Adjustable optical shaft encoder and calibration method for prin

Details Adjustable optical shaft encoder and calibration method for prin Adjustable optical shaft encoder and calibration method for prin

1989-04-24

1990-11-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

226 45, G01D 534

Patent

active

049688820

ABSTRACT:
An apparatus such as a printer or a plotter feeds image-receiving media such as paper by rotation of a shaft, and a media position sensor responds to the rotation of a sensor roller. The apparatus includes a position sensor calibration device having an elastically deformable ring compressible between the shaft and the sensor roller and a calibrator for changing the distance between the shaft and the sensor roller so as to change the amount by which the deformable ring is compressed, in order to adjust the output of the media position sensor for a given amount of media movement. The shaft is connected to one of a pair of media-gripping pinch rollers, the one pinch roller being rotatable by the shaft, and a shaft motor is connected to the shaft. The ring is pinched between the shaft and the sensor roller. The calibrator is a screw threaded through a stationary threaded support and extending toward the sensor roller to push the roller toward the shaft and compress the elastically deformable ring. The response of the media position sensor is calibrated by rotating the screw.

REFERENCES:
patent: 4293774 (1981-10-01), Pongracz
patent: 4513898 (1985-04-01), Spitsbergen

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