Read Sharp AR-810 (serv.man13) Service Manual online
AR-651/810 PAPER FEEDING SECTION 9 - 5
9. 3. 3. Paper separation
This model is equipped with a separation roller which
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 the 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-
ing is prevented: Since the friction between two
sheets is small, the lower sheet is not transported
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:
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.
• When two sheets enter between the rollers at the
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 paper A is transported to the direction
of the arrow (
) and the paper B is braked by
the separation roller and is not transported any
further.
Feed roller
Separation roller
Torque limitter
Feed roller
Separation roller
A
B
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