Lifting Mechanism - Ricoh FT4430 Service Manual

16 April '88

LIFTING MECHANISM

The torsion spring [A] is installed inside the torsion spring collars. A screw
fixes the center of the torsion spring, and both sides of the spring are twisted
when the belt unit is lowered. The spring tension makes it easier to lift up the
belt unit.
The cam plates [B] are sandwiched between the brake shoes [C], which are
under pressure from the brake shoe springs [D]. This causes friction between
the cam plate and the brake shoes.
When the belt unit is lifted up, the lift switch [SW-IO] is turned on by the
detent arm as it moves along the cam plate. When the lift switch is turned on,
DF modes are prohibited. At the same time, the DF CPU sends a signal to the
copier CPU. This signal enables the copier to operate without the document
feeder.
7-12