Document Detection; Outline; Initial Document Size Detection - Canon DADF-AV1 Service Manual

Document Detection

Outline

This machine detects a document using either of the two methods depending on the print mode.
• Normal print mode (other than mixed size print mode and banner paper mode)
• Mixed size print mode and banner paper mode
Normal print mode
Function
Document presence/absence detection
Initial document size absence
detection
Mixed size print mode and banner paper mode
Function
Document presence/absence detection
Mixed width document size de-
tection

Initial Document Size Detection

Initial document size is detected when a document is placed on the Document supply tray. The Document length sensor 1/2 (SR7/
SR8) and the Document width sensor 1/2/3 (SR13/SR14/SR15) are used for the detection.
The light shading detects document length whose sensor is the Document length sensor 1/2 (SR7/SR8).
Document width is detected by the Document width sensor 1/2/3 (SR13/SR14/SR15) which performs by light prevention plate
connected with the Slide guide adjustment.
Document sizes are determined by combination of ON/OFF states of these sensors.
The Document length sensor 1 (SR7) is a Reflection Sensor which is available to detect the length of a document in case that
the curled paper is placed on the document pickup tray.
Detects document existence on the Document sup-
ply tray.
Length Detects document length on the Document supply
tray.
Width Detects the document width on the Document sup-
ply tray.
Detects document existence on the Document sup-
ply tray.
Length Document length is detected while feeding.
Width Detects the maximum document width on the
Document supply tray.
Document width is detected while feeding.
Description
Description
23
2. Technical Explanation
Symbol
Document set sensor(SR5)
Document length sensor 1/2
(SR7/SR8)
Document width sensor1/2/3
(SR13/SR14/SR15)
Symbol
Document set sensor (SR5)
Registration sensor (SR1)
Read sensor (SR2)
Document width sensor1/2/3
(SR13/SR14/SR15)
Different width sensor 1/2/3/4
(SR9/SR10/SR11/SR12)