JPS5914945Y2 - Tone arm armrest mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an armrest mechanism of a tone arm.

Conventionally, when a record player is not in use, a tone arm is mounted on an armrest, and the arm is further fixed by an arm clamper.

This arm clamper is provided on the armrest, and usually has a U-shape or a U-shape.

However, the U-shaped one has the disadvantage that it requires a large number of parts and requires a large number of assembly steps.

Moreover, the U-shaped one has the disadvantage that the arm easily comes off the rest.

And there is a possibility that the arm pipes of both will be damaged.

Also, even when the arm clamper is not activated,
Zero balance adjustment cannot be performed for both.

This invention focuses on the points mentioned above, and allows the arm to be reliably clamped simply by rotating the armrest. It also allows for zero balance adjustment even when the arm is placed on it, and also prevents damage to the arm pipe. This is an attempt to provide an armrest mechanism for the tone arm that prevents it from sticking.

Hereinafter, an embodiment will be explained with reference to the drawings. Fig. 1 shows the armrest, in which a rest part 2 having a recessed part 2a on which an arm can be placed is formed on the upper part of a shaft 1 which is rotatable with respect to a record player. Further, on both outer sides of the rest part 2, clamp parts 3, 3' are formed at positions extending inward in parallel to the groove direction of the recess 2a and in opposite directions.

The inner curvature of the upper bent portion of the clamp portions 3, 3' is made to approximately match the curvature of the arm, and the tip thereof is extended in the horizontal direction.

According to the structure shown in Fig. 1, as shown in Fig. 2, if arm A is rotated in a direction perpendicular to arm A, arm A will be in a free state, so zero balance adjustment can be performed in this state. You will be able to do this.

At this time, the four parts 2a of the rest part 2 function as escapes for adjustment.

Then, if you rotate it counterclockwise as shown in Figure 3,
The recess 2a is perpendicular to the arm A, so that the arm A straddles the recess 2a, and the clamp parts 3, 3
' will push the arm A in a crosswise manner, and as a result, the arm A will be reliably clamped to the rest part 2 without any risk of damage.

In FIG. 1, the clamp parts 3 and 3' are made to have the same shape so that they face each other in different states, but one clamp part 3' located on the turntable side is oriented in the lateral direction of the arm A. It is also possible to have only a rising portion (indicated by a phantom line) that can prevent movement.

In this way, it becomes easy to move the arm A toward the turntable from the state shown in FIG.

Further, if the rest part 2 is made flat without the recessed part 2a, it becomes difficult to perform zero balance adjustment, but the armrest can be rotated smoothly.

By the way, some record players have a mechanism in which the start switch is independent, or a mechanism in which the start switch is turned on when the arm is moved over the record, especially in return players. In order to employ a structure that rotates the mechanism, this rotational operation can be linked to the start switch.

Therefore, as shown in Fig. 4, the axis 1 of the armrest mechanism
A switch operating plate 5 is fixed to the lower end of the shaft 1 at the lower part of the bearing 4 relative to the panel B, and a cam surface 5a is formed at the tip of the switch operating plate 5. When the cam surface 5a contacts and separates, the switch is activated. Turn C on and off.

In addition, 6 is a retaining member for the armrest mechanism, and 7 is a bearing 4.
This is the mounting nut.

This can be done by making the cam surface 5a of the switch operating plate 5 push the contact point of the switch C when the armrest mechanism is in the state shown in FIG. 2, and released when the armrest mechanism is in the state shown in FIG.

As a result, the start switch is turned on and off at the same time as the arm A is attached and detached from the armrest mechanism.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the armrest mechanism, and FIG. 2A is a perspective view of the armrest mechanism. Fig. 3A and Fig. 5 are explanatory views of the operation, and Fig. 4 is a mechanical diagram in the case of interlocking with the start switch. A...Arm, B...Panel, C...
...Switch, 1...Axis, 2...
Rest part, 3, 3'... Clamp part, 4...
...Bearing, 5...Switch operating plate.

Claims (1)

[Scope of utility model registration request] A rest part is formed on the upper part of the shaft that is rotatable with respect to the panel, and clamp parts facing each other are formed on both outer sides of the rest part, and at least one of the clamp parts is bent inside the tip part. The armrest mechanism of the tone arm.