JP2563227B2 - Disc clamp device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc clamp device for fixing or clamping a disc such as a hard disc.

[0002]

2. Description of the Related Art In the hard disk inspection in a manufacturing line, a disk is conveyed to an inspection device by a robot hand for improving productivity, and the disk clamping and inspection are automated. There is. In a conventional disc clamp device, a plurality of annularly arranged support pieces are contracted inward when a disc is mounted, and are expanded outward after the disc is mounted to clamp the disc by pressing an inner diameter edge portion of the disc. But,
In this device, dimensional variations occur in the pressing direction due to processing errors and assembling errors of each support piece, and each support piece presses the inner diameter edge of the disk unevenly during clamping. Therefore, when the disc size becomes smaller and the disc becomes thinner, the disc becomes deformed, and the distortion waveform due to the disc deformation becomes the measured waveform in the vicinity of the inner diameter edge of the disc near the clamp point. In some cases, normal measurement may not be possible.
As a structure for preventing such deformation of the disc,
A cap-clamp system in which the vicinity of the inner diameter edge of the disk is placed on a flat surface and the upper surface of the disk is pressed by surface contact with the lower surface of the cap is considered. According to this method, it is possible to prevent the deformation of the disc during clamping by uniformly pressing the flat surface near the inner diameter edge of the disc with the cap. However, in this case, a robot hand for attaching and detaching the cap is required, which is disadvantageous in that the device becomes expensive.

Therefore, the object of the present invention is to
(EN) A disk clamp device for clamping a hard disk by surface contact such as a cap clamp method without requiring a hand.

[0004]

DISCLOSURE OF THE INVENTION The disk clamp device of the present invention is mainly composed of a clamp base having a cylinder member and a piston member, a plurality of clamp fingers and a cap. The cylinder member has a through-hole in the center, an annular flat surface on which the hard disk is placed, a shoulder protruding inside the annular flat surface, and a tapered tip extending upward inside the shoulder. Parts. The piston member slides up and down within the through hole of the cylinder member, and an extending screw portion is provided on the upper surface thereof and a spacer having a collar portion is placed. The cap is attached to the threaded portion of the piston member with the opening facing downward. Each of the plurality of clamp fingers has a curved side surface portion, an inwardly extending claw portion provided at an upper end thereof and an outwardly extending projecting edge portion provided at a lower end thereof, and the claw portion is disposed above the collar portion of the spacer. And are evenly spaced in the cap. When the piston member is in the upper limit position, it is in the unclamped state, and the finger member is in a state in which the claws are suspended by the collar of the spacer, and the projecting edge is tilted by its own weight and the protruding edge is located inside the annular flat surface of the cylinder member. However, the disc can be attached and detached. When in the lower limit position, the finger member is in the clamped state, the side surface of the finger member is pushed outward by the tip of the piston member, and the protruding edge is pressed by the lower surface of the cap member, so that the protruding edge and the annular flat surface of the cylinder member. The disk is sandwiched and fixed by surface contact between the parts.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a disk clamp device of the present invention in an assembled state, and FIG. 2 is an exploded perspective view of the device of the present invention.
FIG. 3 is a view of the apparatus of the present invention in a disk clamp state.
2 is a cross-sectional view taken along the line AA of FIG. 1 and the configuration of the device of the present invention will be described with reference to these drawings. As shown in FIGS. 1 to 3, the disc clamping device of the present invention includes a clamp base 10, a clamp finger 12 and a cap 14 as main components.
The hard disk is clamped between the fingers 12.
Preferably, the clamp base 10 and the cap 14 are made of aluminum and the clamp fingers 14 are made of an elastic material such as Polyplastics under the trade name "Duracon".
Made of polyacetal resin sold by.

As shown in FIGS. 2 and 3, the clamp base 1
The 0 has an inner cylinder 16, an outer cylinder 18 and a piston rod 20 as its main components. The inner cylinder 16 is, in order from the bottom, a bottom portion 16a coupled to an air supply and rotation drive device (not shown), a disk-shaped base portion 16b having a relatively large diameter, a first cylindrical portion 16c having a diameter smaller than the disk-shaped base portion, and a first cylinder portion 16c. Second cylindrical portion 16 having a smaller diameter than the cylindrical portion
d, and a tapered portion 16e that tapers upward, and a through hole 1 that accommodates the piston rod 20 therein
It has 6f. The through hole 16f is composed of three cylindrical hollow portions having a diameter that decreases from the bottom.

