and since a dedicated motor is not required, the cost of the motor is low and the effect can be obtained.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional side view of the center of the high-precision record player 1 and the drive mat 13, and FIG. 2 is a perspective view showing the present invention in use. 1... High-precision record player, 2...
...Turntable, 3...Outer circumference, 4...
...Tripod frame, 11...Pickup, a
・・・・・・Normal record player b・・・・・・
・Turntable, C... Center spindle, 13... Drive mat, 14...
Center hole, 17...Belt.

Claims (1)

[Scope of utility model registration request] A high-precision record player in which a turntable with a large total weight, inertial mass, and flywheel effect is pivotally supported on a heavy and stable tripod frame, and an arm base that supports a pickup arm is tightened and fixed to the tripod frame. The outer diameter is the same as the outer circumference of the turntable,
A disc-shaped drive mat has a center hole that is almost tightly fitted into a center spindle provided on a turntable of a normal record player, and an outer periphery of the drive mat and an outer periphery of the turntable of the high-precision record player. A drive device for a turntable of a high-precision player, comprising a pulley that can be hung.