Browse Prior Art Database

Mechanical Logic Device

IP.com Disclosure Number: IPCOM000079686D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Abell, WA: AUTHOR [+4]

Abstract

This mechanism is useful to select the erase functions such as ribbon lift, ribbon feed, and space inhibit, as described in French patent 1,408,550 and U. S. Patent 3,724,633 in a typewriter like that disclosed in U. S. Patent 3,618,736, where backspace is achieved by rotation of a print shaft. Output link 10 thus is connected to the erase function desired. Pulse input 16 indicates selection of an erase operation. Input pulse 25 is generated during backspace and other nonprint cycles, such that only a printing cycle will cause performance of the erase functions.

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Mechanical Logic Device

This mechanism is useful to select the erase functions such as ribbon lift, ribbon feed, and space inhibit, as described in French patent 1,408,550 and U. S. Patent 3,724,633 in a typewriter like that disclosed in U. S. Patent 3,618,736, where backspace is achieved by rotation of a print shaft. Output link 10 thus is connected to the erase function desired. Pulse input 16 indicates selection of an erase operation. Input pulse 25 is generated during backspace and other nonprint cycles, such that only a printing cycle will cause performance of the erase functions.

Output link 10 is moved cyclically by spring 11 under control of cam 12, if ledge 13 of control arm 14 is displaced leftwardly out of the path of end 15 of output link 10. Control arm 14 is displaced leftwardly temporarily by any suitable pulse input, such as pneumatic actuator 16. Spring biased latch element 17 is pivotally supported on output link 10 and moves upwardly into notch 18 of control arm 14, to retain control arm 14 in its leftwardly displaced position. As output link 10 pivots counterclockwise following cam 12, its end 15 passes ledge 13 before tab 19 drags latch 17 downwardly out of notch 18, and output motion of link 10 is accomplished. Link 10 is restored to its original position by cam 12, thus completing an operating cycle.

Output motion of link 10, as described above, can be inhibited for one or more cycles by supplementary control link 20. This link is retained...