Grip Roller Release Mechanism - Gestetner B147 Service Manual

6.9.9 GRIP ROLLER RELEASE MECHANISM

[B]
[A]
The grip roller release mechanism reduces the pressure of the grip roller [E].
The grip roller transports a sheet of paper to the transfer unit. When the transfer
unit starts to feed the leading edge of the paper [G], the trailing edge has still not
reached the grip roller. So the paper is handled by the transfer unit and the grip
roller at the same time. If the handling speeds are not the same, this may skew the
paper. Longer paper sizes are more affected by the speed difference than shorter
sizes. From the viewpoint of image crispness, multi-color images are more easily
affected than mono-color images.
To solve this possible problem, the grip roller release mechanism is activated
under the following conditions:
1) B4 paper or longer is being fed.
2) The machine is operating in the full-color mode.
3) The leading edge of the paper has been fed in the transfer unit.
The spring [A] is always pressing the grip roller against the transport roller [B].
When the above conditions are met, the solenoid [F] turns on, the lever [C] pushes
the grip roller shaft [D], and the grip roller moves away from the paper.
SM
[D]
[C]
6-73
PAPER FEED
[E]
[F]
[G]
B146D550.WMF
B147/B149/B190