Gestetner B147, Service Manual

Page: 544 / 1081

IMAGE TRANSFER AND PAPER SEPARATION
B147/B149/B190 6-86 SM
6.11.5 TRANSFER BELT CONTACT
Mechanism
The transfer belt contact and release mechanism improves the lifetime of the
transfer belt and drums.
The drum for black always contacts the belt, but the transfer belt moves away from
the other drums during monochrome printing.
In the standby mode, the transfer belt contacts only the black drum. The transfer
belt comes away from the black drum when you turn the release lever
counterclockwise.
When the machine prints a color page, the machine waits until the previous page
has gone through the transfer unit. Then the transfer belt contact motor [C] turns on
and a cam [D] moves the lower end [E] of the transfer belt upward, so that it
contacts the other three drums.
The machine does not release the transfer belt from the color drums during the job,
even if a monochrome page comes again. This is because the total printing speed
reduces if the transfer belt changes position often.
The belt comes away from the color drums if the job is interrupted by any error
except a power failure.
NOTE: If a power failure occurs when the transfer belt is in contact with the drum,
the belt stays in this position. To release the belt, swing out the controller
box, and turn the drive gear [B] manually.
B146D568.WMF
[A]
[B]
[C]
[D]
[E]