User manual

95.08.23.11.30
Color LaserWriter 12/600 PS Basics & Theory 1–92
Multifeed
Prevention
Mechanism
For cassette feeding, the printer uses the separation roller to prevent
multifeeding. Normally, the separation roller is given rotational force
reverse that of the feed roller. However, since the separation roller is
equipped with a torque limiter, it rotates with the feed roller by trans-
mission of its rotational force via the transported paper. If multiple
sheets of paper are picked up, the low friction force between those
sheets results in a weak rotational force being transmitted to the separa-
tion roller from the feed roller. As a result, the separation roller’s own
rotational force separates the extra sheet.
Rotational force transmitted from feed roller.
Rotational force transmitted from pickup motor via torque limiter.
Rotational force of feed roller.
Paper feed direction.
Paper
Feed Roller 1
Separation Roller
Torque Limiter
Pickup Roller
Feed Roller 2
Multiple feed
Normal Feed
Paper
Separation roller
Feed roller
Rotational force
transmitted from
feed roller
Rotational force
transmitted from
pickup motor
via torque limiter.