Browse Prior Art Database

Case Shift with Spring Fuse

IP.com Disclosure Number: IPCOM000093530D
Original Publication Date: 1967-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Palmer, LE: AUTHOR [+2]

Abstract

Upper and lower case positioning of spherical type element 1 to present either of two hemispheres 2 or 3 in printing position relative to platen 4 is accomplished by displacement applied to tape 11. Character selection within a hemisphere 2 or 3 is provided by incremental pivotal motion of pulley arm 5. Each print operation is accompanied by a final positioning and securing of the element 1 by detent blade 6.

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Case Shift with Spring Fuse

Upper and lower case positioning of spherical type element 1 to present either of two hemispheres 2 or 3 in printing position relative to platen 4 is accomplished by displacement applied to tape 11. Character selection within a hemisphere 2 or 3 is provided by incremental pivotal motion of pulley arm 5. Each print operation is accompanied by a final positioning and securing of the element 1 by detent blade 6.

Case shift operation is controlled by key 7 which operates a self-restoring latch 8 of a half revolution clutch 9. Pin 10 on the output of clutch 9 is connected to one end of type 11. Rotation of the clutch output moves pin 10 between the two positions shown to displace tape 11 a put moves pin 10 between the two positions shown to displace tape 11 a predetermined amount representative of 180 degrees of motion of element 1. The throw of clutch 9 applied to tape 11 is adjustable by screws 15.

Pulley 12 is normally retained against adjustable stop 13 by stiff spring 14. Should clutch 9 be operated at a time when blade 6 prevents element 1 from rotating, the output of clutch 9 simply stretches spring 14 and avoids breakage of element 1 or tape 11.

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