JP2669984B2 - Damper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device for rotating a rotating member.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional damper device in a magnetic recording / reproducing apparatus using a cassette tape. The base end of the rotating member (3) having a cassette holder (not shown) is rotatably arranged between the two supporting members (2) (only one supporting member is shown in the drawing), and the rotating member (3) is rotated. Support shaft for member (3)
A sector gear (7) is provided at (21), and a damper device (6) is engaged with the gear (7).

The damper device (6) is a case containing oil.
Insert the blade (63) of the rotor (62) into (61), and
The gear (66) meshing with the sector gear is attached to the projecting portion with the (64) projecting from the shaft hole (60) of the case (61).

The rotating member (3) is constantly urged in the upward rotation direction by a spring (not shown). Insert the cassette into the cassette holder on the rotating member (3), and press the rotating member (3) by hand against the spring force to automatically lock it in the lowered position. Including rotating member
(3) automatically rotates up to its original position by the spring force.

In the damper device (6), when the rotating member (3) is rotated upward by the spring force, the resistance of the oil and the rotor (62) causes the rotating member (3) to rotate regardless of the presence or absence of the cassette. The rising rotation speed can be made substantially constant.

[0006]

The conventional damper device described above has a complicated structure, a large overall thickness, and a heavy weight, which is disadvantageous in reducing the size and weight of the mechanism of the magnetic recording / reproducing device. The present invention clarifies a damper device that can contribute to reduction in size and weight of a mechanism of a magnetic recording / reproducing device.

[0007]

A damper device of the present invention is a substrate
(1) Support member (2) between the upper support member (2) and (2)
A damper device for reducing a rotation speed with respect to a rotation member (3) pivotably supported by a pivot member and urged by a spring in a direction in which a free end thereof rises, comprising: a support member (2); Rotating member (3)
A rotatable member (5) is rotatably supported by the support member (2) at a position deviated from the rotation center of the rotating member (3) between
The rotating body (5) or the rotating member (3) is provided with a protrusion (52), and the other is provided with a guide portion (33) for slidably guiding the protruding body (52). An oil (8) is provided between the support member (2) and the support member (2) so as to resist rotation of the rotating body (5).

[0008]

When the rotating member (3) in the lowered position is rotated upward by the spring force, the rotating body (5) engaged with the rotating member receives the rotating force. Oil is interposed between the rotating body (5) and the support member (2), and the viscosity of the oil causes resistance to the rotation of the rotating body (5), and thus reduces the rotation of the rotating member (3). Can be made.

The rotating body (5) of the damper device is plate-shaped, and the rotating body (5) is disposed between the rotating member (3) and the supporting member (2) to form the rotating body (5). Since only oil is interposed between the support member (2) and the conventional damper device, the structure can be simplified and the thickness can be greatly reduced.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a state in which the present invention is attached to an elevating mechanism of a cassette holder for supporting a cassette tape of a video tape recorder or a tape recorder. substrate
A pair of support members (2) and (2) are screwed and fixed on (1),
A rotating member (3) is rotatably arranged between the support members (2) and (2).

The turning member (3) is formed by bending downward side walls (32) and (32) at both ends of a rectangular frame (31), and has shaft holes (35) opened at one end of each side wall (32). A support shaft (21) protruding inwardly is fitted in the support member (2) so as to freely rotate.

A cassette holder (4) for accommodating a cassette tape is slidably arranged on the rotating member (3). The rotating member (3) is urged by a torsion spring (not shown) in a direction in which the free end rises and rotates, and the rotating angle is regulated by a stopper provided at an appropriate position.

When the rotating member (3) is locked by locking means (not shown) at the lowered position of the rotating member (3) shown in FIG. 4, the lock is achieved by pressing an eject button (not shown). Is released, and the rotating member (3) including the cassette holder (4) rotates upward around the support shaft (21) by the spring force.

A damper device is provided between the one supporting member (2) and the rotating member (3). The damper device is a support member.
A disc-shaped rotating body (5) is rotatably attached to (2) at a position slightly deviated from the center of rotation of the rotating member (3).

The support member (2) has a shaft hole (23) slightly opener than the support shaft (21) from the free end of the rotating member (3), and projects from the center of the rotating body (5). Install the supporting shaft (51) into the shaft hole (2
It is rotatably fitted in 3).

Oil of high viscosity is interposed between the rotating body (5) and the supporting member (2). The oil may be the same as the oil used in the conventional oil-filled damper device. A short axial protrusion (52) at one location on the outer peripheral side of the rotating body (5)
Is provided on the rotating member (3) side, and the protrusion (52) is a rotating member.
It is slidably engaged with a guide portion (33) formed on the side wall (32) of (3).

The guide portion (33) of the embodiment is an elongated hole (34) penetrating the side wall (32), and the elongated hole (34) is used when the rotating member (3) rotates. It is opened in such a direction that the protrusion (52) is hooked and the movement of the protrusion is not restricted.

When the rotating member (3) at the lowered position is rotated upward by the spring force, the rotating body (5) engaged with the rotating member receives the rotating force. Oil is interposed between the rotating body (5) and the supporting member (2), and the viscosity of the oil serves as the rotational resistance of the rotating body (5), and therefore the rotational movement of the rotating member (3) is decelerated. .

The rotating body (5) of the damper device is plate-shaped,
Since the rotating body (5) is provided between the rotating member (3) and the supporting member (2) and oil is merely interposed between the rotating body (5) and the supporting member (2), Compared with the conventional damper device, the structure can be simplified and the thickness can be significantly reduced.

The rotating torque of the rotating body (5) and the rotating member (3)
The relationship of the rotation torque of is as follows. Rotating body (5)
Let Q be the rotation torque of Q and T be the rotation torque of the rotation member (3). Q / T = (r ₂ −μ × r ₃ ) / r For example, μ = 0.2, r = 12.3, r ₂ = 1.25 , R ₃ = 3.4 Q / T = 0.05, and the force can be reduced to about 1/20. In implementing the present invention, the same effect as described above can be obtained even if the rotating body (5) is provided with a guide portion and the rotating member (3) is provided with a protrusion that slidably engages with the guide portion. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a support portion of a rotating member.

FIG. 2 is an assembling perspective view of a support portion of the rotating member.

FIG. 3 is a side view showing a state where a rotating member is raised.

FIG. 4 is a side view of a state where the rotating member is lowered.

FIG. 5 is an exploded view of the damper device.

FIG. 6 is a cross-sectional view of the damper device.

FIG. 7 is a perspective view of a conventional example in an attached state.

FIG. 8 is a sectional view of a conventional damper device.

[Explanation of symbols]

 (1) Substrate (2) Supporting member (3) Rotating member (5) Rotating body (33) Guide part (52) Lever (8) Oil

Claims (1)

(57) [Claims] 1. A support member (2) on a substrate (1), which is rotatably provided with a base end side pivotally supported by the support member (2) and a spring is provided in a direction in which a free end rises. A damper device for reducing the rotation speed with respect to a biased rotation member (3), comprising: a support member
A rotating member (5) is rotatably supported by the support member (2) at a position deviated from the rotation center of the rotating member (3) between the (2) and the rotating member (3), One of the rotating body (5) and the rotating member (3) is provided with a protrusion (52), and the other is provided with a guide portion (33) for slidably guiding the protrusion (52). A damper device in which an oil (8), which is a resistance to the rotation of the rotating body (5), is interposed between the support member (2) and the support member (5).