JPH0728604Y2 - Disc clamp mechanism - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc clamp mechanism, and more particularly to a disc clamp mechanism configured to attach a clamper to a mounting hole of a clamp arm.

2. Description of the Related Art A conventional disk clamp mechanism for clamping a compact disk on a turntable has a clamper 15 in a circular mounting hole 14 on the tip side of a clamp arm 13 as shown in FIG.
Is rotatably fitted and the clamp arm 13 has an arrow A
When rotated in the direction, the clamper 14 presses the center of the disk 11 against the turntable 12. Further, when the clamp arm 13 rotates in the direction of arrow B, the clamper 15 moves upward, and the clamp of the disk 11 is released. Disc clamper 15
Is, for example, a resin-molded product having a flange protruding from the upper edge and the lower edge of the outer peripheral surface of the disk-shaped main unit, and the clamp arm 13 has the peripheral portion 16 of the mounting hole 14 at the upper edge of the clamper 15. It rotates in the directions of arrows A and B while being brought into contact with the locking portion 17 that overhangs. Therefore, the clamper 15 was tilted as the clamp arm 13 was rotated.

However, in the conventional disc clamp mechanism, when the disc 11 is not clamped as shown in FIG. 5, the clamper 15 has its upper engaging portion 17 in the mounting hole of the clamp arm 13.
Since it is in contact with the peripheral portion 16 of the clamp arm 14 and is inclined with the rotation angle of the clamp arm 13, the bottom surface portion 18 of the clamper 17 in the rotation center direction of the clamp arm 13 is separated from the clamp arm 13 by a distance d _5. Is going down and therefore the disc
In order to prevent the contact with 11, the rotation angle of the clamp arm 13 needs to be set large, which causes a problem that the thickness of the disc clamp mechanism becomes thick.

The present invention has been made in view of the above points, and an object of the present invention is to provide a thin disk clamp mechanism that can stably clamp a disk.

According to the present invention, a clamper is rotatably mounted in a mounting hole formed at a tip of a clamp arm, and the clamp arm presses a disk against a turntable by rotating the clamp arm. In a disc clamp mechanism for clamping a disc, an opening provided at the tip of the clamp arm in communication with the mounting hole, and both side ends of which form a support shaft for rotatably supporting the clamper; and the clamp arm. When the disc is rotated in a direction to release the clamp, the tip of the clamp arm engages with the upper end of the clamper, and the clamper is rotated about both side ends of the opening as a support shaft to move the clamper to the disc. And a claw portion which is parallel to the.

According to the present invention, when the clamp arm rotates in the disc direction, the clamper presses the disc against the turntable to clamp the disc. Further, when the clamp arm rotates in the direction to release the clamp of the disc, the protruding portion of the clamper comes into contact with the claw portion. The claw portion is provided in the direction of the tip of the clamp arm and restricts the upward movement of the clamper. When the clamp arm further rotates from this state, the clamper is supported and rotated by both end portions of the opening provided at the tip portion of the clamp arm, and can be made parallel to the disc.

Since the clamper can be parallel to the disc, the part of the clamp arm that moves less in the direction of rotation center can be separated from the disc at the same time as the part that moves much in the outer peripheral direction. Since a sufficient distance can be secured between the clamper and the disk even when the disk clamp mechanism is relatively small, the moving distance of the clamper can be reduced by the smaller rotation angle of the clamp arm, and the disk clamp mechanism can be made thinner.

Further, since the clamper is supported by both end portions of the opening provided at the tip end portion of the clamp arm, it can be stably rotated, and thus stable clamping and unclamping can be realized.

Furthermore, since the clamper is supported at both ends of the opening at the tip of the clamp arm in the unclamped state, the clamp arm does not project upward from the upper surface of the clamper, so that the clamper can be made thin.

Embodiment FIG. 1 shows an exploded perspective view of an embodiment of a disc clamp mechanism according to the present invention. In the figure, 2e indicates a claw portion, and 6a indicates a collar portion which is a projecting portion which abuts on the claw portion 2e and horizontally holds the clamper.

