JPS6037685Y2 - Tone arm lift device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a tone arm lift device.

In a record player, a lift device that raises the tone arm when stopping or ending record play is
It is necessary to maintain the height of the tone arm at an appropriate height from the viewpoint of dust cover and appearance, and if the tone arm has a light stylus pressure, sudden operation may cause the tone arm to fly up during the upward operation, which may cause an accident. There is a risk that this may occur.

The present invention was developed in consideration of these points, and it is possible to easily adjust the height of the lift plate relative to the lift axis, and also to prevent the tone arm from suddenly jumping up during the lifting operation. This is what I did.

Next, an embodiment of the present invention will be described with reference to the drawings.

1 is a fixed plate, a bearing 2 is fixed to the fixed plate 1, and a cylindrical support rod 3 is fitted into the bearing 2 so as to be vertically movable.

This support rod 3 has a small-diameter fitting hole 4 formed in the axial direction in the upper part, and a large-diameter screw hole 5 connected to the lower part of this fitting hole 4, and the lower end surface has a spring receiving part 6. will be established.

Then, a lift plate 7 is fixed to the upper end of the support rod 3.

Reference numeral 8 denotes a lift shaft fitted into the support rod 3. The lift shaft 8 has a small-diameter operating portion 9 formed in its upper portion that fits into the fitting hole 4, and a lower portion of the operating portion 9. A threaded portion 10 that is screwed into the screw hole 5 is formed in a continuous manner, and a guide portion 11 is formed in a continuous manner at the lower end of this threaded portion 10.
An interlocking body 12 made of synthetic resin or the like is fitted in the central part of the interlocking body 12 through a through hole 13 in the vertical direction so as to be vertically movable. A removal stopper piece 15 is attached to the lower end of the guide portion 11.

Then, the cam 16 is brought into contact with the lower surface of the interlocking body 12, and the cam 16 is slid by the rotation of the waist operating section 17, and the lift is placed between the upper surface of the interlocking body 12 and the spring receiving section 6 of the support rod 3. The shaft 8 is communicated, a buffer coil spring 18 is compressed and interposed, and the support rod 3 is supported on the cam 16 via the interlocking body 12 and the buffer coil spring 18.

Further, a large diameter compression coil spring 19 is interposed coaxially with the buffer coil spring 18 between the interlocking body 12 and the bearing 2.

Further, a jig engaging portion 20 is formed on the upper end surface of the operating portion 9, and a jig is engaged with this engaging portion 20 to form the lift shaft 8 so as to be vertically adjustable with respect to the support rod 3. .

Then, when the cam 16 is rotated by the operation shaft 17, the interlocking body 12 in contact with the cam 16 is lifted upward, and the interlocking body 12 rises along the guide portion 11 of the lift shaft 8, and the buffer coil spring 18 is compressed, and the restoring force of this compression causes the support rod 3 to slide on the bearing 2 via the oil O interposed between them, and the lift plate 7 rises.

In this way, the lifting position of the lift plate 7 is determined by the cam 16 according to a predetermined dimension on the circumferential side of the cam 16.
When the operating shaft 17 is operated quickly and the cam 16 rotates at high speed,
The interlocking body 12 tries to jump up rapidly, but the buffer coil spring 18 and the compression coil spring 19 absorb this rotational force, and then the support rod 3 rises due to the restoring elastic force of the buffer coil spring 18. This restoration process is relatively gradual, and the support rod 3 and bearing 2
Since the oil O interposed in the lift shaft 8 has a constraining effect,
is gradually raised, and therefore the lift plate 7 fixed to the lift shaft 8 can be prevented from suddenly jumping up.

In particular, the buffer coil spring 18 supports the support rod 3 and the lift plate 7, and the tip position is variable and not fixed, so when the rotational force of the cam 16 is large, the buffer coil spring 18 absorbs this rotational force. At first, the interlocking body 1 is compressed with the lift shaft 8 as it is.
2 moves, and then the restoring force of the buffer coil spring 18 acts to push up the support rod 3, and the lift shaft 8 also rises to maintain balance.

Therefore, even when the cam 16 rotates particularly rapidly, the rising speed of the lift shaft 8 is moderated and the lift shaft 8 rises with a delay. Jumping up is reliably prevented.

In addition, in contrast to the downward biasing force of the compression coil spring 19, the biasing force of the buffer coil spring 18 moves upward to support the support rod 3 and the lift plate 7, and is relaxed upward, reducing the rotational resistance of the cam 16. Can be made smaller.

Further, the support rod 3 and the lift shaft 8 are connected and integrated through a wide range of surface contact, and the lift plate 7 is firmly fixed to the support rod 3, and the above-mentioned coil springs 18 and 19 are arranged inside and outside. Because of this, the movement of the lift plate 7 is extremely stable and does not oscillate.

In addition, the lift shaft 8 can be moved up and down in the axial direction relative to the support rod 3 by simply inserting a jig into the jig engaging portion 20 at the upper end of the operating section 9 of the lift shaft 8 and rotating the lift shaft 8. ,
The height position of the lift plate 7 can be regulated and handling is extremely easy.

Furthermore, when the lift plate 7 is held at a high position, the compression coil spring 19 does not change, but the buffer coil spring 18 becomes stretched, which increases the ability of the lift plate 7 to reduce the impact force. Jumping can be prevented efficiently at higher positions depending on the height.

According to the present invention, a support rod is provided on the bearing so as to be movable up and down, a lift shaft is fitted into the support rod so as to be adjustable in vertical movement, an interlocking body is provided on the lift shaft and is movable up and down to interlock with the cam, and ,
A coil spring is interposed between the interlocking body and the support rod, the support rod is supported by the coil spring, and the lift plate is fixed to the support rod and raised, so the relative position of the lift shaft with respect to the support rod can be adjusted. The height of the lift plate can be adjusted by changing the height of the lift plate. Therefore, the height of the tone arm can be easily adjusted and the tone arm can be prevented from jumping up suddenly when the lift shaft is raised.

Note that by interposing oil between the support rod and the bearing, it is possible to provide a better braking effect against the sudden rise of the support rod.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing one embodiment of the device of the present invention;
The figure is a plan view of the lift plate mounting portion. 2...Bearing, 3...Support rod, 5...
...Screw hole, 7...Lift plate, 8...
...Lift axis, 12---Sequential moving body, 18...
...Buffer coil spring.

Claims (1)

[Scope of utility model registration request] A bearing, a support rod that is fitted into the bearing so as to be movable up and down and has a screw hole in the inner axial direction, a lift plate that is fixed to the upper end of the support rod and on which the tone arm is placed, and a screw hole in the support rod. A lift shaft is screwed to the vertically adjustable lift shaft,
The lift shaft is characterized by comprising an interlocking body provided at the lower end of the lift shaft so as to be movable up and down and abutting the cam, and a buffer coil spring interposed between the interlocking body and the lower end of the support rod. Tone arm lift device.