The shaft portion 20a of the piston rod 20 has a diameter slightly smaller than the inner diameter of the uppermost hollow portion of the through hole 16f and longer than the total length of the upper two hollow portions of the through hole 16f. Further, the piston rod 20 extends radially parallel to each other at the lower end of the shaft portion 20a, and has a through hole 16f.
Has a piston portion 20b in which a pair of annular projecting edges having a diameter substantially equal to the inner diameter of the lowermost hollow portion is formed. Between the pair of annular projecting edges of the piston portion 20b, the inner cylinder 1
A packing 24 is enclosed in order to enhance airtightness between 6 and the piston portion 20b. A coil spring 22 is arranged between the upper end of the hollow portion in the middle of the through hole 16f and the piston portion 20b to press the piston portion 20b downward. On the upper surface of the shaft portion 20a of the piston rod 20, there is formed an elongated threaded portion 20c formed by cutting a male screw extending from the center thereof.
Further, on the upper surface of the shaft portion 20a of the piston rod 20,
A spacer 28 having a cylindrical portion having a central opening and a collar portion along the lower end of the cylindrical portion is provided on the piston rod 20.
It is arranged through the screw portion 20c of the.

The outer cylinder 18 of the clamp base 10 is, in order from the bottom, a disc-shaped base portion 18b having the same diameter as the disc-shaped portion 16b of the inner cylinder 16 and the first cylinder of the inner cylinder 16.
A disk-shaped portion 18 that comes into contact with and surrounds the cylindrical portion 16c.
Third cylindrical portion 18b, third cylindrical portion 18 having a smaller diameter than a
and a fourth cylindrical portion 18d having a diameter smaller than c. The disk-shaped parts 16b and 18a are superposed, and an air supply / rotation device (not shown) including an air supply and a rotation motor.
In addition, the bottom portion 1 of the inner cylinder 16 is connected to the air supply port of this device.
6a is fixed with the screw 26 in the fitted state.
The top of the fourth cylindrical portion 18c is an annular flat surface on which the hard disk 40 is arranged, and it is necessary to form the flat surface in parallel with the lower surface of the disk-shaped base portion 16b and to have high flatness. The height of the top surface of the fourth columnar portion 18c is lower than that of the first columnar portion 16a, the upper end of the first columnar portion 16a is exposed, and the shoulder portion 16g is formed. The outer diameter of the shoulder 16g is approximately equal to the inner diameter of the hard disk under test.

Each of the three clamp fingers 12 is
The curved side surface portion 12a and the upper end of the side surface portion 12a extend toward the inside of the curve of the side surface portion at a substantially right angle to the side surface portion,
A pair of claw portions 12b separated into two by a notch portion,
A protruding edge portion 12c having a hook-shaped cross section, which has an edge portion extending substantially at a right angle to the side surface portion along the lower end of the side surface portion 12a and a protrusion protruding downward along the tip of the edge portion.
And an inclined portion 12d is formed at the inner lower end portion of the side surface portion facing the projecting edge portion. The tip of the protrusion 12c is
Since the disk is sandwiched and clamped together with the top surface of the outer cylinder 18, it is necessary to form the disk with high flatness. The three clamp fingers 12 have the claws 12b and the spacers 2
They are evenly arranged on the brim of No. 8. In the disc clamped state shown in FIG. 3, the clamp finger 12 is in a substantially upright state, and the claw portion 12 is separated from the collar portion of the spacer 28.

The cap 14 has a flat plate portion 14a and a cylindrical portion 14b having one end joined to the flat plate portion 14a. The flat plate portion 14a is provided with a central opening 14c having a spherical or conical curved surface side portion. In the cap 14, the other end of the cylindrical portion 14b is on the clamp base 10 side, and the central opening 14c is arranged through the threaded portion 20c of the piston rod 20. The inner diameter of the cap 14 covers the side surface portion 12a and the claw portion 12b of the clamp finger 12 in the state shown in FIG. 3, and the other end, that is, the lower surface of the clamp cap 14 is on the upper surface of the edge portion 12d of each finger clamp 12. It is the corresponding size. Cap 14
The flat plate portion 14a is provided with three small openings 14d around the central opening 14c at positions corresponding to the cutout portions of the claw portions 12b of the three clamp fingers 12.
A pin 30 is inserted and fixed in each of these openings,
When the tip of the clamp finger 12 is inserted into the notch of the claw portion 12b, each of the clamp fingers 12 is clamped.
Movement is suppressed in the circumferential direction.

The clamp washer 32 is provided with the cap 14
The center opening 14c has a curved surface portion 32a having the same curvature as that of the curved side portion of the central opening portion 14c and a flat plate portion 32b coupled to the curved surface portion 32a. Clamp / washer 32
Is the central opening 32c with the curved surface portion facing the clamp base 10 side.
Is passed through the threaded portion 20c, and the curved surface portion of the clamp washer 32 contacts the curved surface side portion of the central opening 14c of the cap 14. By such contact of the spherical surface or the conical surface, the clamp washer 32 can apply a uniform force in the circumferential direction of the cap 14. The nut 34 is attached to the threaded portion 20c to prevent the clamp washer 32 from coming off the threaded portion 20c.

