Document Pickup/Separation; Basic Pickup Operation - Canon DADF-AA1 Service Manual

3.4 Document Pickup/Separation

3.4.1 Basic Pickup Operation

With a document placed on the document tray, pressing the print start key will pick up the document in the following manner.
a. Pickup operation
When the pickup/feed motor (M1) turns in reverse direction, the pickup roller unit lowers to rotate the pickup rollers, thus feeding the document. The stopper rises
in conjunction with the pickup roller unit. The separation sheet and pad are used to prevent multiple sheets from being fed together.
b. Formation of loop
While the pickup/feed motor (M1) is turning in the reverse direction, the document is fed against the stationary registration roller to form a loop because the regis-
tration clutch is not driven, thus preventing the document from skewing.
c. Feed
The pickup/feed motor (M1) turns in the reverse direction to drive the registration clutch (CL2), thus allowing the registration roller to feed the document. The read
roller feeds the document to the read wait point. When the document reaches the read wait point, the pickup/feed motor (M1) stops.
M1
Pickup roller unit
CL1
Document
Stopper
Registration roller
Formation of loop
M1
CL2
Registration
roller
Read roller 1
Read wait point
M1
Pickup roller unit
CL1
Separation sheet
Separation pad
F-3-12
F-3-13
F-3-14
Chapter 3
0024-6992
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