JP2588047B2 - Disc clamp mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp mechanism for a hard disk such as a hard magnetic disk, and more particularly, to miniaturization of the clamp mechanism.

[Related Art] A hard magnetic disk (hereinafter, simply referred to as a disk) used in an information processing apparatus is inspected by a defect inspection apparatus because if the surface has a defect, the quality deteriorates. In the inspection device, since the disk rotates at a high speed, it is necessary to securely clamp the disk by the clamp mechanism. Various types of clamp mechanisms (also referred to as chuck mechanisms) have been developed, and the applicant of the present invention considers that a disk can be efficiently attached to and detached from an inspection apparatus in order to automate inspection. Several applications have been filed for utility model registration applications or patent applications.

FIGS. 2 (a) and 2 (b) show the above-mentioned utility model registration application "No. 63-48958, disk positioning chuck mechanism".
The structure of is shown. In FIG. 1A, a ring-shaped projection 2a 'for positioning is provided on the upper end surface of a cylinder 2a of the chuck mechanism 2.
Is provided, whereby the disk 1 to be inspected is positioned and mounted, and the disk 1 is rotated together with the cylinder 2a by a rotation mechanism (not shown). A center shaft 2c penetrating through the cylinder 2a and urged downward by a spring 2b is provided, and a chuck head 2d having a conical slope at the end thereof is fixed. Further, a chuck ring 2e urged upward by a spring 2f with respect to the center shaft 2c is inserted. The chuck ring 2e has a quarter structure shown in FIG. The right half of the figure (a) shows the state before clamping and the left half shows the clamped state. In the right half, the center axis 2c rises and the upper part of the chuck ring 2e is inclined inward, and the disk 1 to be inspected is placed on the cylinder 2a through the center hole of the chuck head 2d. In the clamping operation, as shown in the left half, the center axis 2a descends, the upper part of the chuck ring 2e opens outward due to the slope of the chuck head 2d, and the lower surface of the tip of the chuck ring is near the center circle of the disk 1. Is pressed downward to chuck.

3 (a), 3 (b) and 3 (c) show the structure of the aforementioned patent application "No. 01-81018, clamping mechanism for magnetic disk". In FIG. 5A, a cylinder 3a for positioning and mounting a disk, a positioning protrusion 3a ', and a spring 3b
The center shaft 3c urged downward by the above and the clamp head 3d fixed to the end of the center shaft are described above with reference to FIG.
The same operation is performed with the same configuration as in the case of (1). However, in this case, the pressing ring 3e is fitted into the clamp head 3d. The pressing ring 3e is, as shown in FIG.
A steel ring is covered with hard rubber, and a part of the steel ring is cut away. In the clamping operation, the clamp head 3d descends as shown in the left half of FIG. 9A, and the pressing ring 3e opens outward due to the slope of the clamping head 3d, thereby pressing the surface of the disk 1 downward and clamping. FIG. 3C shows details of the pressing.

[Problem to be Solved] The size of a recent magnetic disk is reduced to, for example, 3.5 inches, and accordingly, it is required to make the inspection apparatus compact accordingly. It is necessary to make the height of the object as low as possible. On the other hand, in the above-mentioned conventional mechanism, since the slope for the pressing action is provided on the center axis side, the height is inevitably increased. Therefore, it is conceivable to provide a pressing slope on the cylinder side to reduce the height.

The present invention has been made in view of the above, and an object of the present invention is to provide a low-height clamp mechanism having a pressing slope provided on a cylinder side.

[Means for Solving the Problems] The present invention relates to a cylinder for positioning and mounting a disk to be inspected, a center shaft that penetrates the center of the cylinder, and is urged downward by a spring; An actuator wheel, which is fixed and slidably contacts the outer peripheral surface of the central shaft and has a conical slope, is provided with a clamp portion fixed to the tip of the central shaft, and the clamp portion is provided with a plurality of pressing pieces. The pressing piece is biased inward by a spring, and has a pressing surface inclined with respect to the side surface of the center hole of the disc,
The pressing surface presses the edge of the side surface of the center hole of the disk due to the contact with the inclined surface of the actuator wheel as the central axis descends, and clamps the disk by the horizontal component and the vertical component of the pressing force.

