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Original Feed and Separation Mechanism
A feed belt [A] and ADF separation roller [C] comprise the FRR original separation mechanism.
If more than one original feeds between the nip of the feed roller and ADF separation roller, when the pick-up roller [B] picks up the front edge of the original, the rotation of the ADF separation roller [C] reverses immediately.
This sends the bottom sheet back into the tray while the sheet above continues to feed normally.
When more than one original feeds, this increases torque above the limit of the spring loaded torque limiter which reverses the rotation of the ADF separation roller against the rotation of the feed belt above.
The bottom sheet reverse feeds while the sheet above continues to feed into the paper path.