MX-FN30, MX-FN31. Service Manual (Revised February 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 100

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MX-FN30/FN31  Technical Explanation Punch unit  7 – 6
C. Horizontal Registration Control
The horizontal registration control during punching is performed by the movement of the punch slide unit in the front and rear directions according to
the paper size. The punch slide unit is driven by the punch shift motor (M302). The home position is detected by the punch slide HP sensor (PS302).
During the horizontal registration control, the punch slide unit detects the paper edges through the punch horizontal registration sensors (PBA301/
302) and moves to the appropriate position for the paper size.
How the punch slide unit is driven during the horizontal registration control is described below.
1) When the punch inlet sensor (PS301) detects paper fed from the upstream connection machine, the punch shift motor (M302) drives, and the
punch slide unit starts moving to the rear.
Name
Role
Punch Motor (M301)
Drives the punch operation via a belt.
Punch Motor Clock Sensor PS305)
Detects the rotation of the punch motor (M301) of the DC motor.
Punch
Punches holes in paper.
Cam
Moves the punch up and down
Paper Stopper Guide
Stops the trailing edge of the paper that has been switched back during the punch operation in precision priority 
mode in order to align the paper in the feed direction.
Punch Shift Motor (M302)
Drives the punch slide operation via rack gear.
Punch Horizontal Registration Sensor
(light-emitting)(PBA301)
Detects the paper edges using detection units at five locations according to the paper size.
Punch Horizontal Registration Sensor (light-
receiving)(PBA302)
Punch Inlet Sensor (PS301)
Detects paper fed from the upstream connection machine.
Punch Slide HP Sensor (PS302)
Detects the home position of the punch slide unit.
Punch HP Sensor 1 (PS303)
Detects the position of punch operation (cam operation) using the combination of the on/off states of two 
sensors.
Punch HP Sensor 2 (PS304)
Punch Shift Motor (M302)
Paper
Punch Inlet Sensor (PS301)
Punch Horizontal Registration
Sensor (light-emitting) (PBA301)
Punch Slide HP Sensor (PS302)
Punch Horizontal Registration
Sensor (light-receiving) (PBA302)
Rack Gear
Punch Slide Unit
Paper
Punch Shift Motor (M302)
Punch Inlet Sensor
(PS301)
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