JPS58194181A - Disc clamping device - Google Patents

Abstract

PURPOSE:To attain an accurate aligning device of a disc with a simple construction, small size and light weight, by providing a member, whose tip is spherical, which is energized radially from the outer circumference and is rotated simultaneously with around the same rotating axial center with that of a turntable, for a disc device including a projecting section which is inserted with a margin in diameter to a fitting hole of a disc, when the said disc is loaded on the turntable. CONSTITUTION:A disc loading section having a diameter slightly smaller than that of the disc fitting hole 7 is projected from the rotating center section of the turntable 20, and a spherical projection which disappears in pressing it, e.g., a steel ball 25, or a rod-shaped pressing member 34 whose tip is spherical, is provided around the disc loading section. In loading the disc 6 to the disc loading section, the disc 6 is loaded while pressing the projection, and the disc 6 is energized toward the inserting direction with a component of a force due to an inclination of the spherical surface when the projection restores toward the outer circumferential direction, and the disc 6 is pressed on a tapered centering hub 27 energized with a spring force against the inserting direction and aligned. Further, in pushing the centering hub 27 slightly against its spring force, the disc 6 is pressed on the turntable and loaded.

Description

[Detailed Description of the Invention] This invention consists of 1. The present invention relates to a clan two device for loading a disk storing information into an information reading device.

The purpose is to provide a device that has a simple structure, can be miniaturized, and allows accurate centering and mounting of disks.

Conventionally, there has been a disc clamping device as shown in FIG. In the figure, holder 1 is 1kI of Kakuayu Tanabata 2.
13, and the turntable 48 can be attached to it.-C1
One rotation force of the motor 2 is transmitted to the turntable 4. A centering ring 5 is installed in the center of the turntable 4.
A holder 9 is slidably fitted to the shaft 3, the side surface thereof forms a tapered part 8 into which the outer peripheral surface of the mounting hole 7 of the disc 6 is inserted, and is biased upward in the drawing by a compression spring 91. The upper part of l forms a magnet mounting part 10, on which a magneto) 11 is mounted, and also locks the upward movement of the centering hub 5, and at the locking position, the magnet
The outer diameter of the tapered portion 8 where the disk mounting surface of the table 4 crosses is made slightly larger than the diameter of the mounting hole 7 of the disk 6. On the other hand, on the player part 12, there is a cap 13 that faces the shaft 3 and concentrically and holds down the disc 6 from above when the turnip 12 is closed as shown in the figure.
It is attached so that it can be moved to the upper and lower fIIt positions in the figure with respect to 1fi12. A guide via 14 is fixed above the magnet scattering 910 coaxially with the shaft 3, and a hole 15 is provided in the cap 13 to face the guide pin 14 and receive it. , the positioning of the canog 13 and the centripetal center relative to the centering hub 5 fathoms. At this time, the cap 13 is attracted by the magnet 11 and the cap 13
The end face 16 of the disc 6 is brought into contact with the turntable 4 while being brought into contact with the centering hub 5.

However, in such a configuration, the structure for attaching the cap 13 to the player lid 12 becomes complicated, the overall height of the player fi 12 increases thereby, and the structure for dispersing the magnetite 11 requires a clamping device. The problem was that the whole thing was made to be large.

In this invention, a disc mounting part having a slightly smaller diameter than the disc mounting hole 7 protrudes from the center of rotation of the turntable, and a spherical protrusion is provided around the disc mounting part so as to be retracted when pressed. When installing the disc, press the protrusion while inserting it, and when it goes past the top of the protrusion,
When the protrusion tries to return to the outer circumferential direction, one isk is biased in the insertion direction by the component force due to the inclination of the spherical surface.
The disk meets the centering hub, which is shaped like a bar and is biased by a spring force against the direction of the person walking, and is centered, and further the centering hub is slightly pushed against the spring force. When pushed in, the disc is pressed into contact with the turntable and installed.

Embodiments of the present invention will be described below with reference to FIGS.

