Browse Prior Art Database

Shift Sensitive with Interlocked Velocity Bail

IP.com Disclosure Number: IPCOM000087137D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Bushmiaer, WD: AUTHOR [+2]

Abstract

Depressing keylever 1 moves interposer 2 via dobber 3. When interposer 2 is moved in the direction of arrow 4 by filter bail (not shown), the left end 5 pushes on point 6 of dobber 7. As dobber 7 moves, it pushes on actuator 8 at point 9 causing actuator 8 to rotate counter-clockwise. End 10 of actuator 8 pushes on the underside of pad 11 on bellcrank 12 causing bellcrank 12 to rotate clockwise about pivot 13. The right end 14 of bellcrank 12 pushes downward on velocity bail shifter dobber 15, causing it to rotate about pivot 16. Dobber 15 is connected to velocity bail shifter 17 by spring 18 which is fastened to ear 19 on shifter 17. Ear 20 on velocity bail shifter 17 rests in a slot in velocity bail 21 keeping the bail in a certain left-to-right location in the typewriter when the keyboard is in the lower-case typing mode.

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Shift Sensitive with Interlocked Velocity Bail

Depressing keylever 1 moves interposer 2 via dobber 3. When interposer 2 is moved in the direction of arrow 4 by filter bail (not shown), the left end 5 pushes on point 6 of dobber 7. As dobber 7 moves, it pushes on actuator 8 at point 9 causing actuator 8 to rotate counter-clockwise. End 10 of actuator 8 pushes on the underside of pad 11 on bellcrank 12 causing bellcrank 12 to rotate clockwise about pivot 13. The right end 14 of bellcrank 12 pushes downward on velocity bail shifter dobber 15, causing it to rotate about pivot 16. Dobber 15 is connected to velocity bail shifter 17 by spring 18 which is fastened to ear 19 on shifter 17. Ear 20 on velocity bail shifter 17 rests in a slot in velocity bail 21 keeping the bail in a certain left-to-right location in the typewriter when the keyboard is in the lower-case typing mode.

When the shift keylever is depressed causing the above events to occur, it results in moving velocity bail 21 in the direction of arrow 22. In order to hold the velocity bail 21 in the operated position, edge 23 on latch 24 is pulled into notch 25 on dobber 7 by spring 26. This now holds the system in its operated position until the lower-case interposer is energized.

When keylever 1 is moving upward to its home position, it allows spring 27 to pull up on end of bellcrank 28 causing the other end of bellcrank 28 to move downward to trip down shift interposer 29. As interposer 29 is pushed in the ...