Lexmark C910 Service Manual page 90

5055-01X
Paper Registration Sequence
Paper is stopped at the hole punching position momentarily before
the paper standstill clutch turns ON and changes to open. At this
point the driving force cannot be transmitted to the register rollers.
The paper then stops at register rollers, and since the finisher keeps
feeding the paper from the host printer, the leading edge of the
paper stops at the register rollers. The paper buckles at the
entrance. The paper buckle feeds downward to the lower entrance
paper guide, where it is hole-punched at the leading edge. The
paper standstill clutch turns OFF and changes to close as the driving
force transmits to register rollers and the paper transportation
restarts.
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Service Manual