JPH0544920Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a disk clamping device for compressing and holding a disk on a turntable, and particularly relates to a disk clamping device that utilizes the attractive force generated by a magnet. . (b) Prior Art Optical disc players are known that use optical pickups to reproduce signals recorded on discs. Since this type of disc player needs to rotate the disc at high speed, it is equipped with a disc clamping device for clamping and holding the disc on the turntable. In the disk clamp device, a clamp plate having a chucking member that presses the disk toward the turntable is usually disposed at a position facing the turntable, and is supported so as to be movable between a clamped position and a non-clamped position. The disk is crimped onto the turntable by moving the plate to the clamp position. By the way, as a disk clamp device, as shown in Utility Model Application Publication No. 61-21042, for example, the turntable is made of a magnetic material, and a magnet is attached to the surface of the chucking member facing the turntable. A device is known in which a disk is pressed onto a turntable by the generated suction force. By doing this, the disk can be securely pressed onto the turntable. (c) Problems to be solved by the invention However, the disk clamp device using magnets does not allow the disk to turn when the disk is clamped, that is, when the disk is interposed between the turntable and the chucking member. Since the magnetic force generated by the magnet is set to ensure that the disc is crimped onto the table, the turntable and chucking member are more firmly crimped even when no disk is mounted on the turntable. . Therefore, in this case, even if an operation is performed to displace the clamp plate to the non-clamp position, the chucking member does not easily separate from the turntable, and the operation may not be performed smoothly or the clamp plate may not be driven. A large load is applied to the drive mechanism, which causes the drive mechanism to malfunction. (d) Means for Solving the Problems The present invention is a disk clamping device that has been created in view of the above points, in which one side serves as a pressing surface for pressing the disk disposed between the turntable and the other side serves as a pressing surface for pressing the disk disposed between the turntable and the turntable. A flange piece is formed, and the flange piece is disposed on a different side of the pressing surface with the clamp plate sandwiched between the chucking member, which is loosely fitted into the mounting hole of the clamp plate, and the clamp plate and the chucking member. It is provided with a protrusion formed on a surface of the chucking member facing the collar piece. (E) Function The present invention is designed to tilt the chucking member by generating a contact force on the protrusion when the clamp plate is displaced from the clamping position to the non-clamping position, thereby separating the chucking member from a part of the turntable. It is something. (F) Embodiment FIG. 1 is a partial sectional view showing an embodiment of the present invention, in which 1 is a turntable made of magnetic metal and has a disk 2 mounted thereon, and 3 is a turntable that is made of magnetic metal and has a disk 2 mounted thereon. A clamp plate 4 is mounted on the clamp plate 3 at a position opposite to the turntable 1 and is supported so as to be movable between a clamp position shown in the figure in which it is crimped onto the table 1 and a non-clamp position. This is a chucking member in which a pressing part 5 for pressing the disc 2 on the turntable 1 is formed on the lower side. The pressing portion 5 of the chucking member 4 is composed of a permanent magnet 6 and a mounting member 7 to which the permanent magnet 6 is mounted, and is mounted on a main body portion on which a collar piece 4a is formed. and,
The chucking member 4 is loosely fitted into the mounting hole 3a of the clamp plate 3 by disposing the collar piece 4a on a different side of the pressing portion 5 with the clamp plate 3 interposed therebetween. Further, the clamp plate 3 is made of a synthetic resin material, and as shown in the perspective view of FIG. A portion 8 is formed. The protrusion 8 faces the flange piece 4a of the chucking member 4 and is configured so as not to come into contact with the flange piece 4a when the clamp plate 3 is displaced to the clamp position. FIG. 3 is a partial cross-sectional view from the side of a disc player equipped with the disc clamping device of FIG. A tray 12 is mounted on the chassis 9 and is supported so as to be slidable in the horizontal direction between the attachment/detachment position where the disk 2 is attached/detached by the member 11 and the storage position where the center hole of the disk 2 is located on the turntable 1. This is a spring that applies a clockwise biasing force to the clamp plate 3 that is supported by the upright bearing member 13.
