Hewlett-packard Development Company, L.P.

Jason Grosse

Rick Minoru Tanaka

Steven B Elgee

Christopher M Lesniak

Edward L Feldhousen

Beverly Loh

Disclosed are apparatus and methods for compensating for the change in length of an encoder strip due to environmental effects such as temperature and humidity. The apparatus and methods utilize two simple optical sensors spaced apart and mounted on a substrate having a different coefficient of thermal expansion than the encoder strip; the substrate is mounted to the movable component which is to be positioned, such as a printer carriage. Embodiments of the methods utilize information from the two sensors, in conjunction with information from the analog encoder used to position movable component, to compensate for environmental effects.

Apparatus and methods for compensation of thermal and hydroscopic expansion effects in a low cost motion control system

In one embodiment, a system and method pertains to detecting a position of a sheet of media that has been loaded onto the print surface, determining from the detected position a current loading error with which the media sheet has been loaded onto the print surface, and calculating a loading offset that can be used to adjust the position at which a future media sheet will be loaded onto the print surface.

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Vancouver, WA, United States of America

Jason Grosse