Specifications

C-6
PagePro25
(3) 1st Cassette Paper Near Empty Sensor (PC5)
This sensor detects the paper near empty status of the 1st cassette paper. The sensor uses a photointerrupter. As the
sheets of paper in the paper cassette decrease, the paper lifting plate in the paper cassette lifts. When the paper lifting
plate lifts exceeding a certain point, the 1st cassette paper near empty occurs.
When enough paper is present in the paper cassette, the paper lifting plate is lowered. In this condition, the lower part of
the sensor arm is engaged with the photointerrupter. Thus, the light from the LED of the photointerrupter is blocked by the
sensor arm and the photointerrupter turns OFF. As a result, the output of the photointerrupter is “H”.
When the remainder of paper decreases, the upper part of the sensor arm is pressed by the paper lifting plate and the
lower part of the sensor arm comes off the photointerrupter. Thus, the light from the LED passes in the photointerrupter
and the photointerrupter turns ON. As a result, the output of the photointerrupter is “L”.
(4) Double Feed Sensor
The double feed sensor is on the double feed detecting sensor board (PWB-H) and detects the possibility of double feed.
This sensor uses a photo reflector.
The double feed sensor detects whether the leading edge of paper to be taken up next runs 10 mm or more from the
paper nip point. If paper runs 10 mm or more, double feeding may occur if the paper is taken up in the normal printing
interval. To avoid this, the printer prolongs the printing intervals as long as the double feed sensor detects the double feed
status. Thus, the number of sheets to be fed per minutes will be reduced.
When the leading edge of the paper to be taken up next runs 10 mm or more, the light emitted from the LED of the double
feed sensor is reflected by the paper. The reflected light is received by the light sensitive element of the sensor and the
sensor output is “L”.
When the running is less than 10 mm, the light emitted from the LED is not reflected by the paper and the sensor output
is “H”.
1st Cassette Paper Near
Empty Sensor (PC5)
Light passes:
Output = L
Paper
Light is blocked:
Output = H
[Paper is present.]
[Paper near empty]
Paper Lifting Plate
Few paper
Paper Lifting Plate
Paper
Double Feed Sensor
Paper Take-up Roller
Light reflects:
Output = L
Light does not reflect:
Output = H