Apparatus and method for positioning an ink-jet printing head

Details Apparatus and method for positioning an ink-jet printing head Apparatus and method for positioning an ink-jet printing head

B - Operations, Transporting

41

J

101/96.0217

B41J 2/01 (2006.01) B41J 11/00 (2006.01) B41J 25/308 (2006.01)

Patent

CA 1251093

-24- APPARATUS AND METHOD FOR POSITIONING AN INK-JET PRINTING HEAD 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 re- ceiving 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.

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