Canon imageRUNNER iR2270 Service Manual page 159

Chapter 2
[punch shaft stopped/
home position]
<2-/3-hole Dual Use Type>
At the home position, the punch home position sensor is ON. To punch two holes, punching
of the first sheet ends when the punch shaft half peripheral area has rotated in the forward
direction 180 deg, and the state of the punch home position sensor has changed from OFF
to ON. At this time, the 3-hole puncher is moved reciprocally in the escape direction (hole
puncher rise direction) on the remaining half peripheral area on the punch shaft. Punching
of the second sheet ends when the punch shaft half peripheral area has rotated in the reverse
direction 180 deg, and the state of the punch home position sensor has changed from OFF
to ON. Also at this time, the 3-hole puncher is moved reciprocally in the escape direction
(hole puncher rise direction) on the remaining half peripheral area on the punch shaft. To
punch three holes, the 2-hole puncher is moved reciprocally in the escape direction (hole
puncher rise direction).
The following illustrates punching when two sheets are punched with two holes.
1) A hole is punched in the trailing edge of the first sheet.
2-6
[punch shaft rotated 90 deg
in the reverse direction/
hole punched]
F-2-4
[punch shaft rotated 180 deg
in the reverse direction/
punch operation completed]