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Precision Assembly of Disk File

IP.com Disclosure Number: IPCOM000044266D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 3 page(s) / 48K

Publishing Venue

IBM

Related People

MacWilliams, D: AUTHOR

Abstract

A vacuum-operated gripper, for use in the precision assembly of disks and disk spacer rings on a hub of a disk file, has a vertically compliant axial probe around which are concentrically disposed a number of equally-spaced vertically compliant fingers arranged in a circle, the diameter of which is just less than the internal diameter of a disk or a spacer ring. During pick-up, the fingers are inserted into the internal diameter of the disk or spacer ring, thereby ensuring concentricity with the axial probe of the gripper. During subsequent placement of the disk or spacer ring, the gripper takes its positional reference with respect to the disk file hub by inserting the axial probe into an accurately machined center hole in the hub itself.

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Precision Assembly of Disk File

A vacuum-operated gripper, for use in the precision assembly of disks and disk spacer rings on a hub of a disk file, has a vertically compliant axial probe around which are concentrically disposed a number of equally-spaced vertically compliant fingers arranged in a circle, the diameter of which is just less than the internal diameter of a disk or a spacer ring. During pick-up, the fingers are inserted into the internal diameter of the disk or spacer ring, thereby ensuring concentricity with the axial probe of the gripper. During subsequent placement of the disk or spacer ring, the gripper takes its positional reference with respect to the disk file hub by inserting the axial probe into an accurately machined center hole in the hub itself. As the gripper is lowered towards the hub, the compliant probe and fingers retract after contact with the hub, permitting the disk or spacer ring carried by the gripper to be lowered onto the hub without risk of jamming.

Fig. 1 shows a part of a section through the gripper having picked up a disk 1 from a stacker. The gripper consists of a cylindrical body 2 having a central bush 3 with an axial bore 4. A probe 5, supported in the axial bore by linear bearings 6, is biased downward from the bore by a spring 7 which provides the probe with its upward vertical compliance. An annular ring 8 having three downwardly extending equally spaced fingers 9 (only one visible) is provided concentric with the probe. The ring is attached to three spindles 10 supported in correspondingly positioned bores 11 through the gripper body by linear bearings 12. A spring 13 on each spindle, biases the fingers downward and provides the fingers with their upward vertical compliance. The leading edges 14 of the fingers are relieved, to aid their insertion into a disk or spacer ring. The external lower surface 15 of the gripper body is accurately machined flat and provided with an annular groove 16 to serve as a vacuum plenum. Drilled airways (not shown) through the body are provided to connect the plenum to a suitable vacuum source. To reduce leakage between the gripper and a disk or spacer ring, a po...