Continuous form printer having multiple feed sensors and method

Details Continuous form printer having multiple feed sensors and method Continuous form printer having multiple feed sensors and method

1994-11-14

1996-10-15

Hilten, John S.

Typewriting machines

Sheet or web

Including programmed-control-system for record-medium feed

400583, 400707, B41J 1142

Patent

active

055648452

ABSTRACT:
A continuous form printer is provided with two rotary encoders, corresponding to different paper feed intervals, and mounted coaxially on a drive shaft. The drive shaft drives a tractor for feeding the paper. The rotary encoders are read by photo-interruptor sensors, and the sensor signals are selected by a selector. The selector is able to select either one of the sensor signals generated by the encoders, or a signal formed by performing an AND operation on the two sensor signals. A controller controls a motor driving the drive shaft according to the selected signal, the selected signal corresponding to a chosen feeding interval. The controller is further able to precisely adjust the leading edge of the paper to a predetermined position based on the selected sensor signal, a known paper length, and a paper top sensor.

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