In FIG. 2, the holder main body 17 is fixed to the shaft 19 of the drive motor 18, has a turntable 20 attached thereto, and transmits the rotational force of the motor 18 to the turntable 20. The holder 17 is provided with a disc mounting part 21, the outer diameter ρ of which is smaller than the diameter of the mounting hole 7 of the disc 6,
The disk 6 is mounted on a turntable as shown in the figure, and the disk 6 protrudes upward in the figure from the mounted state 111. The disk mounting portion 21 is provided with a plurality of slots which are equally divided radially around the circumference and are arranged in the same plane parallel to the turntable. Compression springs are inserted into the bottom of each, a rigid ball 25 that is slidably fitted into a hole 23 is inserted into the outside thereof, and a presser plate 26 is attached above to maintain the sliding state. A centering hub 27 is attached to the outer periphery 22 of the holder 17 so as to be able to move slightly up and down in the figure and is biased with an upward J spring force. 6 is attached, the periphery of the mounting hole 7 is pressed against the periphery of the mounting hole 7. A lock s29 is also provided above the centering hub 27 to prevent the hard ball δ from escaping.
The diameter of the circumference connecting the vertices in the mounted state is slightly larger than the diameter of the mounting hole 7 in the disk 6J. In addition, the center 31 of the hard ball 25 is positioned outside the upper surface 32 of the hard ball 25 when the disc 6 is attached, and a part of the spherical surface of the hard ball 25 is inscribed in the mounting hole 7. . Player lid 33
is just a lid, and this clamp mechanism is not involved.

In the configuration shown in Figure 2 above, when the player lid is opened,
Connect the mounting hole 7 of the disc 6 to the disc mounting part 2 of the holder 17.
1, each hard ball 25 resists the spring force and moves toward the shaft 1.
After that, the return force of the spring force acts as a component force that presses the disk 6 upward in the figure in the mounting hole 7 due to the inclination of the spherical surface of the rigid ball 6, and the disk 6 is pushed in the direction of 9. Then, the lever portion 28 of the centering hub 27 is pressed down, and the centering hub 27 further moves downward slightly and comes into contact with the turntable 20, completing the installation. As the tar/table rotates, the rigid ball 25 is acted upon by the outward force of the narrow 19 in the tC direction due to centrifugal force.
It acts in the direction of strengthening the force that presses the c1 disc 6 against the turntable.

FIG. 3 shows another embodiment, in which a rod-shaped suppressing member with a spherical tip is provided in place of the rigid sphere δ in FIG. 3, and other structures and action,
The effect is the same as in FIG.

As described above, according to the present invention, the structure is simple and the centering and mounting of one isk is reliable.
-C. The entire device is made smaller and lighter.

Furthermore, since the device has no relation to player profits, processing and MIi% are also easy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional example of a clap device;
FIG. 3 is a sectional view of an apparatus showing each embodiment of the present invention. 6...Disc, 17...Holder body, 18...
Drive motor (rotary drive unit), 20... Turntable, Applicant: Asahi Optical Industry Co., Ltd. @1 Figure 1ri

Claims (2)

[Claims] (1) A device for reading information from a disk that is made up of a rotating plate and has a mounting hole in its center of rotation and stores information, comprising: a turntable that is rotated by a rotation drive unit and carries the disk; A member having a tapered portion that is coaxial with the rotation center of the turntable in order to be inscribed in the mounting hole of the disk and for mounting the disk, and when the disk is mounted on the turntable, the tapered portion a centering spring which locks the disc and is biased against the mounting direction of the disc by a spring force, and a member which rotates simultaneously with the same rotational axis as the turntable, and the disc is rotated at the same time as the turntable. The disc mounting part includes a protruding part that is inserted into the mounting hole with an allowance in the diameter when the disc is mounted on a table, and the disc mounting part has a plurality of holder actuating members over its outer circumference. A holder main body provided with a storage section, and a plurality of members respectively stored in the holder actuating member storage sections, each of which is arranged in a plane parallel to the emit turntable, and the holder main body is moved by a spring force. radially biased outward toward each other, each having a spherical (3)-shaped tip protruding from the outer periphery of the disk mounting portion, and a circle passing through the apex of each tip is defined by the It is coaxial with the holder main body and is locked in a position where the diameter of the circle exceeds the diameter of the mounting hole of the disk, and when each of the tips is pressed against the radial spring force, the circle l! is movable in the direction of reducing the diameter of the circle so that the diameter of l! is smaller than the diameter of the mounting hole. ? A plane connecting the apex of each tip of J is located outside of the outer surface of the disk, and a part of the spherical surface is inscribed in each of the mounting holes in the loaded state. A disc clamping device comprising a holder operating member. (2) The holder operating member storage portion of the holder main body is comprised of a plurality of holes provided radially around the outer periphery of the holder main body, and the holder operating member has respective spherical parts that are slidably fitted into each of the holes. A disc clamping device as shown in the first paragraph of the patent application.