JPH08277871A - Damper mechanism - Google Patents

Abstract

PURPOSE: To provide damper mechanism smooth in torque change, without the fear of equipment pollusion. CONSTITUTION: A friction plate 5 is rotatably enclosed in an upper housing 1. Friction material 3 is rigidly fixed to the inner surface of a lower housing 2. The friction plate 5 is brought into pressure contact with the friction material 3 by a spring 8 disposed in the upper housing 1 while rotating the friction plate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper mechanism, and more particularly to a damper mechanism for smoothly performing opening / closing operations of an opening / closing lid of a cassette tape recorder and inserting / removing operations of a disc set tray of a compact disc player.

[0002]

Prior Art and Problems to be Solved by the Invention FIG.
In a small electronic device such as a cassette tape recorder or a compact disc player shown in FIG. 1, silicone oil is contained in an oil chamber as a damper mechanism for smoothly opening and closing the lid 11 and moving the lid in and out. There is a method in which a disc- or vane-shaped resistance plate is installed in and a damping effect is obtained by viscous resistance when the silicone oil is agitated by the resistance plate during opening / closing operation.

There is also a method of obtaining a damping effect by viscous resistance when pressure is applied to the silicone oil in the oil chamber by the resistance plate at the time of opening / closing operation to pass through the orifice.

However, the above-mentioned method utilizing the viscosity of oil has a drawback that the oil enclosed in the oil chamber easily leaks. For this reason, the rotation torque rapidly changes, and the air corresponding to the leaked oil enters the oil chamber, and when the air is mixed into the oil, it becomes cloudy, the viscous resistance of the oil changes, and the rotation torque Has the drawback of changing.

Further, there is a drawback that the periphery of the device is contaminated due to the leakage of oil. Further, the damper mechanism of the type that agitates oil has a drawback that the force (torque) required for opening and closing during the opening and closing operation changes abruptly depending on the opening and closing angle due to the weight of the lid.

Further, there is a drawback in that the viscosity of the oil changes with a change in temperature, and the torque required for the opening / closing operation also changes irregularly.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a damper mechanism in which the torque change is smooth and there is no risk of equipment contamination. is there.

[0008]

In order to achieve the above object, the present invention comprises a housing in which a friction plate is rotatably housed, a friction material is fixed to one inner surface of the housing, and the friction plate is rotated. In the first invention, the damper mechanism is characterized in that the friction plate is pressed against the friction material by a spring arranged in the housing while the friction plate and the friction material are circular. A damper mechanism is a second invention, and in the above first invention, a damper mechanism in which the friction plate and the friction material are both elliptical is the third invention. In the above first invention, the friction plate is a fan-shaped friction. The material is circular, the radius of the fan is larger than the radius of the circle but smaller than the diameter of the circle, and the center of rotation of the friction plate is eccentric with respect to the center of the friction material by a length approximately corresponding to this radius difference. That The damper mechanism according to symptoms and the fourth invention.

[0009]

[Function] Since the friction plate is pressed against the friction material while being buffered by the spring force of the spring, the friction resistance is reduced,
Rotational torque changes smoothly.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the upper housing 1 and the lower housing 2 are fitted and fixed, and the friction material 3 is fixed to the lower housing 2.
It is fixed to the inner surface with an adhesive or a double-sided adhesive sheet 4. The friction plate 5 is housed in the upper housing 1, and the input shaft 6 protruding from the friction plate 5 is rotatably attached to the upper housing 1.
And an input gear 7 is fitted to the end of the input shaft 6. Further, the friction plate 5 is pressed against the friction material 3 by the spring 8 arranged in the upper housing 1.

In the damper mechanism constructed as described above, when the input gear 7 rotates due to the operation of the gear or the rack (not shown) that meshes with the input gear 7, the friction plate 5 rotates and comes into pressure contact with the friction material 3. Since the pressure contact force is buffered by the spring force of the spring 8, the rotational torque changes smoothly. 2 to 4 described below are views showing modified examples of the friction plate and the friction material.

As shown in FIG. 2, if the friction plate 5a and the friction material 3a are circular, the pressure contact area between the friction plate 5a and the friction material 3a (average diameter of the friction material) during one rotation of the friction plate 5a. Does not change, the generated torque does not change, and exhibits a straight line as shown by a straight line A in FIG.

Further, as shown in FIG. 3, if the friction plate 5b and the friction material 3b are elliptical, the pressure contact area between the friction plate 5b and the friction material 3b (the friction material Since the average diameter = shown by the one-dot chain line in FIG. 3B) changes, the generated torque also changes, and as shown by the curve B in FIG.
The peak will occur once.

Further, as shown in FIG. 4, the friction plate 5c has a sector shape, the friction material 3c has a circular shape, and the radius of the sector shape is about 1.5 times the radius of the circle, and the length corresponding to the radius difference is approximately the same. If the center of rotation of the friction plate 5c is eccentric to the center of the circular friction member 3c, the pressure contact area between the friction plate 5c and the friction member 3c during one rotation of the friction plate 5c (average diameter of friction member) = (Indicated by the alternate long and short dash line in FIG. 4B) changes,
The generated torque also changes, and one peak occurs as shown by the curve C in FIG.

In each of the above examples, the generated torque T is T = μ
It can be expressed as × R × F. In this equation, μ is the friction coefficient, R is the average diameter of the friction material, and F is the spring force of the spring 8.

[0016]

Since the present invention is configured as described above, it is possible to provide a damper mechanism in which the torque change is smooth and there is no risk of equipment contamination.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a damper mechanism of the present invention.

2 (a) is a side sectional view showing an embodiment of a friction plate and a friction material, and FIG. 2 (b) is a plan view thereof.

FIG. 3 (a) is a side sectional view showing another embodiment of a friction plate and a friction material, and FIG. 3 (b) is a plan view thereof.

FIG. 4 (a) is a side sectional view showing yet another embodiment of a friction plate and a friction material, and FIG. 4 (b) is a plan view thereof.

FIG. 5 is a diagram showing a change in rotational torque when a friction plate is pressed against a friction material and rotated.

FIG. 6 is a perspective view showing a state in which a lid of the cassette tape recorder is opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Upper housing 2 ... Lower housing 3, 3a, 3b, 3c ... Friction material 4 ... Adhesive 5, 5a, 5b, 5c ... Friction plate 6 ... Input shaft 7 ... Input gear 8 ... Spring

Claims (4)

[Claims] 1. A friction plate is rotatably housed in a housing, a friction member is fixed to one inner surface of the housing, and the friction plate is made into a friction member by a spring arranged in the housing while rotating the friction plate. A damper mechanism characterized by a pressure contact structure. 2. The damper mechanism according to claim 1, wherein both the friction plate and the friction material are circular. 3. The damper mechanism according to claim 1, wherein both the friction plate and the friction material are elliptical. 4. The friction plate has a fan shape and the friction material has a circular shape, and the radius of the fan shape is larger than the radius of the circle but smaller than the diameter of the circle, and the center of rotation of the friction plate is substantially equivalent to the radius difference. The damper mechanism according to claim 1, wherein the friction member is eccentric with respect to the center of the friction member.