In the figure, a clamp arm 1 is rotatably supported by a shaft 3 supported by bearings 2a and 2b of a top plate 2. A circular mounting hole 4 is formed at the tip of the clamp arm 1, and an opening 5 communicating with the mounting hole 4 is provided at the tip 1a of the clamp arm 1. A claw portion 2e is integrally formed on the top plate 2 in the direction of the tip of the clamp arm 1.

A clamper 6 is mounted so as to be loosely fitted in the mounting hole 4 of the clamp arm 1. No. 4 inside the clamper 6
As shown in the figure, an annular magnet 7 and a thin plate-shaped magnet yoke (made of iron) 8 are housed.

The clamp arm 1 is biased counterclockwise by the pressing force of the coil spring 9 wound around the upright portion 2c of the top plate 2.
The disc tray 10 shown in FIG. 1 moves in the direction of arrow D. When the disc tray 10 is housed in the apparatus and the disc 11 placed on the disc tray 10 arrives above the turntable 12, an elevating mechanism (not shown) of the clamp arm 1 operates. As a result, the clamp arm 1 rotates counterclockwise by the pressing force of the spring 9 and the operation of the elevating mechanism, and the clamper 6 descends into the opening 2d of the top plate 2. As the clamper 6 descends in this manner, the disk 11 is pressed by the clamper 6 and placed on the turntable 12.

An iron annular plate (not shown) is provided on the upper surface of the turntable 12.
, The disk 11 is clamped on the turntable 12 by the magnetic force of the magnet 7 in the clamper 6.

As shown in FIG. 4, the clamper 6 has an annular flange 6a, which is a projecting portion, on the outer periphery of the upper portion, and a projecting piece 6b that is divided and projects on the outer periphery of the lower portion. Recessed portion provided inside the clamper 6
An annular magnet 7 and a magnet yoke 8 are inserted into 6d so as to be fitted therein, and are held by a locking claw 6c. The outer diameter dimension d ₁ of the intermediate portion 6e of the clamper 6 is smaller than the inner diameter dimension d ₂ of the mounting hole 4 of the clamper arm 1, and the clamper 6 is loosely fitted in the mounting hole 4. Further, the collar portion 6a of the clamper 6
And the outer diameters d ₃ and d ₄ of the protruding piece 6b are the inner diameter d _{2 of the} mounting hole 4.
The flange portion 6a has a diameter larger than that of the clamp arm 1 so as to project from the tip end portion of the clamp arm 1 and come into contact with the claw portion 2e provided on the top plate 2. The clamper 6 is prevented from coming off from the clamp arm 1 by the upper and lower flange portions 6a and the protruding pieces 6b.

The projecting pieces 6b projecting to the outer periphery of the lower portion of the clamp 6 respectively project in a fan shape, and are formed in the same size and shape. The width dimension l ₁ of the protruding piece 6b is formed smaller than the opening width dimension l ₁ (shown in FIG. 1) of the opening 5 provided at the tip peripheral edge of the clamp arm 1.

Next, the movement of the clamper 6 shown in FIG. It will be described together with FIG.

First, when the clamp arm 1 rotates about the shaft 3 in the direction of arrow A, the clamper 6 moves downward,
As shown in the figure, the disk 11 is held between the turntable 12 and the clamper 6. At this time, the magnet 7 contained in the clamper 6 causes the turntable 12 and the clamper 6 to
And attract each other to clamp the disk 11. At this time, the clamp arm 1 descends sufficiently downward and stops in a state where the clamper 6 and the clamp arm 1 are not engaged with each other.

