Paper Feeding Section - Toshiba 4560 Service Manual

8

PAPER FEEDING SECTION

8.1 Functions
This unit sends paper which is set in the paper cassette or on the bypass tray to the transfer position.
The paper feeding section is mainly comprised of manual feed roller, pick-up rollers, paper feed rollers,
separation rollers, transport rollers, aligning roller, manual feed switch, paper empty switch, paper size
switch, paper feed switch, paper stop switch and also their drive mechanisms.
The following explains each part function.
(1) Pick-up roller/manual feed roller
Sends paper in the bypass tray or the paper cassette to the paper feed roller and the roller moves up
and down on each occasion of paper feeding.
(2) Paper feed roller
This is the opposite of the separation roller, sending paper fed from the pick-up roller to the transport
roller.
(3) Separation roller
This is the opposite of the paper feed roller. When two sheets or more are fed from the pick-up roller,
the load of the torque limiter of the separation roller is greater than the friction power between the
sheets of paper, the separation roller stops, causing the lower sheet also to stop and not be fed at
that moment. But in the case of single sheet feeding, it rotates at the same timing as the paper feed
roller so that it has the rotation force of that roller.
(4) Transport roller
Transport the paper from the feed roller to the aligning roller.
(5) Aligning roller
Paper fed from the paper feed roller is stuck against the aligning roller which is at rest, and leading
edge alignment is performed.
Then the aligning roller rotates to feed paper to the developing position.
Further, the aligning roller is contacted with the brush to prevent paper dust from adhering to the
aligning roller due to paper alignment.
The following explains about switches which detect paper size, paper presence and paper feeding posi-
tion for ON/OFF control of each roller.
(6) Manual feed switch
Detects if paper is set in the bypass tray. If this is the case, manual paper feeding has priority over
cassette paper feeding.
(7) Paper empty switch
This sensor detects paper in the paper cassette by the use of the actuator. When there is no paper in
the cassette, the actuator intercepts the transmitted light in the sensor, causing a paper-empty situ-
ation to be detected.
Nov. 1997 © TOSHIBA 8 - 1 4560/4570 FEEDER