Xerox ColorQube 9303 Series Service Manual page 1804

After the stapling operation is complete, the backstop raises the stapled set to the fold position,
so that the centre line of the set is directly in line with the crease blade. At the same time, the
crease roll gate motor moves the crease roll gate up until it actuates the crease roll gate home
sensor.
The BM crease roll motor, MOT12-253 is energized when the backstop reaches the fold posi-
tion, and continues to run until 220 ms after the trail edge of the folded book is detected at the
BM exit sensor, Q12-213. An encoder wheel is mounted on the output shaft of the BM crease
roll motor. The encoder wheel is read by the BM crease roll motor encoder sensor, Q12-216 to
control the roll surface speed.
A stapled set is folded by the combined function of the crease rolls and the crease blade. The
crease blade pushes the centre of the set into the crease rolls nip. The crease blade is driven
by the BM crease blade motor, MOT12-252. The BM crease blade home sensor, Q12-214 and
the BM crease blade motor encoder sensor, Q12-215 are used to monitor the location of the
crease blade during the folding process.
During booklet folding, the crease blade moves from home position when the backstop
reaches the fold position. The blade stroke is 36 pulses of the crease blade motor encoder
sensor from the blade home position.
During banner sheet folding, a delay of 700 ms from the trail edge at the BM entry sensor is
used before the crease blade moves from the home position.
The crease blade is held at the fold position by a dynamic brake for 250 ms to allow the banner
sheet or stapled set to be drawn into the crease rolls. The BM crease blade motor is then
reversed to drive the crease blade back to its home position as the crease rolls crease and
feed the booklet. The BM exit sensor, Q12-213, located just after the crease rolls, detects jams.
When the BM eject sensor is clear, the crease roll gate motor moves the crease roll gate down
to cover the crease rolls.
For a booklet consisting of 10 or more sheets, or when handling 8.5 x 11 in paper, folding is
executed four times before ejecting to provide extra creasing.
Bin 2
After a booklet is folded, it is ejected onto the bin 2 by the crease roll nip.
The bin 2 is mounted at the lower right side of the booklet maker, below bin 1. Bin 2 has two
bail arms and two parallel conveyor belts over a flat surface. With the tray extension raised, bin
2 has a capacity of 10 booklets of 11-15 sheets, or 20 booklets of 6-10 sheets, or 30 booklets of
1-5 sheets. With the tray extension lowered, the booklets can be allowed to drop into a suitable
box on the floor.
The BM eject sensor, located at the exit, provides control logic signals and monitors the paper
path for jam detection and timing control for actuation of the BM conveyor belt drive motor.
When a booklet has been compiled, it passes under the BM eject sensor and pushes partially
through the bail arm rollers. 200 ms after the lead edge is detected at BM eject sensor, the BM
conveyor belt drive motor, MOT12-274, is turned on and drives the two conveyor belts for a
preset time dependent on the booklet size.
Principles of Operation
The BM bin 2 90% full sensor, Q12-206 is an optical sensor located at the right of bin 2
between the conveyor belts.
As the booklets travel along the conveyor belts, they will actuate the BM bin 2 90% full sensor.
After 2000 ms, the control logic will declare a 90% tray full condition. At this point a counter is
set and the total number of books allowed after that point is determined by the number of
books already on the tray. Any additional books allowed to be stacked is based on the number
of times the BM eject sensor is actuated and the sizes of the books.
BM Paper Path Transport Motor
The BM compiler motor, MOT12-251 is driven at host speed and provides mechanical drive to
the BM entry roll nip.
Component location Figure 25
Crease
rolls
Figure 25 Booklet maker module components (1)
February 2013
8-110
and Figure 26.
Crease roll gate
BM staple head assembly
ColorQube® 9303 Family
Crease roll
gate motor
BM staple
head carrier
closed sensor