Toshiba e-studio550 Service Manual page 128

9. 3. 3. Paper separation
This model is equipped with a separation roller which
Feed roller
works to prevent multiple paper feeding. The sepa-
ration roller unit consists of the feed roller, separa-
tion roller, torque limitter, etc., as shown at right.
The feed roller is rotated by the feed clutch in the
direction of the arrow ( ) at the same timing as
the pick-up roller rotation.
The figure at lower right shows how duplicate feed-
Torque limitter
ing is prevented: Since the friction between two
sheets is small, the lower sheet is not transported
Separation roller
any further while the upper sheet is transported by
the feed roller in the direction of the arrow ( ).
[Example]
When only one sheet enters between the rollers:
Feed roller
Since the transporting force of the feed roller is
greater than the braking force of the separation roller,
the separation roller follows the feed roller, making
the sheet go forward to the registration roller.
A
When two sheets enter between the rollers at the
B
same time:
Since the transporting force of the feed roller and
the breaking force of the separation roller are greater
than the frictional force between two sheets, the pa-
per A is transported to the direction of the arrow
Separation roller
( ) and the paper B is braked by the separation
roller and is not transported any further.
JUNE 2002 © TOSHIBA TEC 9 - 5 e-STUDIO550/650/810 PAPER FEEDING SYSTEM