Xerox ColorQube 9303 Series, Service Manual

Page: 1742 / 1812

February 2013
8-48 ColorQube® 9303 Family
Principles of Operation
The inner two fingers are approximately 56 mm apart for registering thinner media fed by the
bypass and the outer two fingers are approximately 250 mm apart for registering the wider
media fed by the bypass.
The registration gate is positioned such that when the stack is registered:
• the stacks lead edge will be at the base of the ramp between the nudger and the feed nip,
• the nudger will be above the stack ready to lower and feed, and
• the media present sensor flag will be resting on the top of the stack indicating that media
is present.
Media Size Detection
The media size detection in the bypass tray is achieved using the width of the stack indicated
by the position of the media guides.
The customer is required to set the media guides to the front and rear edges of the stack to
enable accurate media width sensing.The user must correctly adjust the guide position, as
there is no alternative mechanism for sensing the media width in the bypass tray.
The media guides move synchronously when the customer moves either guide due to a double
rack and pinion mechanism. This ensures that the rack connected to the rear guide is always in
the same place for any specific media width.
The bypass tray features a potentiometer that has its follower sprung loaded against a ramp
profile in the rear rack. As the guides are moved further apart the voltage output from the
potentiometer decreases and when the guides are moved closer together the voltage output
from the potentiometer increases.
Also housed in the bypass tray is an opto-interrupt sensor called the media width sensor. The
activation flag of this sensor is part of the rear rack. The flag in the rack has three sections to it
giving a total of 7 regions.
There are 3 regions with a voltage high response and 4 regions with a voltage low response.
The combination of the potentiometer output voltage and the state of the media width sensor
indicates to the bypass tray software which width region the rear guide is in.
Each region has a defined maximum and minimum stack width that could be in the tray. This
information is then passed onto the IME code where the user is required to confirm the media
size in the tray.
As the width sensing is market differentiated, the default media size that will be presented to
the user for any given width region will depend on the worldwide location of the machine.
Table 1 covers each region’s width boundaries, default media by market and other media.
The media size in the cross process direction is detected using the potentiometer and flag sen-
sor, attached to the paper width guides. The user is asked to confirm the detected width size
via the UI or to enter a custom size. The size in the process direction is measured when the
edge of the paper activates the paper path timing sensor #16.
Nudger and Registration gate Operation
The nudger is lifted and lowered via a cam mechanism that is driven when the stepper motor is
reversed. Rotating the motor in reverse does not drive either the feed or the nudger roll due to
the one-way clutches on the feed shaft. The cam can only be driven in one direction by virtue
of a one way bearing housed in one of the gears in the gear train driving the cam. There are 2
‘V’ profiles on the cam surface that interact with the nudger follower and an additional spring
loaded locking lever. These enable the following functionality;
1. When the nudger follower is in either ‘V’ it prevents the nudger from lowering onto the
stack
2. When the additional locking lever is in a ‘V’ it prevents the cam rotating and lifting the
nudger during feeding, or affecting the nudger load.
3. Enables a large stop position window for all functional positions as the ‘Vs’ enable the
mechanism to self centre when stopped (the self centring also provides positional robust-
ness to any system vibrations should they occur)
The registration gate in its media loading position has its’ four fingers vertical in the paper path
at the base of the ramp between the nudger and the separation nip. The reg gate hard stop is
provided by a sprung loaded locking lever that prevents the rotation of the reg gate at its cam
follower. As the cam is rotated it first lifts the locking lever, thus removing the reg gate hard
stop, and then rotates the reg gate so its’ fingers retreat out of the paper path. The cam is
designed so that the nudger is not lowered until the reg gate is completely out of the paper path
and the reg gate is not raised until the nudger has been lifted off the stack. The reg gate returns
to its hard stopped position using a return spring. The forces have been balanced to ensure
that the reg gate spring will always overcome the locking lever spring forces. This ensures that
when media is removed from the bypass tray the reg gate will always return to its media load
locked position.
Table 1 Region width boundaries
Width Region
Region width
(mm)
US default EU default
Other media sizes
in region
Min Max
Region 1 100 126 ENV US#10 SEF Env dl SEF -
Region 2 122 170 Statement SEF A5 SEF Env C5 SEF, Env 6
x 9 SEF
Region 3 166 206 Executive - -
Region 4 202 256 Letter SEF A4 SEF Env C4 SEF, Env 9
x 12 SEF
Region 5 252 290 Letter LEF - Tabloid SEF
Region 6 286 314 Tabloid extra SEF A4 LEF A3 SEF
Region 7 310 322 - SRA3 SEF -