Controlling The Phase Of The Crescent Roller - Sharp AR-FN8 Service Manual

CHAPTER 3 SADDLE STITCHER UNIT BASIC OPERATION
E.

Controlling the Phase of the Crescent Roller

1. Outline
If alignment was executed with the crescent roller in contact with the stack of sheets, the
resulting friction against the roller causes the stack to move inappropriately (Figure 3-317). To
prevent this problem, the phase of the roller is identified and used to determine the timing of align-
ment.
The phase of the crescent roller is identified by the crescent roller phase sensor (PI12S). The
flag for the crescent roller phase sensor is mounted to the crescent roller shaft. The flag will leave
the sensor while the roller shaft rotates, turning the sensor ON or OFF, enabling the assumption that
the crescent roller is positioned at the opposite side of the stack (Figure 3-319). The alignment
plates are operated to correspond with this change in the state of the sensor.
M1S
Feed motor
3-26
Crescent roller
phase sensor (PI12S)
Flag
Stack
Figure 3-317
Alignment plates
Crescent roller