Typewriting machines – Including adjustment for optimum printing plane – Responsive to thickness of record-medium
Patent
1984-08-02
1986-04-08
Burr, Edgar S.
Typewriting machines
Including adjustment for optimum printing plane
Responsive to thickness of record-medium
400126, 101 35, B41J 1120
Patent
active
045809143
ABSTRACT:
A circuit and related method are provided for maintaining a desired spacing between an ink-jet printing means and a receiving surface along a line scanned by the printing means. An ultrasonic transducer transmits signals at timed intervals to the receiving surface from the printing means. A reflected signal from the receiving surface is sensed by the transducer during a receiving time window after the signal is transmitted. A reference position signal representative of the head to surface spacing at a printing location is compared to the desired head to surface spacing to produce a position error signal. A servomotor responds to the position error signal to move the printing means toward and away from the receiving surface to maintain the desired spacing.
REFERENCES:
patent: 3606162 (1971-09-01), Lehmann
patent: 3867882 (1975-02-01), Ahlgren et al.
patent: 4414792 (1983-11-01), Bettencourt et al.
patent: 4479433 (1984-10-01), MacPhee et al.
IBM Technical Disclosure Bulletin, "Paper Edge Sensing", by Smith, vol. 20, No. 3, Aug. 1977, p. 904.
Murray Jeffrey J.
Phelan Brian
Rich Leonard G.
Burr Edgar S.
Metromedia, Inc.
Weresh John A.
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