Signal controlled indexing rate shifter for a typewriter

Details Signal controlled indexing rate shifter for a typewriter Signal controlled indexing rate shifter for a typewriter

B - Operations, Transporting

41

J

197/90

B41J 19/76 (2006.01) B41J 11/32 (2006.01) B41J 11/36 (2006.01) B41J 13/03 (2006.01) B41J 25/14 (2006.01)

Patent

CA 1122147

SIGNAL CONTROLLED INDEXING RATE SHIFTER FOR A TYPEWRITER Abstract An indexing mechanism for a typewriter provides a signal controlled transfer to a fast paper advance rate, say for semi-automatic paper insertion, while storing the last operator-selected rate. Two cams are employed which influence, through a follower, the engagement point of a pawl of a pawl and ratchet platen drive. One cam is operator positionable to change the portion of its cam profile that is tracked by the follower and, attendantly, the paper advance rate. By arranging a signal-controlled actuator to deflect the positionable cam from operative engagement with the follower, the other cam, which has a less prominent profile, is enabled to influence the pawl engagement point and provides high speed paper advance. Upon removal of the actuator signal the positionable cam is automatically returned to its operative position i.e., the last operator selected position. LE9-78-019

331158

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