Canon Finisher-Q1, Service Manual

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Chapter 2
2-3
at the bottom to detect the trailing edge of paper and determine the perforation position. The punch motor is driven
by the punch controller PCB in response to the control signals from the finisher controller PCB. Punch dust generated
during punching is collected in the punch dust container. A reflection-type sensor (installed on the punch dust full
sensor PCB) is used to detect that punch dust is full.
F-2-2
2.2.3 Punch Operation
0006-6517
The hole puncher is driven by the punch motor (M1), and its position is monitored by the punch home position sensor
(SR2).
The hole puncher makes a single round-trip movement (punching) as the punch shaft rotates 180 deg
from home
position.
In the case of a 2-or-3 hole type, the half sector of the punch shaft is used when punching 2 holes while the half sector
on the opposite side is used when punching 3 holes as instructed by the host machine.
<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 controller PCB
Punch motor (M1) dr
iv
e signal
Punch motor cloc
k (SR1) detection signal
Punch home position (SR2) detection signal
Punch dust full detection signal
Photosensor PCB (Q1)
LED PCB (LED1)