To release the clamp, the clamp arm 1 is rotated around the shaft 3 in the direction of arrow B. Clamp arm 1
Is rotated in the direction of arrow B, the mounting hole 5 of the clamp arm 1
The peripheral portion of the contact portion comes into contact with the collar portion 6a of the clamper 6 and presses the clamper 6 in the direction of arrow B. When the clamper 6 is pressed in the direction of the arrow B, the clamper 6 separates from the disc 11 and the clamper 6
Starts moving upwards. Further, when the clamp arm 1 is rotated in the direction of the arrow B, the flange portion 6a of the clamper 6 is moved to the top plate 2
It comes into contact with the claw portion 2e provided integrally with the. After the collar portion 6a of the clamper 6 contacts the claw portion 2e, the clamp arm 1
When is rotated in the direction of arrow B, the upward movement of the flange 6a of the clamper 6 at the tip of the clamp arm 1 is restricted. The opening 5 of the clamp arm 1 is provided with a collar 6a of the clamper 6.
Therefore, the clamper 6 is rotated in the direction of the arrow C with the tip 1a of the opening 5 of the clamp arm 1 as a support shaft and is horizontal with respect to the disk 11 as shown in FIG. Becomes At this time, the mounting hole 4 of the clamp arm 1
Of the shaft 3 is in contact with a protruding piece provided on the bottom surface of the clamper 6, and the bottom surface of the clamper 6 does not lower downward. Therefore, the rotation angle of the clamp arm 1 is reduced accordingly. Does not interfere with the insertion of the disk 11.

Therefore, the disc clamp mechanism itself can be made thin. When the clamp is released, the clamper 6 is supported by both end portions of the opening 5 communicating with the mounting hole 4 at the tip of the clamp arm 1 and is parallel to the disc, so that the clamper 6 can be stably rotated. This enables stable clamp operation.

Further, the clamper 6 is supported by both side ends of the opening 5 formed in the tip end portion of the clamp arm 1, and even when the clamp arm 1 is rotated upward, the tip end portion of the clamp arm 1 is above the upper surface of the clamper 6. Does not project into
Therefore, it is possible to make the device thinner.

Effect of the Invention As described above, according to the present invention, when the clamp arm rotates in the direction to release the clamp of the disk, the protrusion provided on the clamper abuts the claw portion, and the tip end of the clamp arm supports the spindle. Since the clamper can be made parallel to the disc by rotating the clamper, a portion of the clamper, which has a small movement in the rotation center direction, can be separated from the disc at the same time as a portion having a large movement in the outer peripheral direction. Therefore, even if the rotation angle of the clamp arm is relatively small, a sufficient distance can be secured between the clamper and the disc. Therefore, the movement distance of the clamper can be reduced by the smaller rotation angle of the clamp arm. It has features such as a thin disk clamp mechanism.

Further, since the clamper is supported at both side ends of the opening provided at the tip portion of the clamp arm, it has a feature that it can be stably rotated, and therefore stable clamping and unclamping can be realized.

Further, since the clamper is supported at both ends of the opening at the tip of the clamp arm in a unclamped state, the clamp arm does not project upward from the upper surface of the clamper, and thus the clamper can be further thinned.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 and FIG.
FIG. 4 is a diagram for explaining the operation of one embodiment of the present invention,
FIG. 5 is a sectional view of an essential part of an embodiment of the present invention, and FIG. 5 is a sectional view of a conventional example. 1 ... Clamp arm, 2 ... Top plate, 2e ... Claw part, 6 ...
… Clamper, 6a… Trim part, 11 …… Disk, 12 …… Turntable.

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Claims (1)

[Scope of utility model registration request] 1. A disc for clamping the disc by rotatably mounting a clamper in a mounting hole formed at the tip of the clamp arm and rotating the clamp arm to press the disc against a turntable. In the clamp mechanism, an opening is provided at the tip of the clamp arm so as to communicate with the mounting hole, and both ends of the opening form a support shaft for rotatably supporting the clamper; and the clamp arm clamps the disc. When the clamp arm is rotated in the direction of releasing, the clamp arm tip is engaged with the upper end of the clamper, and the clamper is rotated about both side ends of the opening as a support shaft to make the clamper parallel to the disc. A disc clamp mechanism including a claw portion.