Position transducer for use with a printer or plotter

Advancing material of indeterminate length – By intermittent material-mover – Adjustable feeder

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Details

B65H 2000

Patent

active

048443174

ABSTRACT:
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 extension (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 (32) 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 retracted by a return spring (48) to their original position. 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.

REFERENCES:
patent: 4153190 (1979-05-01), Marion
patent: 4630071 (1986-12-01), Nakazawa

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