Ricoh Di-C1.5a Manual page 339

Registration
Punch Unit - Registration
HP Sensor
Paper Size
Sensors
Paper Edge
Sensor
When the paper comes from the main machine, the paper edge
sensor detects the leading edge.
The registration motor moves the slide unit towards the front,
until the paper size sensor that corresponds to the paper size
detects the rear edge of the paper.
When the paper edge sensor detects the trailing edge of the
paper, the paper transport motor (of the finisher) stops, and the
punch holes are made (shown in blue in the diagram).
Slide 339
The registration home position sensor detects when the slide unit is at home
position (in other words, when the paper edge sensors are at home position).
339
Di-C1.5 Training
Registration
Motor