Dot matrix printer having a print head position adjusting featur

Details Dot matrix printer having a print head position adjusting featur Dot matrix printer having a print head position adjusting featur

1991-01-31

1992-08-11

Burr, Edgar S.

Typewriting machines

Including adjustment for optimum printing plane

Responsive to thickness of record-medium

400 59, 400124, B41J 1120

Patent

active

051373777

ABSTRACT:
In dot impact printers, a platen or a print head may be thermally expanded or contracted due to heat generated from a driver of a print head, with the result that a gap between the print head and a sheet of print paper on the platent varies. In order to maintain a proper gap therebetween regardless of the thermal deformation of the platen and/or print head, a temperature sensor is provided for sensing the temperature of the platen or the print head, and the gap therebetween is adjusted based on the sensed temperature. This adjustment is performed each time when a number of printed characters have reached a predetermined number.

REFERENCES:
patent: 4652153 (1987-03-01), Kotsuzumi et al.
patent: 4877344 (1989-10-01), Watahiki et al.
patent: 4978239 (1990-12-01), Alexander et al.
patent: 4990004 (1991-02-01), Kawahara et al.
patent: 5017027 (1991-05-01), Koike
patent: 5037217 (1991-08-01), Suzuki et al.

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