Automatic single and repeat function mechanism for typewriters

Details Automatic single and repeat function mechanism for typewriters Automatic single and repeat function mechanism for typewriters

B - Operations, Transporting

41

J

197/106, 197/115

B41J 19/62 (2006.01) B41J 29/36 (2006.01) B41J 31/10 (2006.01) B41J 33/02 (2006.01)

Patent

CA 1052721

AUTOMATIC SINGLE AND REPEAT FUNCTION MECHANISM FOR TYPEWRITERS ABSTRACT OF THE DISCLOSURE 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 con- verging 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 sur- faces joined by a dwell surface. As the cartridge camming abut- ment contacts the dwell surface, it actuates a repeat backspace function until the camming abutment passes beyond the dwell sur- face 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 neces- sary 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.

254333

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