Paper size detection using ultrasound

Details Paper size detection using ultrasound Paper size detection using ultrasound

1999-03-25

2000-11-14

Chapman, John E.

Measuring and testing

Sheet, woven fabric or fiber

73597, 347106, 271 906, G01S 1114, B65H 702

Patent

active

061453765

ABSTRACT:
A detection system for detecting the size of a print medium. A hollow tube is positioned adjacent the paper or print medium. An ultrasonic transducer apparatus launches pulses of ultrasonic energy into the tube, and is responsive to ultrasonic echoes of the pulses to convert echo pulse energy into electrical detected signals. A flag positioning apparatus selectively positions a blocking flag within the tube at a location spaced from the transducer apparatus which is indicative of a print medium size. A controller responds to the electrical detected signals to determine a print medium size. The flag positioning apparatus can provide a single flag movable along a longitudinal extent of the tube, or a set of flags spaced along the longitudinal extent, one or more of which are selectably deflected by the print medium.

REFERENCES:
patent: 4108427 (1978-08-01), Komori et al.
patent: 5606430 (1997-02-01), Morikawa et al.
patent: 6039481 (2000-03-01), Ham

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