11.2 PAPER FEED MECHANISM [A153/A155/A156]
11.2.1 Drive Mechanism
Each paper feed unit consists of a pick-up roller [A], feed roller [B],
separation roller [C], relay roller [D], pick-up solenoid [E], separation solenoid
[F], paper upper limit sensor [G], and paper end sensor [H].
The pick-up, feed and separation rollers are driven by the main motor via the
timing belt [I] and the paper feed clutch [J]. The relay roller is also driven by
the main motor. However, drive is transmitted to the relay roller via the relay
clutch [K] and the timing belt [L].
In standby mode, the separation roller is away from the feed roller.
At 50 ms after the Start key was pressed, the main motor and the separation
roller solenoid of the selected paper feed station turn on. Then the
separation roller contacts the feed roller.
At 100 ms after the main motor started to rotate, the pick-up solenoid turns
on. The pick-up roller lowers to make contact with the top of the paper stack.
The pick-up solenoid stays on for 314 ms.
At 200 ms after the main motor started to rotate, the paper feed clutch and
the relay clutch turn on. The feed roller and relay rollers feed the top sheet of
the paper stack to the registration rollers. When the leading edge of the
paper passes through the upper relay sensor, the paper feed clutch is
de-energized.
[E]
[G]
[D]
[H]
[C]
[B]
[F]
[A]
[L]
[I]
[J]
[K]
A156/A160/A162 2-78 STM
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