JPS5914887Y2 - Tone arm elevation device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an elevation device that moves a tone arm up and down.

Conventionally, this type of elevation device moves the tone arm up and down by joining surfaces with high friction, so the position of the stylus tip is different depending on the up and down movement of the tone arm, and therefore the stylus tip is not aligned with the record. When the stylus is separated from the record or placed on the record, lateral pressure is applied to the stylus tip, which may damage the stylus tip or the record.

This invention attempts to solve the above-mentioned drawbacks.
This will be described in detail with reference to the illustrated embodiment. In FIG. 1, reference numeral 1 denotes a tone arm, and a receiver 4 having a V-shaped groove 3 on the lower half surface near the bearing portion 1 is fixed to the tone arm 1.

5 is an elevation mechanism for moving the tone arm 1 up and down; 6 is an arm of the mechanism; the free end of the arm 6 has a V-shaped groove facing the receiver 4; 3 is provided with a wedge-shaped engaging element 7, but this engaging element 7 may be plate-shaped as shown in FIG.

A pin 8 is fixed to the base end of the arm 6, and this pin 8 is attached to an upper and lower bearing plate 1 protruding from a vertically movable support shaft 9a.
It is rotatably supported between 0a and 10b.

Therefore, the arm 6 can rotate left and right about the pin 8 as a fulcrum.

Reference numeral 11 denotes a spring tensioned between the base end of the arm 6 and the support shaft 9a.This spring 11 always aligns the longitudinal direction of the arm 6 with the longitudinal direction of the bearing plates 10a and 10b, but its elastic force is quite weak, and it should be noted that the support shaft 9
a is supported by a guide shaft 9b so as to be vertically movable.

Reference numeral 12 denotes a vertically movable plate, the base of which is pivotally supported via a shaft 13, and a fork portion 14 at its free end loosely fitted into a circumferential groove formed below the support shaft 9a.

15 is a movable bar for vertically moving the vertically moving plate 12 mentioned above.

Next, the operation of the above embodiment will be explained with reference to FIG.

When the vertical moving plate 12 is pushed up by the movable bar 15, the engaging element 7 moves upward via the support shaft 9a and the animation 6, and engages with the V-shaped groove 3 of the receiving element 4 of the tone arm 1.
lift up.

When the engaging element 7 is inserted into the V-shaped groove 3 of the receiving element 4, as shown in FIG. 6 rotates around the pin 8, the apex 7a slides on the slope of the V-shaped groove 3, reaches the peak 3a, and the engaging element 7 and the receiving element 4 fit together, and the engaging element 7 The pushing up force is always applied in the vertical direction through the abutment between the top 7a and the peak 3a of the V-shaped groove 3, so when the tone arm 1 is raised, there is no lateral pressure or wobbling on the stylus tip. It can move vertically up and down in that position.

FIG. 2 shows another embodiment of the present invention, which is applied to a linear tracking arm.

That is, the tone arm 1 is moved in parallel by the guide bars 16a and 16b.

Further, in this embodiment, the base end of the arm 60 is connected to the pin 17.
It is attached so that it can rotate freely and move up and down.
Reference numeral 8 denotes a lift bar for raising and lowering the arm 6.

In the drawings, the same reference numbers as those in FIG. 1 indicate the same parts, and the functions of the receiver 4 and the engaging element 7 are the same as in the embodiment shown in FIG. 1, so a description thereof will be omitted.

In the present invention, as shown diagonally above, the receiver 4 of the V-shaped groove 3 is fixed to the tone arm 1, and the free end of the arm 6 of the elevation mechanism 5, which can be raised and lowered, is engaged with the V-shaped groove 3. Since the engaging element 7 is provided which can be freely mated and the arm 6 is configured to be able to move left and right, even when the receiving element 4 and the engaging element 7 do not match, the engaging element 7 can be moved to the slope of the V-shaped groove 3 by the movement of the arm 6. After sliding, it is fitted with the receiving element 4, and the top part 7a of the engaging element 7 and
After the peak portion 3a of the V-shaped groove 3 comes into contact with the V-shaped groove 3, a pushing force is always applied in the vertical direction.

Therefore, when the tone arm 1 is raised or lowered, it always moves up and down in the vertical direction at that position.

As a result, the following effects can be obtained.

Even if the position of the stylus tip is different, no lateral pressure is applied to the stylus tip when the stylus tip leaves the record, so the stylus tip and the record are not damaged.

As mentioned above, since no lateral pressure is applied to the stylus tip, the tone arm does not slide sideways as it rises.

Therefore, unpleasant sliding noise is not generated.

After the tone arm rises, the stylus can be moved precisely to any position, so when it descends and places the stylus on the record,
No lateral pressure is applied to the needle tip, allowing it to be set accurately in the specified position.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are perspective views showing different embodiments of tone arms to which the elevation device according to the present invention is applied, respectively.
Figure 3 is a perspective view of another embodiment showing the main parts of the above device;
The figure shows an explanatory diagram of the operation of the present invention. DESCRIPTION OF SYMBOLS 1...Tone arm, 3...V-shaped groove, 4...Receiver, 5...Elevation mechanism section, 6...Arm,
7... Yaiko.

Claims (1)

[Scope of utility model registration request] A V-shaped groove receiver is fixed to the tone arm, and a retainer that can freely engage with the V-shaped groove is provided at the free end of the arm of the elevation mechanism that can be raised and lowered, and the arm is configured to be able to move left and right. Tone arm elevation device.