Canon External 2/3 Hole Puncher-B1, Service Manual

Page: 23 / 72

Chapter 2
2-3
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 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.
F-2-5
When two holes are punched, the 3-hole puncher is fed reciprocally in the escape direction (hole puncher rise direction) as shown below.
[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]
[punch shaft stopped/
home position] [punch shaft is rotated 90˚
in the forward direction/
hole punched] [punch shaft is 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