FIG. 4 is a sectional view showing the unclamped state of the device of the present invention, and the operation will be described with reference to FIGS. 3 and 4. In the disk clamp state shown in FIG. 3, when air is supplied from the air supplier into the through hole 16f through the bottom portion 16a of the inner cylinder 16, the air pressure counteracting the spring force of the coil spring 22 causes the air pressure as shown in FIG. Piston rod 2
0 is pushed up. Clamp fingers 12 and cap 14 are pushed up by spacers 28 on piston rod 20. At this time, clamp finger 1
2, the claw portion 12b is hung and hooked on the collar portion of the spacer 28, and the upper end comes into contact with the inner surface of the cap 14 from the upright state shown in FIG.
The state in which d approaches the tapered portion 16e of the inner cylinder 16 is achieved. In this state, the protruding edge portion 12c of the clamp finger 12 exists inside the outer diameter of the shoulder portion 16g of the inner cylinder 16. As a result, the disk can be exchanged through the clamp means without having to move the clamp means including the cap 14 and the clamp fingers 12 by a robot hand or the like.

When the air supply stops supplying air, the spring force of the coil spring 22 pushes the piston rod 20 down again, while the clamp washer 32 pushes down on the cap 14. Clamp finger 12 with it
Is the tapered portion 16 of the inner cylinder 16
e and the second cylindrical portion 16d slide and descend. Eventually, the clamp fingers 12 will be upright and the ridge 1
The protrusion 2c abuts on the disc 40. At this time, the lower end of the cap 14 contacts the edge of the clamp finger 12. The lower surface of the cap 14 presses the ridges 12c of each of the three clamp fingers 12 with a uniform and sufficient force, whereby the ridges of the ridges 12 are caused to protrude.
The flat surface near the inner diameter edge of the disk 40 is clamped by the surface contact with the top surface of the disk 8. In this way, the three clamp fingers 12 make surface contact with the plane near the inner diameter edge of the disk 40 over most of the area except for the spacing between the clamp fingers, so that the disk is prevented from being deformed during clamping and accurate. Enables measurement.

Although the preferred embodiments of the present invention have been described above, various modifications can be made without departing from the gist of the present invention.
It will be apparent to those skilled in the art that variations can be made. For example, the cylinder body of the clamp base 10 may be integrally formed without being divided into the inner and outer cylinders 16 and 18.

[0015]

According to the disk clamp device of the present invention, in the unclamped state, the projecting edge portion of the clamp finger is located inside the annular flat surface portion where the disk is arranged, and the disk can be attached and detached. Clamp in clamped state
Since the protruding edge of the finger contacts the flat surface near the inner diameter edge of the disk and the cap presses the protruding edge, it is not necessary to move the cap with the robot hand, and the hard disk is clamped by surface contact. can do.

[Brief description of drawings]

FIG. 1 is a perspective view showing a disc clamp device of the present invention.

FIG. 2 is an exploded perspective view of the device of the present invention.

FIG. 3 is a sectional view showing a clamped state of the device of the present invention.

FIG. 4 is a cross-sectional view showing an unclamped state of the device of the present invention.

[Explanation of symbols]

 12 Clamp / Finger 14 Cap Member 16, 18 Cylinder Member 20 Piston Member

Claims (1)

(57) [Claims] 1. An annular flat surface portion having a central through hole, which is perpendicular to the central through hole, a shoulder portion formed inside the annular flat surface portion, and an outer diameter of the shoulder portion connected to the shoulder portion. A cylinder member having a cylindrical portion with a smaller diameter and a tapered tip portion coupled to the cylindrical portion, in which the periphery of the center hole of the disk is arranged on the annular flat surface portion, and the center through hole of the cylinder member is vertically A slidable piston member, side portions each of which is located around the tip of the piston member, a projecting edge portion having a hook-like cross section that projects outward along the lower end of the side portion, and the side surface portion. A plurality of finger members each having a claw portion that is coupled to the upper end of the piston member and that is disposed at the tip of the piston member at a predetermined interval to support the side surface portion and the projecting edge portion, and a flat surface that is coupled to the tip end of the piston member. Outer diameter is slightly smaller than that of the shoulder and the shoulder A cap member having a cylindrical portion that surrounds side surfaces of the plurality of finger members, and when the piston member is at the upper limit position, the projecting edge portion of the finger member faces the tapered tip end portion of the cylinder member. When located at the inner side of the cap member and at the lower limit position, the protruding edge portion of the finger member is pressed by the lower end of the cap member, and the disc is sandwiched and fixed with the annular flat surface portion. A disc clamp device characterized in that