Overload protected rack and pinion drive for an optical scanning

Details Overload protected rack and pinion drive for an optical scanning Overload protected rack and pinion drive for an optical scanning

1988-10-13

1991-06-18

Shoop, Jr., William M.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Having power driven transducer assembly

369215, 369220, G11B 1730

Patent

active

050253719

ABSTRACT:
A slide (19) is driven by a gear mechanism (21) to position a scanning device (15) in a radial direction relative to the record carrier between an innermost track 3) and an outermost track (4), a stop (38) of the slide (19) abutting against a fixed stop (39) on the apparatus when the scanning device (15) is positioned at the outermost track (4). The gear mechanism (21) comprises a pinion (24) driven by a motor (20) and two gear racks (26, 27) which are tensioned relative to one another by a spring (25) and driven by the pinion, one of the gear racks (27) being fixed to the slide (19). When the slide (19) abuts against the fixed stop (39) the gear rack (27) is not in mesh with the pinion (24) and at least one end tooth (40) of the other gear rack (26) is situated in a range where it can mesh with the pinion (24). The spring (25) holds the slide (19) against the stop (39) and urges the other gear rack (26) towards the pinion (24), thus providing overload protection for the motor (20) and the gear mechanism (21).

REFERENCES:
patent: 2278678 (1942-04-01), Stone
patent: 4351046 (1982-09-01), Elliott
patent: 4442516 (1984-04-01), Funabashi
patent: 4831615 (1989-05-01), Goto et al.

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