OKIDATA OL1200ex, Service Manual

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(b) Hopping (front feeder)
1 Rotating the pulse motor in the direction b (Counter Clock-wise direction) drives the hopping roller
of the front feeder to advance the paper until the inlet sensor turns on. At the same time, the
one-way clutch gear A also rotates. However, the hopping roller of the 1st tray will not rotate due
to the one-way bearing.
A cam to push down the front feeder plate is attached on each of the ends of the hopping roller
shaft. These cams push down the front feeder plate when the hopping operation is not performed
so as to facilitate the setting of paper into the tray. A microswitch is provided under the front
feeder plate to detect that the front feeder plate is at the lower position. When the front feeder
plate is at the lower position, this microswitch causes the motor to stop.