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Carrier Return Printing Interlock

IP.com Disclosure Number: IPCOM000093990D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Van Avery, CN: AUTHOR

Abstract

Interlocks are provided between carrier return and printing operations and vice versa in an electric typewriter. When carrier return keylever 10 is depressed, latch surface 11 of carrier return interposer 12 moves below latching plate 13. Interposer 12 moves to the rear and pivots spring-biased lever 14 to the left. At the same time, the lower end of keylever 10 engages bellcrank 16 mounted on rod 17. Bellcrank 16 and rod, 17 are rotated counterclockwise to position latch member 18 in front of cycle clutch trip lever 19. The mechanism is maintained in this condition by latching member 20 which pivots beneath bell crank 16. At this time lever 19 cannot be actuated in response to depression of a character keylever and printing is prevented.

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Carrier Return Printing Interlock

Interlocks are provided between carrier return and printing operations and vice versa in an electric typewriter. When carrier return keylever 10 is depressed, latch surface 11 of carrier return interposer 12 moves below latching plate 13. Interposer 12 moves to the rear and pivots spring-biased lever 14 to the left. At the same time, the lower end of keylever 10 engages bellcrank 16 mounted on rod 17. Bellcrank 16 and rod, 17 are rotated counterclockwise to position latch member 18 in front of cycle clutch trip lever 19. The mechanism is maintained in this condition by latching member 20 which pivots beneath bell crank 16. At this time lever 19 cannot be actuated in response to depression of a character keylever and printing is prevented.

As the carrier moves to the left margin and into the overbank region, plate 21 picks up lever 22 and pivots lever assembly 23 about pivot point 24. Pawl 25 is moved from stop 26. As plate 21 moves back from the overbank region, pawl 25 engages and pivots crank 27. One end of crank 27 engages and moves member 20 so that bell crank 16 can return to its initial position. Lever 14 moves to the right behind member 20. The mechanism is now ready for another cycle of operation.

When a printing operation is initiated, lever 19 is moved to a position where it prevents rotation of member 18. As a consequence, a carrier return operation cannot be started while the cycle clutch is energized.

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