JPH0438752A - Disk clamping mechanism - Google Patents

Abstract

PURPOSE:To prevent a disk from falling off at the time of high-speed rotation by clamping the disk securely by making the pressing surface of a piece coincide with the sectional form of the chamfered side surface of a center hole, and pressing the side surface outward from the inside. CONSTITUTION:The disk 1 to be inspected positioned by the projection 4a' of the upper edge of a cylinder 4a is rotated together with the cylinder 4a. A center shaft 4 passing through the inside of the cylinder 4a and energized upward by a spring 4b is provided, and a clamping part 4d is fixed to the tip of the shaft. An actuator ring 4e with a conical slope 4e' is fixed to the inside of the cylinder 4a, and the outer circumference of the center shaft 4c is in contact and slides with it. When the center shaft 4c goes down, the pieces 4h are pressed outward by the slope 4e' of the actuator ring, and the piece press outward the side surface of the center hole of the disk 1 from the inside. Since the sectional form of the side surface of the center hole coincides with the pressing surface of the pressing piece, the disk is securely clamped, and it is never disengaged and never falls off even if the disk rotates at high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clamping mechanism for a hard disk such as a hard magnetic disk.

[Prior Art] Hard magnetic disks (hereinafter referred to as disks) used in information processing devices are inspected by a defect inspection device because if there are defects on the surface, the quality will be low. In the inspection device, since the disk rotates at high speed, it is necessary to reliably clamp the disk using a clamping mechanism. Various types of clamping mechanisms (also referred to as clamping mechanisms) have been developed, but the present invention is designed to efficiently attach and detach disks to and from inspection equipment in order to automate inspections. A number of inventions have been filed for utility model registration or patent application by several applicants.

Figures 2 (a) and (b) show the above-mentioned utility model registration application “
No. 63-48958S; shows the structure of the "disc positioning chuck mechanism". In Figure (a), a projection 2a' of a ring rod for positioning is provided on the end face of the cylinder 2a of the chuck mechanism 2, and the disk 1 to be inspected is positioned and placed thereon, and the disk 2 is placed on the cylinder 2a. 2
It rotates together with a by a rotation mechanism (not shown). 7. A central shaft 2c passes through the cylinder 2a and is strongly biased by a spring 2b, and a chuck head 2d having a conical slope is fixed to the tip thereof. Furthermore, the chuck ring 2e, which is biased in the L direction by the spring 2f, is fitted onto the central axis 2c. Chuck ring 2e is shown in figure (b)
It has a four-part structure as shown in the figure. Right "l" in figure (a)
indicates the front of the clamp, and "1" on the left indicates the clamped state.In the case of the present invention, the center shaft 2c is kW, and the "2" part of the chuck ring 2e is inclined inward, and the disk 1 to be inspected is Its center hole passes through the chuck head 2d and is placed on the cylinder 2a.

In the clamping operation, the center axis 2 is
a descends, and part -1 of the chuck ring 2e opens outward due to the slope of the chuck head 2d, and the chuck →.

The surface of the tip of the cling presses the surface of the disk 1 near the center circle downward and chucks it.

FIGS. 3(a), (b), and (c) show the structure of the above-mentioned Japanese Patent Application No. 571 ``No. or-sIars 3, Clamping Mechanism for Magnetic Disk''. In figure (a), a cylinder 3a for positioning and placing a disk, a positioning protrusion 3a'
The central shaft 3c1 biased by the spring 3b and the clamp head 3d fixed to the tip of the central shaft are
The same operation is performed with the same configuration as in the case of FIG.
As shown in Figure (b), a steel ring is covered with hard rubber and the - part is cut out. In the clamping operation, the clamp head 3d descends as shown at 14 on the left in Figure (a), and the pressing ring 3e opens outward due to its slope, pressing the surface of the disk 1 in the opposite direction and clamping it. Figure (c) shows details of the suppression.

[Problem to be solved] In magnetic disk inspection, defects are detected by irradiating the surface of the disk with a laser beam and receiving the scattered light. The laser beam may be unnecessarily scattered by the tip of the pressing ring 2e or the pressing ring 3e and may be mistaken for a defect. For this purpose, there is a method of inspecting by excluding the surface near the center hole, but recently the size of magnetic disks has been reduced to, for example, 3.5 inches, and such small 1-inch disks In this case, the margin of area to be excluded is very narrow. For this reason, the method of pressing the surface of the disk is not preferred. Therefore, it is effective to clamp the disk by pressing the side surface of the center hole outward while avoiding the surface.

This invention has been made in view of the above-mentioned problem 1-, and provides a mechanism for clamping by pressing the side surface of the center hole outwardly while avoiding the surface of the disk.

[Means for Solving the Problems] This invention comprises: a cylinder for viewing and placing a disk to be inspected; a central shaft passing through the center of the cylinder and biased downward by a spring; The actuator wheel is fixed inside the center shaft and has a conical slope, and is in sliding contact with the outer circumferential surface of the center shaft. The clamp section is fixed to the tip of the center shaft. will be established. The push piece is biased inwardly by a spring and presses the pressing surface that corresponds to the cross-sectional shape of the edged side surface of the center hole of the disk f-s'', and as the center shaft descends, the actuator wheel Upon contact with the slope of the disk, the pressing surface presses the side surface of the center hole of the disk outward in the water/V direction and clamps it.

