Media skew compensator
AssigneeInternational Business Machines Corporation
InventorDanny Allen Van Hook
Life of this patent
Estimating the term…
Abstract
A pair of detectors provide signals coincident with the circumferential and axial edges of a print medium mounted on a rotating media support drum. These signals are used to control counters which respond to an emitter circumferentially disposed with respect to the drum to generate a preset or offset signal value and a gate signal to accommodate axial and circumferential misalignment of the print medium on the drum.
Claims5
In a printer including a print media support and a plurality of print elements arranged to traverse the print media support in a first direction while the print media support moves cyclically in a substantially orthogonal second direction, circuit means for providing a signal indicative of the location of a print media mounted on the print media support comprising:
- first sensor means movable in conjunction with said print elements and providing a first signal upon detecting the first of two parallel print media edges;
- second sensor means fixed with respect to said media support for providing a second signal upon detecting the first of two parallel print media edges which are oriented substantially orthogonal to the edges sensed by the first sensor means;
- first means operating in synchronism with said media support for providing a fixed plurality of signal pulses in each cycle of media support movement;
- counter means responsive to said second signal for resetting under control thereof;
- second means responsive to said first means and the said first signal for providing stepping signals to the said counter means under control of said first means output and for discontinuing said stepping signals in response to said first signals;
- and,
- third means responsive to said second means for providing the attained counter value upon discontinuance of said stepping signals as a preset output indicative of the skew of the media edges with respect to the media support.
Dependencies are inferred from the claim text.