Staple Detection - Canon imageFORMULA DR-X10C Service Manual

CHAPTER 2 FUNCTION & OPERATION

4. Staple Detection

The staple detection of this machine de-
tects jumping of stapled documents. Like the
conventional machine, DR-7580/9080C, this
machine does not detect presence of staples.
Therefore, the documents must be jumping.
An example of a specific condition is shown
below.
The stapled position must be only one of 4
corners.
The document size must be A5 or larger.
Set the document based on the center.
An oblique perspective figure of the sta-
ple detection section is shown below. The
staple PCB is mounted on the right and
1
left sides of the pickup inlet and a rectangular
light guide is assembled on the pickup
2
roller cover at the center.
Staple PCB
Figure 2-306
Four LEDs and 1 light-receiving element
are mounted on the staple PCB. An illustration
of light emission and reception is shown be-
low.
Light guide
Figure 2-307
2-18
Light guide
Light-receiving
element
LED4
LED3
LED2
LED1
COPYRIGHT © CANON ELECTRONICS INC. 2008
The LEDs light one by one from the bot-
tom. If documents do not jump, light enters the
opposite light-receiving element through the
central light guide. Then, the opposite LED
lights in the same way. This process is re-
peated. If the documents jump, the light path
is blocked, so the light cannot be detected.
This condition is judged as staple detection,
the feeding of documents stops and the
pickup tray is lowered to the standby position.
An error message is displayed on the opera-
tion panel of this machine and the screen of
the computer.
An actual figure during staple detection is
shown below.
Documents
Figure 2-308
CANON DR-X10C FIRST EDITION