Canon Puncher Unit-L1, Service Manual

Page: 27 / 92

Chapter 2
2-5
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°, 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° , 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.
F-2-3
2) A hole is punched in the trailing edge of the second sheet.
F-2-4
<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°, 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°, 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
[punch shaft stopped/
home position] [punch shaft rotated 90˚
in the forward direction /
hole punched] [punch shaft rotated 180˚
in the forward direction /
punch operation completed]
Sensor flag
Punch home
position sensor
(PI63)
Punch shaft
Eccentric
cam
Hole
puncher
Die
Die
Sheet
Punched scrap
[punch shaft stopped/
home position] [punch shaft rotated 90˚
in the reverse direction/
hole punched] [punch shaft rotated 180˚
in the reverse direction/
punch operation completed]