[Operation] In the clamp mechanism having the above-described configuration, when the central axis is lowered, the pressing piece of the clamp portion comes into contact with the inclined surface of the actuator wheel fitted and inserted into the central axis and is pushed outward, and the pressing surface is disc-shaped. Presses the edge of the side surface of the center hole of the center hole and securely clamps by the horizontal component force and the vertical component force.Because the pressing slope is provided on the actuator wheel fixed to the cylinder, the slope is At the same height position, the height of the clamp mechanism is lower than that of the conventional one, and the inspection apparatus can be made compact.

[Embodiment] FIGS. 1A, 1B and 1C show the structure of an embodiment of a disk clamp mechanism according to the present invention. FIG. 1A shows a clamping mechanism 4 before clamping, in which a positioning protrusion 4a 'is provided at the upper end of a cylinder 4a, and the disk 1 to be inspected positioned and mounted is rotated together with the cylinder 4a by a rotating mechanism (not shown). I do. A center shaft 4 penetrating through the inside of the cylinder 4a and urged upward by a spring 4b is provided, and a clamp portion 4d is fixed to a tip end thereof. Also,
An actuator wheel 4e having a conical slope 4e 'is fixed inside the cylinder 4a, and the outer periphery of the center shaft 4c penetrating the actuator wheel 4e makes sliding contact. FIG. 4B shows an assembly diagram of the clamp portion 4d, and the components include a cover 4f, three pressing pieces 4h, a base 4g, a spring 4i, and a pin 4j. Pressing piece 4h
Is provided with an elliptical hole 4h 'and a pressing surface 4h "which is inclined by approximately 45 ° with respect to the side surface of the center hole of the corresponding disk.
The oval hole 4h 'is inserted into the pin 4j fixed to the 4g notch groove, and the pressing piece is inserted into the notch groove. The springs 4i are inserted into the oval holes, and these are covered with a cover 4f and screwed. The spring 4i urges the pressing piece 4h inward, and the assembled appearance shown is a state in which the pressing piece 4h is pressed and protrudes outward. FIG. 4C shows a clamped state, in which the actuator wheel 4e does not descend even if the center shaft 4c descends, and the respective pressing pieces 4h are pressed outward by the slope 4e ', and the pressing surface 4h " And press the horizontal component PH and vertical component PV of the pressing force.
As a result, the disk 1 is securely clamped, and there is no possibility that the disk 1 will fall off even if the disk rotates at a high speed.

[Effects of the Invention] As is clear from the above description, in the clamp mechanism of the present invention, since the pressing slope is provided on the actuator wheel fixed to the cylinder, the height of the slope is the same as that of the disk. As a result, the height of the clamp mechanism is reduced, and there is a great effect that the inspection apparatus for a small magnetic disk can be made compact.

[Brief description of the drawings]

FIGS. 1 (a), 1 (b) and 1 (c) are a structural view and an assembly view of a clamp portion in an embodiment of a disk clamp mechanism according to the present invention, and FIGS. 2 (a) and 2 (b) are utility model registration applications. 3 (a), 3 (b) and 3 (c) are structural views of a "magnetic disk clamping mechanism" according to the patent application. 1 ... Magnetic disk, 2 ... Chuck mechanism, 3,4 ... Clamp mechanism, 2a, 3a, 4a ... Cylinder, 2a ', 3a', 4a '... Positioning protrusion, 2b, 2f, 3b, 4b, 4i: Spring, 2c, 3c, 4c: Central shaft, 2d, 3d: Chuck or clamp head, 2e: Chuck ring, 3e: Press ring, 3f: Steel ring, 4d: Clamp, 4e …… Actuator wheel, 4e ′ …… Slope, 4f …… Cover, 4g …… Base, 4h …… Pressing piece, 4h ′ …… Oval hole, 4h ″… Pressing surface.

Claims (1)

(57) [Claims] 1. A cylinder on which a disk to be inspected is positioned and mounted, a central axis penetrating through the center of the cylinder and urged downward by a spring, and a central axis fixed inside the cylinder. An actuator wheel having a conical slope, which is in sliding contact with the outer peripheral surface of the actuator, and a clamp portion fixed to the end of the central shaft, and the clamp portion is urged inward by a spring, The disk has a pressing surface inclined with respect to the side surface of the center hole of the disk, and the pressing surface presses the edge of the side surface by contact with the slope of the actuator wheel as the center axis descends, and the pressing force is leveled. A disc clamping mechanism comprising a plurality of pressing pieces for clamping the disc by a component force and a vertical component force.