JPS5916973Y2 - Tone arm weight balancer shaft support mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a tone arm weight balancer shaft support mechanism.

Conventionally, a part of the tone arm shaft was connected with an elastic body to divide the equivalent mass, and damping of bass resonance, which is difficult to achieve with a general arm, was achieved.

FIG. 1 shows a conventional example of this type of apparatus, in which an arm 1 is fixed to a holder 2, and the holder 2 is attached to rotary shafts 3, 3' so as to be rotatable vertically and horizontally.

A weight balancer shaft 4 is connected to a damper 5 at the rear of the holder 2.
, 5' by screws 6, and further a weight balancer 7 is attached to the weight balancer shaft 4.

However, in the above mechanism, the screwed part via the damper 5°5' cannot obtain sufficient equivalent compliance because the screw 6 is a rigid body, and as a result, the division of equivalent mass is incomplete, resulting in low frequency resonance. The braking was insufficient.

In contrast, there is a device disclosed in Japanese Utility Model Application Publication No. 51-154504, but this device has a large number of parts and is difficult to adjust, resulting in manufacturing difficulties.

Therefore, in the present invention, when vibration is applied to the pickup system, if the coupling member between the holder and the weight balancer shaft moves against the vibration, the vibration can be absorbed by the contact resistance. Therefore, the head of the coupling screw used as the coupling member was shaped into a spherical shape to adopt the universal join method.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 2, arm 11. Holder 12, rotating shaft 1
The relationships such as 3 and 13' are the same as in the conventional example shown in FIG.

The coupling portion 18 is composed of a flanged adjustment support member 19° 19', a damper 20 made of an elastic material such as butyl rubber, and a coupling screw 21. The adjustment support member 19 is fixed to the holder 12 with a set screw 22, and the coupling A cylindrical inner hole 23 into which the spherical head 31 of the screw 21 is inserted is provided, and a spherical recess corresponding to the spherical shape 31 is provided at the joint between the through hole of the coupling screw 21 provided in the brim-shaped disk and the inner hole 23. 31' is formed.

Therefore, the spherical screw head 31 and the spherical recess 31' form a universal joint and are rotatable in any direction.

The other adjustment support member 19', which is fixed to the weight balancer shaft 14 by a set screw 22', is provided with a hole 24 for inserting a leg portion of the coupling screw 21.

The coupling screw 21 is connected to the through hole 23 and the hole 24 through the damper 20.
to connect both adjustment support members 19 and 19',
The tip is screwed into the adjustment nut 25.

Note that 14' is a weight balancer adjustment shaft, and the weight balancer 17 is fixed with a screw 17'.

FIG. 3 is an enlarged view showing the state of the connecting portion 18 formed by the connecting screw 21. As shown in FIG.

Now, in the above configuration, when the vibration from the tone arm is transmitted to the coupling part 18, the inner hole 23 of the adjustment member 19
Since the spherical recess 31' provided in the spherical recess 31' and the spherical head 31 of the coupling screw 21 form a universal joint, the vibration is suppressed by the contact resistance between the two, and is finally absorbed by the damper 20. The Rukoto.

Therefore, desired equivalent compliance can be obtained by the coupling portion 18, and resonance can be damped by dividing the equivalent mass.

In addition, by adjusting the nut 25 in Fig. 2, the damper 2
The pressing force relative to 0 changes, and the resonance frequency can be varied.

As mentioned above, the weight balancer shaft support mechanism according to the present invention employs a universal joint connection method for the joint that connects the arm holder and the weight balancer shaft via the damper, so that low-pitched resonance can be achieved against any type of vibration. It is now possible to perform braking, which has a great effect.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an example of a conventional weight balancer shaft support mechanism, FIG. 2 is an explanatory diagram of a weight balancer shaft support mechanism according to the present invention, and FIG. 3 is an enlarged explanatory diagram of a coupling screw connection part. 1.11...Arm, 2,12...Holder 3゜3', 13.13'...Rotation axis, 4,14...Weight balancer axis, 5.5'
, 20...damper, 6,21...
Connection screw, 7, 17... Weight balancer, 1
4'・・・Weight balancer adjustment axis, 19.19
'...Adjustment support member, 25...Adjustment nut, 31...Screw head, 31'...
Spherical depression.

Claims (1)

[Scope of utility model registration request] A flanged adjustment support member is provided on the arm holder and the weight balancer shaft so as to face each other via a damper, a spherical recess is formed in the inner hole of the holder side adjustment support member, and a spherical head coupling screw is provided that corresponds to the recess. A weight balancer shaft support mechanism for a tone arm of a universal joint type, characterized in that: is provided through the adjustment support member and the damper, and the coupling screw is provided with a nut for adjusting the damper pressing force.