Apparatus and method for controlling the positioning of marking

Typewriting machines – Having power-driven operator for plural functions

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Details

400 55, 4001442, 400212, B41J 130

Patent

active

048939501

ABSTRACT:
A serial impact printer and including a single cam member for properly establishing and maintaining the throat gap distance between a character imprinting surface and the platen at a print point and for raising and lowering a selected ribbon, of a composite marking correcting ribbon pack assembly, to and from the print point. A short throat gap distance is needed for commercially acceptable printing speeds in this hammer mass printer, and is needed for high quality printing; conversely, a long throat gap distance is needed for print point visibility at all other times. The cam member has plural camming surfaces which coordinate ribbon position with throat gap distance.

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