JPH079309Y2 - Contact - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a contactor for grounding static electricity from the cylinder of a video tape recorder (VTR).

(Prior Art) In order to ground the static electricity from the high-speed rotating cylinder of the VTR, a carbon or silver contact 2 is press-fitted into the hole provided at the tip of the leaf spring 1 from below as shown in FIG. The contactor having the vibrating rubber plate 4 attached to the leaf spring 1 is pressed against the end surface of the shaft 3 of the cylinder which rotates as shown by the arrow, and the spherical contact point 2a and the flat end surface of the shaft 3 are slid. The method of dynamic contact is adopted.

(Problems to be solved by the invention) However, as shown in FIG. 4, the center of the contact point 2a is closer to the rotation direction side than the center of the end face of the shaft 3 (in the case of clockwise rotation, the center of the shaft end of the shaft is). If it is mounted so that it touches (on the right side), chattering may cause abnormal noises such as piercing and queuing. When abnormal noise occurs, the screen is disturbed, which has a fatal adverse effect on the VTR.

In order to prevent the generation of abnormal noise, thicken the rubber plate 4 for the purpose of absorbing the vibration when chattering occurs, and for suppressing the vibration, as shown in FIG. A method of folding back like 1a is taken, but it is still insufficient. It is possible to prevent the generation of abnormal noise by mounting so that the center of the contact point is in contact with the center of the shaft end on the side opposite to the rotation direction (on the left side of the center of the shaft end in the case of clockwise rotation). In production, and in mounting in a narrow space, it is extremely difficult to make the mounting position accurate.

An object of the present invention is to provide a contactor used for electrostatic grounding of a VTR having a structure in which, even if chattering occurs, the chattering does not progress abnormally.

(Means for Solving the Problem) In the present invention, in a contactor which is used by pressing a contact portion against the end surface of a rotating shaft, the contact is press-fitted into a hole provided at the tip of the leaf spring, and a part of the leaf spring is used. The present invention relates to a ground contactor for a VTR, in which a vibration-proof material that is continuous with a projection of a contact and a leaf spring that projects on the upper surface is attached and the projection is pressed by the reaction force of the vibration-proof material.

The protrusion of the press-fitted part of the contact point on the upper surface of the leaf spring is that the vibration-proof material rides on this projection part to apply a reaction force to the vibration-proof material and press the contact point to ensure vibration-proofing from the contact point. This is to inform the material. The vibration isolator is not particularly limited, but rubber is usually used. The anti-vibration material is attached with an adhesive or the like so as to cover the leaf spring and the press-fitted portion of the contact protruding from the top surface of the leaf spring. Apply a reaction force to the leaf spring. The leaf spring is not particularly limited as long as it has conductivity and spring properties such as phosphor bronze and beryllium copper. The contacts are made of carbon,
A conductive material such as silver and having excellent corrosion resistance is preferable.

(Embodiment 1) As shown in FIG. 1, the press-fitting portion 2b of the carbon contact 2 is press-fitted into the hole provided at the tip of the phosphor bronze leaf spring 1 from below to project it onto the upper surface of the leaf spring 1. Then, a piece of rubber plate 8 of neoprene rubber was attached to the upper part of the press-fitting portion 2b and the leaf spring 1 with an adhesive.

Comparative Example 1 After the carbon contact 2 was fixed to the tip of the phosphor bronze leaf spring 1 in the same manner as in Example 1, the press-fitting portion was formed as shown in FIG.
A conductive adhesive was applied to the holes 2b and the holes of the leaf spring 1. Next, a rubber plate 6 made of neoprene rubber is attached to the leaf spring 1 with an adhesive, and the press-fitting portion 2b is covered with silicone rubber 5,
The silicone rubber 5 was brought into contact with the rubber plate 6.

Comparative Example 2 After the carbon contact point 2 was fixed to the tip of the phosphor bronze leaf spring 1 in the same manner as in Example 1, the rubber plate 7 of neoprene rubber was used.
Cut the tip of the V-shape as shown in Fig. 2 (a),
As shown in FIGS. 2 (b) and 2 (c), the press-fitting portion 2b is sandwiched by the leaf springs from both sides, and the leaf springs 7 are attached by an adhesive.
Was attached to the tip of the spring plate 1.

Comparative Example 3 After the carbon contact 2 was fixed to the tip of the phosphor bronze leaf spring 1 in the same manner as in Example 1, a neoprene rubber plate 4 was adhesively attached to the leaf spring 1 as shown in FIG. I stuck it on.

Comparative Example 4 As shown in FIG. 6, by punching out, the tip of the leaf spring 1 is cut and raised downward to provide claws 9a and 9b, and the upper portion of the contact 2 is fitted into the hole 10 formed by cutting and raising. Then, the side surface of the contact upper part is sandwiched by the claws 9a and 9b, and the gap between the side surface of the contact upper part of the hole 10 and the claw is filled with a conductive adhesive so that the upper surface of the contact 2 is flush with the upper surface of the leaf spring 1. Fixed so that Next, a piece of neoprene rubber plate 11 was fixed on the upper part of the contact and on the plate spring 1 with an adhesive.

The contacts obtained in the examples and comparative examples were attached to the end surface of the cylinder shaft of a VTR where chattering is likely to occur, and a reproduction test was conducted by rotating the shaft, and a contact test of example 1 was performed. When used, no abnormal noise was generated, and when the contactor of Comparative Example 3 was used, the abnormal noise was the maximum, and when the contactors of Comparative Example 1, Comparative Example 2 and Comparative Example 4 were used, Comparative Example Although it was reduced to 10% or less of the case of 3, it was not possible to eliminate all abnormal noise.

(Effect of the Invention) According to the present invention, it is possible to reliably prevent abnormal noise when the contactor slides on the end surface of the cylinder shaft for use.

[Brief description of drawings]

FIG. 1 is a front view of a contact according to an embodiment of the present invention, FIGS. 2 (c), 3 and 6 are front views of a contact of a comparative example,
2 (a) and 2 (b) are a plan view and a side view of FIG. 2 (c), FIG. 4 is a front view illustrating a conventional contactor and its use state, and FIG. It is a front view of a contactor. Explanation of symbols 1 ... Leaf spring, 2 ... Contact point 2b ... Press-fitting part, 3 ... Shaft 4 ... Rubber plate, 5 ... Silicon rubber 6,7,8 ... Rubber plate, 9a, 9b ... Claw 10 ... hole, 11 ... rubber plate

Claims (1)

[Scope of utility model registration request] 1. A contact, which is used by pressing a contact portion against an end surface of a rotating shaft, is press-fitted into a hole provided at a tip of a leaf spring, and a part of the protruding portion of the contact protrudes on an upper surface of the leaf spring. And a grounding contact for a video tape recorder, in which a continuous vibration isolator is attached to the leaf spring and the protruding portion is pressed by the reaction force of the vibration isolator.