In FIG. 3, the same parts as in FIG. 1 are given the same number. In the disk player shown in FIG. 3, when sliding the tray 10 from the storage position to the attachment/detachment position, the clamp plate 3 is slightly rotated counterclockwise so that the chucking member 4 does not interfere with the sliding movement of the tray 10. After displacing the tray 10 to the unclamped position,
When the sliding movement of the tray 10 is performed, the clamp plate 3 moves toward the guide protrusion 14 formed on the clamp plate 3.
and a guide groove (not shown) formed in the tray 10 so as to be held in the non-clamped position. In a state where the tray 10 shown in FIG. 3 is displaced to the storage position and the clamp plate 3 is displaced to the clamp position, the chucking member 4
The disk 2 is firmly pressed against the turntable 1 by the magnetic force generated from the permanent magnet 6 toward the turntable 1. Therefore, the disk 2 rotates reliably as the turntable 1 rotates. Now, when an operation is performed to displace the tray 10 to the attachment/detachment position, the clamp plate 3 is first moved by the spring 12.
A rotation operation is performed to displace it to the non-clamped position against the urging force of. Then, due to the rotational movement of the clamp plate 3, the protrusion 8 and a part of the peripheral edge of the mounting hole 3a of the clamp plate 3 come into contact with the collar piece 4a of the chucking member 4, so that the permanent magnet 6 generates a The chucking member 4 is separated from the turntable 1 against the magnetic force. In this case, the protrusion 8 is first brought into contact with the flange piece 4a, but the protrusion 8 is moved away from the rotation axis of the clamp plate 3 from a straight line passing through the center of the mounting hole 3a of the clamp plate 3. Since the chucking member 4 is formed at an offset position, the chucking member 4 is tilted by the contact force generated on the flange piece 4a, and as shown in FIG. being separated from. The chucking member 4 has a collar piece 4a.
Therefore, it is supported by the clamp plate 3 at two points: the part where the protrusion 8 abuts and the part closest to the rotation axis of the clamp plate 3, and is displaced as the clamp plate 3 rotates. Eventually, when the rotation operation of the clamp plate 3 to the non-clamp position is completed, the sliding operation of the tray 10 is performed, the tray 10 is displaced to the attachment/detachment position, and the series of operations is completed. By the way, the disk clamp device according to the present invention is particularly effective when the disk is not mounted on the turntable 1, so that the permanent magnet 6 of the chucking member 4 is directly attracted to the turntable 1. That is, as described above, since the permanent magnet 6 is designed to be peeled off from a predetermined portion, the chucking member 4 can be easily and smoothly moved onto the turntable 1 by rotating the clamp plate 3 to the non-clamping position. be separated from In the embodiment, the protrusion 8 is provided on the clamp plate 3, but the same effect can be obtained even if the protrusion 8 is provided on the collar piece 4a of the chucking member 4 . Furthermore, in the embodiment, the protrusion 8 was provided at a position that is away from the rotational axis of the clamp plate 3 from a straight line passing through the center of the mounting hole 3a, but the rotational movement moves it from the clamped position to the non-clamped position. In the case of the clamp plate 3 being displaced,
By doing so, the chucking member 4 can be reliably tilted in a predetermined direction and can be tilted easily. (g) Effects of the invention As described above, the invention forms a protrusion that generates contact force so that the chucking member tilts when the clamp plate is displaced from the clamping position to the non-clamping position. This has an advantage in that the suction force generated by the chucking member allows the chucking member to be smoothly separated from the turntable even if the chucking member is firmly pressed against the turntable.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of the present invention;
FIG. 2 is a perspective view showing a part of the clamp plate of the disk clamp device according to the present invention, FIG. 3 is a partial sectional view showing a disk player equipped with the disk clamp device of FIG. 1, and FIG. It is a partial sectional view for providing for explanation. Explanation of main drawing numbers, 1...turntable, 3...
...clamp plate, 3a...mounting hole, 4 ...chucking member, 4a...flange piece, 6...permanent magnet, 8...
...projection.

Claims (1)

[Scope of utility model registration request] In a disk clamping device for crimping and holding a disk on a turntable using the attractive force generated by a magnet, the device is supported so as to be movable between a clamped position where the disk is crimped onto the turntable and a non-clamped position. a clamp plate having a mounting hole formed at a position facing the turntable; one side serving as a pressing surface for pressing a disk disposed between the turntable; and a collar piece formed on the other side. , a chucking member loosely fitted into a mounting hole of the clamp plate by disposing the collar piece on a different side of the pressing surface with the clamp plate interposed therebetween; and a collar of the clamp plate and the chuck member. and a protrusion locally formed on the opposite surface of the clamp plate at a position offset from the straight line passing through the center of the mounting hole, and when the clamp plate is displaced from the clamping position to the non-clamping position, a contact force is applied to the protrusion. 1. A disk clamping device characterized in that said chucking member is separated from a turntable by generating a force.