JPS62271244A - Disk chucking device - Google Patents

Abstract

PURPOSE:To press and fix a disk on a turntable by utilizing repulsion, by providing a permanent magnet, and a disk pressing means made of an elastic material protruding to the turntable side beyond the permanent magnet, at a clamper which sandwiches the disk between the turntable. CONSTITUTION:By lifting down the other end side of a clamp arm 11 on a turntable 10, a clamper 12 is attracted to a turntable 12 side by the magnetic attracting action of a permanent magnet 20. With the above movement, a disk pressing means 21 is abutted on a disk D placed on the turntable 10, and is compressed relatively by being defeated by the magnetic attracting force, there fore, the disk D is pressed on the turntable 10 with the repulsion. At such a time, so that the clamper 12 is attracted until a time when a guide hole 19a is abutted with the upper end of a center spindle 14 against the elasticity of the pressing means 21 by the magnetic attracting force of the permanent magnet 20, the compressing width of the disk pressing means 21 is dependent on the thickness of the disk D.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a disk chucking device applied to an optical information reading device or the like.

[Prior Art] Conventionally, this type of chucking device, as illustrated in FIG. The clamper 4 is rotatably held on the side of the clamp arm 3, and the clamper 4 is provided with a permanent magnet 5 to press and hold the disk D on the turntable 2 by its magnetic attraction.

[Problems to be solved by the invention] In this conventional device, when the thickness of the disk D is thin, the attraction force of the permanent magnet 5 is sufficiently exerted, so that the disk D can be firmly held on the turntable 2. However, as the thickness of the disk D becomes thicker, the attraction force of the permanent magnet 5 becomes weaker, causing the disk D on the turntable 2 to become misaligned or float. was created in view of the problem mentioned in Section 2, and its purpose is to chucking a disc so that the pressing force (chucking force) of the disc on the turntable can be increased in accordance with the increase in the thickness of the disc. The goal is to provide equipment.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a clamper that clamps a disc between it and a turntable, and a permanent magnet and an elastic member that protrudes toward the turntable side from the permanent magnet. A disk pressing means made of a material is provided, and the disk is turned by using the repulsive force of the disk pressing means that is generated relatively when the clamper is drawn toward the turntable by the magnetic attraction action of the permanent magnet. It is pressed and fixed onto the table.

[Examples] Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

Referring to FIG. 1, this disk chucking device includes a turntable 10 made of a magnetic material that is driven one rotation by a motor (not shown), and one end (not shown) that can move toward and away from the turntable 10, for example. It includes a clamp arm 11 that is pivotally supported on the frame side of the reading device, and a clamper 12 that clamps the disc D between it and the turntable 10 is held at the other end of the clamp arm 11 so as to be rotatable and movable up and down. has been done.

In this embodiment, the turntable 10 includes:

A truncated conical guide taper part X3 that fits into the center hole of the disk D to center it, and a center spindle 14 that fits into the clamper 12 and positions it coaxially.
and is provided.

The clamper 12 has a base plate 15 formed, for example, in the shape of a disc and having an appropriate diameter. According to this embodiment, a holding hole formed at the other end of the clamp arm 11 is formed in the center of the L-shaped base of the base plate 15. 16, and an engagement plate 18 formed substantially larger than the holding hole 16 at the upper end of the shaft portion 17. Engagement and retention means are provided. On the other hand, a permanent magnet 20 is attached to the lower surface side of the substrate 15 via a holding member 19 preferably made of a magnetic material so as to coaxially face the turntable IO. Note that a guide hole 1'la for positioning that fits into the center spindle 14 is bored in the lower surface of the holding member 19.

According to the invention, the substrate 15 of the clamper 12
, a disk pressing means 21 made of an elastic material and protruding toward the turntable 10 side from the permanent magnet 20 is provided.
is provided. This disk pressing means 21 is made of a spring member such as rubber or a coil spring having an appropriate elasticity, that is, an elasticity set to be weaker than the magnetic attraction force generated between the permanent magnet 20 and the turntable 10. In the example, they are arranged in a ring shape around the permanent magnet 20. However, different from this, the disk pressing means 21 may be scattered concentrically at predetermined intervals.

In the above-described configuration, when the other end of the clamp arm 11 is lowered onto the turntable 10, the clamper 12 is attached to the turntable by the magnetic attraction action of the permanent magnet 20.
The disk pressing means 21 comes into contact with the disk D placed on the turntable 10, is overcome by its magnetic attraction force, and is relatively compressed. Therefore, the disc D is pressed onto the turntable 10 by the repulsive force. Here, the clamper 12 is pulled by the magnetic attraction force of the permanent magnet 20 against the elasticity of the disk pressing means 21 until the guide hole 19a comes into contact with the upper end of the center spindle 14, so that the width of the contraction of the disk pressing means 21 is reduced. depends on the thickness of the disk D. Therefore, as the thickness of the disk D increases, its repulsive force, that is, the pressing force against the disk D increases. Note that this disk pressing means 2
In order to more uniformly apply the pressing force of 1 to the disk D, as shown in FIG. It is preferable to form a flange 22.

[Effects] As is clear from the above description of the embodiments, according to the present invention, the clamper that clamps the disk between the turntable and the turntable by the magnetic attraction effect of the permanent magnet,
The simple structure of providing a disc pressing means made of rubber or a spring member that protrudes toward the turntable side from the permanent magnet allows the pressing force to be adjusted according to the thickness of the disc.
That is, as the thickness increases, the disk can be pressed and fixed onto the turntable with a stronger pressing force, and the effect is more significant.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of essential parts showing one embodiment of the present invention;
The figure is a sectional view of a main part showing a modified example that is slightly modified from the embodiment shown in FIG. 1, and FIG. 3 is a side view showing a conventional example partially in section. In the figure, 10 is a turntable, 11 is a clamp arm,
12 is a clamper, 14 is a center spindle, 15 is a substrate, 16 is a holding hole, 17 is a detail, 18 is an engagement plate, 19
20 is a permanent magnet, 21 is a disk pressing means, and 22 is a flange.

Claims (6)

[Claims] (1) It includes a turntable made of a magnetic material and a clamper rotatably held on the clamp arm side so as to face the turntable, and the clamper is equipped with a permanent magnet, and its magnetic attraction action In the disk chucking device that presses and holds the disk on the turntable, the clamper is provided with a disk pressing means made of an elastic material that protrudes toward the turntable rather than the permanent magnet. A disc chucking device featuring: (2) The disk chucking device according to claim (1), wherein the disk pressing means is made of a rubber material having a predetermined elasticity. (3) The disk chucking device according to claim (1), wherein the disk pressing means comprises a spring member having a predetermined elasticity. (4) The disk chucking device according to claim (1), (2) or (3), wherein the disk pressing means is arranged in an annular shape around the permanent magnet. (5) In claim (1), (2) or (3), the disk is characterized in that the disk pressing means is arranged concentrically around the permanent magnet at a predetermined interval. Chucking device. (6) In claim (1), the turntable has a center spindle that fits into the clamper, and the center spindle is formed with a flange that contacts the bottom surface of the clamper and holds it horizontally. A disk chucking device characterized by: