1.
Outline
a.
Function
The drum unit serves to transfer the toner image developed on the
photosensitive drum onto print paper and also to clean the surface of the
photosensitive drum to prepare for the formation of the next
image.
b.
Construction
The drum unit consists of the photosensitive drum [1], primary
charging roller [2], and cleaning blade [3].
The photosensitive drum receives drive from the main
motor by way of the developing clutch, and the primary charging roller operates
in keeping with the movement of the photosensitive drum. The cleaning blade remains in contact with the
photosensitive drum at all times, and the toner scraped off by the blade is sent
to the waste toner bottle by the work of the waste toner
feedscrew. The machine is equipped with a brush [4] used to
clean the primary charging roller.
See the following diagram to find out how the components of the drum
unit are arranged:
○Drum Unit
[1] Photosensitive drum
[2] Cleaning blade
[3] Primary charging roller
[4] Primary charging roller cleaning brush
[5] Waste toner outlet
Next, we are going to study the functions of the drum
unit.
a.
Outline
As more and more prints are made, there will be a
growing buildup of toner and paper lint on the primary charging roller, causing
image faults if left unattended. The machine is designed to execute cleaning of the primary charging
roller as follows:
b.
Timing of Execution
The machine executes a cleaning run while the photosensitive drum is
rotating.
c.
Particulars of Operation
The cleaning brush [3] remains in contact with the primary charging
roller [2] at all times. It slides to the right and left (reciprocating
movement) because of the force of the cam gear [4] that rotates with the
photosensitive drum [1], thereby cleaning the primary charging roller as long as
the photosensitive drum rotates.
[1] Photosensitive drum
[2] Primary charging roller
[3] Primary charging roller cleaning brush
[4] Brush drive cam gear
No comments:
Post a Comment