Browse Prior Art Database

Cartridge Registration Device

IP.com Disclosure Number: IPCOM000086115D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 4 page(s) / 64K

Publishing Venue

IBM

Related People

Wheeler, SE: AUTHOR

Abstract

This registration device allows simple, repeatable registration of a clamshell type cartridge 1 for a magnetic disk in a disk drive machine. The registration is done mechanically (thus eliminating electrical logic) and provides a machine interlock for cartridge insertion/removal.

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Cartridge Registration Device

This registration device allows simple, repeatable registration of a clamshell type cartridge 1 for a magnetic disk in a disk drive machine. The registration is done mechanically (thus eliminating electrical logic) and provides a machine interlock for cartridge insertion/removal.

Cartridge 1 houses magnetic disk 5 and has outwardly swingable cover parts 4 and 4a to expose disk 5 to a read/write head 10, when cartridge 1 is fully inserted into the machine. Cartridge 1 must be accurately and repeatably registered or aligned in two directions simultaneously, in order to ensure proper data integrity when using head 10 for either magnetically reading or writing with respect to disk 5.

Clamshell cartridge 1 is machine loaded in direction 2 onto rails 20 which are attached to wedges 3. Wedges 3 act to open cover portions 4 and 4a of cartridge 1 exposing disk 5, registration edges 6 and registration edge 8 which is merely one side of cartridge 1. To function properly, registration edges 6 and 8 must be in contact simultaneously, respectively, with registration block 7 and registration surface 9, both of which are integrally mounted or incorporated (in a known position with respect to magnetic head 10) in the machine main frame of which rails 20 are parts. This allows different cartridges 1 and thus disks 5, to be aligned to the same reference point with respect to the read/write head 10, thereby ensuring interchangeability of cartridges 1 within one disk drive machine without loss of data.

The registration device may be broken down into two separate functional areas which are physically connected, one to register cartridge 1 against surface 7, and the other to register cartridge 1 against surface 9. In Fig. 2, a shaft 11 permanently mounted in the machine main frame, not shown, has located on it a thin sheet metal stamping 12 which is free to rotate. Stamping 12 is equipped with a torsion or similar spring 13 which will act to move it into its normal unloaded position (shown dotted). To activate this stamping and register the cartridge 1 against surface 7, another shaft 14, which is rotatably mounted in the machine frame, is equipped with a cam 15 whose unloaded or normal position is shown dotted in Fig. 2. A manually operable hand wheel or lever 16 located outside the machine is connected with cam 15.

To register a cartridge 1 against surface 7, cartridge 1 is inserted into the machine (inspection of the figures will show that insertion is impossible unless the mechanism has been placed in the dotted position by the operator due to blockage of cover part 4 by form 19), and hand wheel 16 is rotated counterclockwise as seen in Fig. 2 causing cam 15 to move stamping 12 toward one cover part 4 of cartridge 1. Wheel 16 is turned until the end of cam 15 drops into a shallow formed indentation 17 in stamping 12. Another section 18 of stamping 12 acts as a stop for cam 15 preventing overtravel. This camming action w...