Canon 2/3 Hole Puncher Unit-A1, Service Manual

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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).
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
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.
2. Technical Explanation
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