Canon imageRUNNER iR2270 Service Manual page 158

<2-/4-hole Type>
At the home position, the punch home position sensor is ON. Punching of the first sheet
ends when the punch shaft has rotated in the forward direction 180 deg, and the state of the
punch home position sensor has changed from OFF to ON. Punching of the second sheet
ends when the punch shaft has rotated in the reverse direction 180 deg , and the state of the
punch home position sensor has changed from OFF to ON.
The following illustrates punching when two sheets are punched.
1) A hole is punched in the trailing edge of the first sheet.
Punch home
position sensor
(SR2)
Eccentric
cam
Die
Die
[punch shaft stopped/
home position]
2) A hole is punched in the trailing edge of the second sheet.
Sensor flag
Punch shaft
Hole
puncher
Sheet
[punch shaft rotated 90 deg
in the forward direction /
hole punched]
Punched scrap
F-2-3
Chapter 2
[punch shaft rotated 180 deg
in the forward direction /
punch operation completed]
2-5