Ricoh Di-C1 Manual page 338

Three-hole Punching
Punch
Guide
Hole
Punch
For the first sheet of paper, the punch motor moves the slider
plate to the rear.
The punch guide forces the hole punch to move down, to punch a
hole in the paper.
The punch motor then changes direction until home position is
detected again.
For the next sheet, the punch motor moves the slider plate to the
rear again. It does not turn in the opposite direction.
Slide 338
If the slider plate is moved to the front from home position, the three-hole
punches do not move down to the paper. However, the two-hole punches do
move down, as we shall see on the next slide.
338
Di-C1 Training