[Function] In the clamp mechanism having the configuration 1- below, when the center shaft descends, the slope of the actuator wheel pushes the pressing piece outward, and the pressing surface presses the side surface of the center hole of the disk outward. Clamp. Since the pressing surface matches the cross-sectional shape of the side surface of the center hole where the edge has been cut, clamping is ensured, and the pressing surface does not come into contact with the surface of the disk, preventing defects due to unnecessary laser beam scattering. The drawback of misreading is eliminated.

Embodiment FIG. 1 (aL) (b), (c) and (d) shows the structure of an embodiment of the disk clamping mechanism according to the present invention.

Figure (a) shows the clamping mechanism 4 before clamping, and one end of the first ring 4a is provided with a positioning protrusion 4a', and the disk 1 to be inspected positioned and placed is placed together with the cylinder 4a in Figure 1< Rotates using a rotary mechanism. A central shaft 4 is provided which passes through the inside of the cylinder 4a and is biased in one direction by a spring 4b, and a clamp portion 4d is fixed to the tip thereof. Furthermore, an actuator wheel 4e having a tuna-shaped slope 4e' is fixed inside the cylinder 4a, and the outer periphery of the central shaft 4c passing through l'1 comes into sliding contact with the actuator wheel 4e.

Figure (b) shows a diagram of the assembly X'/ of the clamp part 4d,
Components: Cover 4F 13 pressing pieces 4H 1 Base 4G
1 spring 41 and pin 4j.

The pressing piece 4h is provided with an elliptical hole 4h' and a pressing surface 4h'' that matches the cross-sectional shape of the edged side surface of the center hole of the disk. The oval hole 4h'' is inserted and the pressing piece is fitted into the notch groove. A spring 4I is inserted into the oval hole 4h', and then covered with a cover 4f and screwed! 1. Being teased. The spring 4j biases the pusher 11 piece 4h with an internal force, and the outer appearance is as if the pusher J1 piece 4h has been pushed and is protruding outward as shown in the small taji \1. Figure (C) shows that when the clamped state is changed to 7 degrees and the central shaft 4C is lowered, each pusher J1 piece 4h is pressed outward by the slope 48' of the actuator wheel, and the pressing surface is the side surface of the center hole of the disk 1. Press outward from the inside. Figure (d) shows the details of the suppressed state. Since the pressing surface of the pressing piece matches the cross-sectional shape of the side surface of the center hole, it is securely clamped, and there is no risk of it coming off and falling off even if the disk rotates at high speed. None.

[Effects of the Invention] As is clear from the explanation in -1- below, in the clamp mechanism of the present invention, the pressing surface of the pressing piece is made to match the cross-sectional shape of the side surface where the edge of the center hole is cut, and the side surface is This system firmly clamps the disc by pressing it outward from the inside, so there is no risk of it falling off even when the disc rotates at high speed, and since the pressing surface is in contact with the surface of the disc, it does not occur with conventional clamping mechanisms. The disadvantage of misidentifying defects due to laser beam scattering is eliminated by a factor of 1, and the effect of improving magnetic disk inspection is impressive.

[Brief explanation of the drawing]

FIGS. 1(a), (b), (c) and (d) are a structural diagram and an assembled X'l diagram of the clamp part in an embodiment of the disk clamp mechanism according to the present invention, and FIGS. 2(a) and 1(d) are (b) is a structural diagram of the "disc positioning chuck mechanism" related to the utility model registration application, and Fig. 3 (a). (b) and (c) are structural diagrams of the "magnetic disk clamping mechanism" according to the patent application. l...Magnetic disk, 2...Chuck mechanism,
3.4... Clamp mechanism, 2a, 3a, 4a... Cylinder, 2a'13a +42'... Positioning protrusion, 2b,
2f, 3b, 4b, 4 i...Spring, 2c, 3
c, 4c...center axis, 2d, 3d...chuck or clamp head, 2e
... Chuckling '7', 3e... Pressure ring, 3
f...Steel ring, 4d...Clamp part, 4e
...actuator wheel, 48'...slope, 4f...
・Cover 4g...Base, 4h...Press piece, 4h''...Press surface. 4h'...Oval hole, Patent 1: 1 Applicant B tl, Attorney for Denshi Engineering Co., Ltd. Kajiyama This is the patent attorney Tomio Yamaki = 10 (a) Part (b)

Claims (1)

[Claims] (1) A cylinder that positions and places the disk to be inspected, a central shaft that passes through the center of the cylinder and is biased downward by a spring, and an outer periphery of the central shaft that is fixed inside the cylinder. The actuator wheel is in sliding contact with the surface and has a conical slope, and the clamp part is fixed to the tip of the central shaft. It has a pressing surface that matches the cross-sectional shape of the side surface with a chamfered edge of the central hole, and as the central axis descends, the pressing surface contacts the slope of the actuator wheel, causing the pressing surface to press the side surface of the central hole of the disk. A disk clamp mechanism characterized by having a plurality of pressing pieces that press outward in a horizontal direction to clamp the disk.