CHAPTER 2 BASIC OPERATION
3. Detecting the Size of an Originalc. Detection in Horizontal Direction
a. OutlineDetection in horizontal direction is made
The machine detects the size of an originalby the original width detecting volume (VR)
in relation to the vertical (feeding) andon the original tray. The original width
horizontal directions of the original, ensuringdetecting volume operates in conjunction with
correct size detection and for use for thethe side guide. As its resistance varies, the
communication protocol of fax mode.changes are detected by the DADF controller
PCB, which converts them into a length in
b. Detecting in Vertical (feeding)horizontal direction.
Direction
Detection in vertical direction is made by
the registration paper sensor (S3) and the
registration roller clock sensor (S11).Side guides
The registration paper sensor detects the
leading and trailing edges of an original, and
the registration roller clock sensor detects the
rotation of the registration roller while the
original moves past the sensor. The rotation ofVR
the registration roller is converted to the length
of the original.
DADF controller PCB
DADF controller PCB
Figure 2-209
Registration
paper sensor
Pick-up detection signal
Registration roller clock signal
Registration roller clock sensor
Registration roller
Figure 2-208
COPYRIGHT ? 1998 CANON INC. CANON DADF-A1 REV.0 DEC. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)2-13 |
ACEC
CANON
