Dual pitch impact printing mechanism and method

Printing – Selective or progressive – Bed and platen machines

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Details

101 9309, 101 9314, 400305, B41J 912

Patent

active

041529812

ABSTRACT:
An impact printer is provided which is capable of printing at either 10 characters per inch (standard pitch) or 15 characters per inch (compressed pitch) by changing the type character carrying member, such type carring member including multiple font character sets thereon. The type character carrying members or bands include timing marks thereon for detecting or sensing the type band (standard or compressed pitch), the type character font set, and for tracking the type characters on the band. The printer also includes time shared hammer means which are movable or shifted a precise distance of 1/10 inch for a standard pitch band or a precise distance of 1/15 inch for a compressed pitch band, such movement being operable by control mechanism responsive to pulses derived from the timing marks relative to the horizontal position mechanism and the type band on the printer (standard or compressed pitch).

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patent: 4055117 (1977-10-01), Munday
Mathers, "Point Element Pitch Selection, " IBM Technical Disclosure Bulletin, vol. 19, No. 6, 11/76, p. 1959.

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