Textiles: fiber preparation
Patent
1975-06-23
1976-10-26
Burr, Edgar S.
Textiles: fiber preparation
197151, 197181, B41J 1962, B41J 3302
Patent
active
039878856
ABSTRACT:
A method and mechanism for automatic actuation of single and repeat typewriter functions such as backspacing upon the insertion and removal of a ribbon cartridge. The ribbon cartridge, carrying a bidirectional camming abutment having a pair of converging cam surfaces is inserted into the typewriter, whereupon a first cam surface engages a backspace coupled cam lever within the typewriter, thereby actuating a typewriter backspace function. The cam lever includes a pair of convergingly directed cam surfaces joined by a dwell surface. As the cartridge camming abutment contacts the dwell surface, it actuates a repeat backspace function until the camming abutment passes beyond the dwell surface of the cam lever. The camming abutment includes a second cam surface that engages a second cam surface disposed on the cam lever to actuate a backspace function upon removal of the ribbon cartridge. Particularly adaptable to correcting typing errors, the present invention will minimize the manipulations now necessary to perform an error correcting operation. Therefore, an automatic single or repeat typewriter backspace function is actuated simply by inserting and removing a ribbon cartridge during an error correcting operation.
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Burr Edgar S.
Klem Stanley J.
SCM Corporation
Sewell Paul T.
Wolson Milton M.
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