Printhead shifting for wear distribution

Details Printhead shifting for wear distribution Printhead shifting for wear distribution

1986-07-14

1988-04-26

Sewell, Paul T.

Typewriting machines

Including adjustment means to compensate for wear

400120, 400121, B41J 312

Patent

active

047400927

ABSTRACT:
Wear on the elements (5) of a printhead (3) is spread by shifting the region of use of the printhead line by line. Font (13) provides information as to whether any character in a line employs the upper three pels or the bottom three pels of a line. For each line which can be printed from different shift positions of the printhead, selection logic controls paper feed (15) to index platen (9) to the least used of a shifted position of printhead. Only those electrodes over the print line in each shifted position are used for printing. This distributes wear without requiring any special ribbon feed. The three pel height is at least as wide as the serifs on most characters, which avoids some electrodes being used for the serifs of given characters in more than one shift position.

REFERENCES:
patent: 4033444 (1977-07-01), Beery
patent: 4167342 (1979-09-01), Mower et al.
patent: 4247207 (1981-01-01), Klimek et al.
patent: 4467363 (1984-08-01), Tench, Jr.
patent: 4521123 (1985-06-01), Boehmer
patent: 4575731 (1986-03-01), Horlander
patent: 4625216 (1986-11-01), Brooks et al.
IBM Technical Disclosure Bulletin article entitled "Improving Life of Electrode Printhead" vol 27, No. 10B Mar. 1985 at pp. 5920-5921.

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