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Browse Prior Art Database

Automated Shift

IP.com Disclosure Number: IPCOM000090730D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Abell, WA: AUTHOR

Abstract

Keyboard shift operation is automated to produce an automatic downshift after a single character is printed in upper case. Shift keylever 10, when depressed, activates upshift interposer 11. This is driven forwardly by filter shaft 12 and encodes a shift control signal through selective displacements of bails 13. Forward movement of interposer 11 also drives sliding latch 14 forwardly through bent tab 15 to a point beyond shift key latching surface 16 and print cycle latching surface 17. Forward movement of latch 14 lifts auxiliary keylever 18 against spring 19 to allow mechanical bypass member 20 to move into position for later actuation of downshift interposer 21. A printer connected to the output of the keyboard via reed switch members 22, operated by bail controlled shunts 23, is now in upper case.

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Automated Shift

Keyboard shift operation is automated to produce an automatic downshift after a single character is printed in upper case. Shift keylever 10, when depressed, activates upshift interposer 11. This is driven forwardly by filter shaft 12 and encodes a shift control signal through selective displacements of bails 13. Forward movement of interposer 11 also drives sliding latch 14 forwardly through bent tab 15 to a point beyond shift key latching surface 16 and print cycle latching surface 17. Forward movement of latch 14 lifts auxiliary keylever 18 against spring 19 to allow mechanical bypass member 20 to move into position for later actuation of downshift interposer 21. A printer connected to the output of the keyboard via reed switch members 22, operated by bail controlled shunts 23, is now in upper case. If pivoted latch 16 is lifted as by release of key 61, latch 14 is held only by latching surface 17 and the keyboard is conditioned for automatic downshift immediately following the next keyboard print cycle. Upon striking a character key, not shown, a keyboard interposer is driven forwardly and carries with it encoding bail 13a which is common to all printable characters. Bail 13a strikes tab 24 on latch 17 to lift such latch from holding engagement with tab 15. Latch 14 is thus free to move rearwardly and permit spring 19 to drive keylever 18 downwardly against interposer 21 to cause performance of a downshift keyboard cycle.

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