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Browse Prior Art Database

Backspacing Mechanisms

IP.com Disclosure Number: IPCOM000090676D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Wehmer, BF: AUTHOR

Abstract

The mechanisms provide manual reversing of a lead screw in a dictating unit a predetermined distance relative to the pitch of the recorded track on a magnetic belt media. Sound head 1 is driven as indicated by arrow 2 across media 3, such as a magnetic belt, that is moved as indicated by arrow 4 by a drive not shown. The combined movements result in the tracing of a helical path on media 3. Head 1 is driven by engagement of pawl 5 with lead screw 6 rotated as indicated by arrow 7. Slideable gear rack 8 is in mesh with idler gear 9 which is provided with ratchet teeth on one face. Light spring 10 thrusts the gear against retaining ring 11 on lead screw 6. Clutch 12 is slideably keyed to lead screw 6 by pin 13 and slot 14.

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Backspacing Mechanisms

The mechanisms provide manual reversing of a lead screw in a dictating unit a predetermined distance relative to the pitch of the recorded track on a magnetic belt media. Sound head 1 is driven as indicated by arrow 2 across media 3, such as a magnetic belt, that is moved as indicated by arrow 4 by a drive not shown. The combined movements result in the tracing of a helical path on media 3. Head 1 is driven by engagement of pawl 5 with lead screw 6 rotated as indicated by arrow 7. Slideable gear rack 8 is in mesh with idler gear 9 which is provided with ratchet teeth on one face. Light spring 10 thrusts the gear against retaining ring 11 on lead screw 6.

Clutch 12 is slideably keyed to lead screw 6 by pin 13 and slot 14.

Clutch 12 has a single ratchet tooth 15 at one end and another tooth 16 on the opposite end for alternate engagement with either face ratchet of gear 9 or either one of two notches 17 and 17a, 180 degrees apart, of gear 18. This is driven through a gear train in synchronism with the media drive roller. With clutch 12 in position as shown, gear 18 is free to idle on the lead screw extension. Spring 19 through clutch yoke 20 maintains engagement of clutch 12 with gear 18. Cam 21 is a yieldable member of rack 8. Cam 21 has sufficient stiffness to shift clutch 12, by means of spring 19 biasing yoke 20 from engagement with gear 9, into engagement with gear 18 when rack 8 is pulled in the indicated direction. Gear 9 yields in cas...