Fig. 4-97 Paper Separating Subassembly Main Components - Canon NP-70 Service Manual

4-82
NP-70
Fig. 496 depicts the Paper Separating Subassembly in its normal operating position. As the
main drive motor (M1) turns the drum, the separation roller is also driven (see arrows). The
movements of these components drive the separation belt around its endless path at the same
rate of speed as the drum.
When a sheet of paper exits the paper feed guide plates (above the lower rollers of this unit),
it contacts the drum and overlaps the separation belt; in other words, the belt is between the
paper and the drum. Due to the wetness of the drum, the paper adheres and turns with the
drum. The movement carries the paper through the field of the transfer corona and the image
is "moved" to the paper.
When the paper reaches the separation roller, it is pinched between the roller and the sepaza-
tion belt. As the belt now moves over the sepazation roller (rather than the drum surface),
the machine-front end of the paper is drawn away from the drum. The remainder of the
paper is drawn away from the drum due to the airflow within the copier (see section 4.14 —
Blower &Fan Assemblies) resulting in a sepazation of the paper along its entire leading-edge.
This process will continue and carry the paper to the Heater Assembly and, finally, out of
the copier.
4.12-2
ASSEMBLY MAIN COMPONENTS
Release
Lever
Tension Aan
Spring
Installation
Stud
Separation
Belt
Fra
Pulley F
Pulley B
Pulley A
Belt Cleaner
Pulley C
Iley E
Pulley D
Fig. 4-97 Paper Separating Subassembly Main Components
1) SEPARATION BELT
An endless, flat polyester belt with a width of 2 mm and thickness of 0.15 mm having no ir-
regularities or deformities.
2) TENSION ARM AND SPRING
Maintain the separation belt at the proper constant tension.
Second Printing,lune, 1974 © CANON INC.