Apparatus for detecting presence or absence of recording medium

Details Apparatus for detecting presence or absence of recording medium Apparatus for detecting presence or absence of recording medium

1989-06-19

1990-09-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250561, G01N 904

Patent

active

049580698

ABSTRACT:
An apparatus for detecting the presence or absence of a recording medium in a printer includes a photo-electric sensor, a reference determining device, a memory, and a judging device. The photo-electric sensor is disposed adjacent to a predetermined position in a feeding path of the printer. In a reference setting mode, the reference determining device determines a reference based on an output signal generated by the photo-electric sensor. The determined reference is stored in the memory. In a printing mode, the judging device compares the output signal of the photo-electric sensor with the reference, and judges whether or not the recording medium is present at the predetermined position.

REFERENCES:
patent: 4484070 (1984-11-01), Inoue
patent: 4571055 (1986-02-01), Nishiyama
patent: 4639607 (1987-01-01), Brandner
patent: 4641272 (1987-02-01), Sasaki et al.
patent: 4650991 (1987-03-01), Croset et al.
patent: 4667113 (1987-05-01), Nakajima et al.
patent: 4727437 (1988-02-01), Mizoguchi

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