2.3.3 Backup roller mechanism
Because this machine employs a photoconductor belt,
the gap between the OPC and development unit,
cleaning unit, or OPC cleaning brush changes due to the
flexibility of the OPC belt. To cope with this problem, the
OPC unit has back-up rollers at each affected position.
Cleaning back-up roller
The cleaning backup roller is positioned 9 mm from the
center of the cleaning roller. This widens the contact
area of the cleaning roller and improves cleaning
efficiency.
The lock pawl on the rear of the release shaft engages
the OPC unit with the main body rear frame. This
prevents the OPC unit from being pulled out while the
back-up roller is set.
When the lever is turned clockwise, the back-up roller
moves down. At the same time, the pin mounted on the
rear of the release shaft turns the stopper and lock pawl.
The stopper is in contact with the holder and unit side
plate to restrict the turning range of the lever. When the
lock pawl meets the cutout of the main body rear frame,
the OPC unit can be pulled out.
Release shaft
Cleaning roller
Stopper
Cutout
Set
Release
Pin
Side plate
Holder
Stopper
Release
lever
Release shaft
Lock pawl
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