Sharp Z-87 Service Manual page 19

2 At the moment the PRINT key is pressed, the main motor starts to
turn the drive gears. The paper feed gear also starts to be driven,
but the rotation of the gear is not conveyed to the paper feed roller
shaft and the paper feed roller does not rotate because the paper
feed latch is holding the clutch sleeve protrusion.
Paper feed frame
Paper feed roller A
3 0.9 seconds after the start of the main motor, the paper feed
solenoid (PFS) actuates momentarily so that the paper feed latch
disengages from the clutch sleeve protrusion. Now, the rotation of
the paper feed gear is conveyed to the paper feed roller shaft so
that paper feed roller A starts rotating to feed the paper.
Paper feed latch
Paper
Paper feed frame
Clutch sleeve protrusion
Paper feed roller A
4 After paper feed roller A makes one full turn, the clutch sleeve
protrusion is again caught by the paper feed latch so that paper
feed roller A stops rotating.
Rotating section
Paper feed gear
Clutch spring
Paper feed
roller shaft
Clutch sleeve protrusion
Spring clutch
Paper feed roller A
Rotating section
Paper feed gear
Clutch spring
Paper feed
roller shaft
Spring clutch
5 Meanwhile, the paper fed into the machine is transported to paper
feed roller B and the paper entry sensor (PPD). There, the paper
is held temporarily by means of the PS plate, in order to
synchronize with the lead edge of the image on the drum. Since
paper feed roller B is continues to rotate, the paper will be evenly
pressed against the PS plate to correct for any paper feed skew.
Tension roller
Paper feed roller C
Paper feed roller A
6 The PS plate is mechanically released by the PS sensing block.
7 After the PS plate has been released, the paper is transferred to
the transfer unit via paper feed roller C. The paper is separated
from the drum by the remover tape and the separation roller.
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Paper
Tension roller
PS plate
PPD
Paper feed roller B
Paper
PS plate