Position transducer for use with a printer or plotter

Details Position transducer for use with a printer or plotter Position transducer for use with a printer or plotter

B - Operations, Transporting

41

J

341/99, 101/96.0

B41J 11/42 (2006.01) G01D 9/40 (2006.01) G01D 15/28 (2006.01)

Patent

CA 1300969

POSITION TRANSDUCER FOR USE WITH A PRINTER OR PLOTTER ABSTRACT OF THE DISCLOSURE A rigid link is provided between a plot medium (14) and a position transducer (50) so that accurate plot medium advance measurement can be attained. The device (30) comprises a movable carriage (42) and an arm-like exten- sion (38) that juts out from the carriage to the plot medium. A friction hold is made between the extension arm and the plot medium by applying a force to the extension arm normal to the plot medium by means of an electromagnet (33) which includes a coil (34), the extension arm serving as the armature. The electromagnet is located beneath the platen (12) which supports the medium on a base (82) which also supports the carriage. With the electromagnet activated, the extension arm is held against the plot medium. As the plot medium is advanced by a plot medium drive system (20), the extension arm and carriage are pulled along. Plot medium advance is stopped when the proper advance distance has been sensed by the position transducer. The electromagnet is then deactivated and the extension arm and carriage are re- tracted by a return spring (48) to their original posi- tion. The process can then be repeated for the next plot medium advance. The length of a single move is short but sufficient for a scanning type plotter or printer.

564140

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