Toshiba e-studio550 Service Manual page 125

(1) Pickup roller
These rollers draw out paper from the bypass tray, cassette or tandem LCF and send it to the feed
roller.
(2) Feed roller
This roller is placed against the separation roller. It transports paper from the pickup roller to the
transport roller.
(3) Separation roller
This roller is placed against the feed roller. When two or more sheets of paper are sent from the pickup
roller, the load of the torque limiter of the separation roller is greater than the frictional force between the
sheets of paper. As the result, the separation roller is stopped and the lower paper is not advanced any
further. When only one sheet of paper is sent from the pickup roller, the separation roller rotates following
the feed roller.
(4) Transport roller
This roller transports the paper sent from the feed roller to the registration roller.
(5) Registration roller
The paper sent from the transport roller is pushed against the registration roller which aligns ths leading
edge of paper. Then the registration roller rotates to transport the paper to the transfer section.
(6) Bypass feed sensor
This sensor detects if paper is set in the bypass tray. If it is, bypass feeding always comes before
cassette feeding.
(7) Cassette empty sensor
This is an emission type sensor and detects the availability of paper in the cassette by using an
actuator. When there is no paper in the cassette, the actuator blocks the light path of the sensor, and
the sensor determines that there is no paper.
(8) Feed sensor, Transport sensor
Feed sensor detects if the leading edge or trailing edge of paper passed the feed roller. Transport
sensor detects if the leading edge or trailing edge of paper passed the transport roller. They also
detects jams like misfeeding.
(9) Registration sensor
This sensor detects that the leading edge of paper has reached the registration roller and the trailing
edge of paper has passed the registration roller.
e-STUDIO550/650/810 PAPER FEEDING SYSTEM 9 - 2 JUNE 2002 © TOSHIBA TEC