Ricoh Di-C1.5a Manual page 342

Two-hole and Four-hole Punch Units
Punch
Guides
Slider
Plate
Hole
Punch
The punch motor turns a cam. A pin moves along a helical groove
in this cam, and this pin moves the slider plates to the front and
to the rear (only one slider plate is visible in this drawing).
The hole punches are attached to the slider plates. Pins attached
to the hole punches are linked to punch guides that are carved
into the slider plates.
When the slider plate moves side to side, the hole punches move
down and up to make holes in the paper. All punches move at the
same time.
Slide 342
The two-hole punch unit and the four-hole punch unit have the same
mechanism.
The two-hole punch unit is described here.
342
Di-C1.5 Training
Cam
Pin
Punch
Motor