Drum Claw Control; Cooling Around The Drum - Konica Minolta BIZHUB 750 Service Manual

Theory of Operation Ver1.0 Aug.2005
8.3.2

Drum claw control

A. Purpose
To prevent the occurrence of a drum wrap jam, 3 drum claws are employed to prevent the drum from being
wrapped with the paper. The contact and the release of contact of the drum claws onto the drum is made by
turning on and off the drum claw solenoid (SD1).
B. Oscillating operation
To prevent the paper from getting soiled in certain areas and the drum from being damaged, the drum claw con-
ducts the oscillation of about 8 mm on the drum surface.
There is a projection on the rear side of the separation guide plate assembly to which the drum claw is installed.
A cam provided on the gear presses this projection to push the separation guide plate assembly to the front
side. When the cam is released by the rotation of the gear, the separation guide plate assembly is brought back
to its former position by the spring. Repeating this operation oscillates the drum claws.
8.3.3

Cooling around the drum

The duct [3] is provided in the main scan direction of the drum [4] to exhaust heat and ozone around the drum
by the developing suction fan (FM4) [1]. To prevent toner and dust contained in the exhaust from escaping into
the environment, the developing suction filter is provided between the developing suction fan [FM4] and the
duct. And also, the developing cooling fan (FM12) is employed to cool down the underside of the developing
unit to improve the performance of the developer.
[5]
[1] Developing suction fan (FM4)
[2] Developing suction filter
[3] Duct
[3]
[4]
[5]
8. PHOTO CONDUCTOR SECTION
[4]
[1]
[2]
Drum
Developing cooling fan (FM12)
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