Apparatus for automatically adjusting a gap between a platen and

Details Apparatus for automatically adjusting a gap between a platen and Apparatus for automatically adjusting a gap between a platen and

1989-01-27

1990-04-17

Eickholt, Eugene H.

Typewriting machines

Including adjustment for optimum printing plane

Responsive to thickness of record-medium

400708, 226 45, 271263, B41J 1120

Patent

active

049175122

ABSTRACT:
A mechanism for automatically adjusting the gap between the platen and print head of a printer includes a paper thickness lever detecting lever pivotably mounted on the printer base so that one end selectively contacts the surface of the platen. The opposite end of the lever contacts a pressure sensitive conductive member or adjusts the amount of light striking a photosensitive member of a paper thickness detector to generate an initial signal. After paper is fed onto the platen the lever contacts the surface of the paper and the paper thickness detector generates a second paper thickness signal corresponding to the different position of the lever. A carriage control circuit receives this signal and controls a print head carriage guide to adjust the relative position between the carriage and the platen to provide a suitable distance for printing.

REFERENCES:
patent: 4088215 (1978-05-01), Bader
patent: 4354766 (1982-10-01), Hendrischk et al.
patent: 4632577 (1986-12-01), Brull et al.
patent: 4652153 (1987-03-01), Kotsuzumi et al.
patent: 4676675 (1987-06-01), Suzuki et al.
patent: 4702629 (1987-10-01), Hamano et al.
patent: 4720200 (1988-01-01), Gomoll et al.
Carpenter et al., "Forms Sensor for Automatic Platen", IBM Tech. Discl. Bulletin, vol. 13, No. 12, p. 3643, 5-71.
Frechekle, "Automatic Impression Control", Xerox Disclosure Journal, vol. 1, No. 7, p. 31, 7-76.

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