Typewriting machines – Including adjustment for optimum printing plane
Patent
1994-03-10
1995-08-29
Burr, Edgar S.
Typewriting machines
Including adjustment for optimum printing plane
400 56, 400 57, B41J 1120
Patent
active
054454581
ABSTRACT:
An automatic platen gap adjusting apparatus is provided with (i) a stepping motor for moving a carriage provided with a recording head in the direction of a platen, (ii) a rotary encoder for producing a plurality of pulse signals proportional to the rotational speed of the motor, the rotary encoder being equipped with a detection mark on its circumference, (iii) a time difference integrating device for obtaining the integrated value of the time difference between the pulse signal from the rotary encoder and the driving pulse of the stepping motor, while moving the carrier from a reference position in the direction of the platen, and (iv) an abutment decision device for detecting whether the value thus obtained has reached a predetermined value. The thickness of the paper is calculated by a paper thickness calculation device according to the number of pulses produced up to the moment the signal is produced from the abutment decision device. The apparatus of the present invention can automatically adjust the relative gap between the platen and the recording head with precision while preventing press marks from appearing on the paper.
REFERENCES:
patent: 4676675 (1987-06-01), Suzuki et al.
patent: 4861175 (1989-08-01), Hori et al.
patent: 4881835 (1989-11-01), Niikawa
patent: 4990004 (1991-02-01), Kawahara et al.
patent: 5156464 (1992-10-01), Sakai
Burr Edgar S.
Hilten John S.
Seiko Epson Corporation
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