Xerox ColorQube 9303 Series Service Manual page 1803

The BM entry roll has smaller hard rollers and larger soft foam rollers. As the lead edge of each
sheet touches the backstop, the trail edge is released by the hard roller nip, but is still held by
the soft roller, which pushes the sheet under the roller and against the right side of the booklet
compiler tray. This ensures that the trail edge of every compiled sheet is always located on the
same side of the following sheet, thus eliminating both stubbing and sheet order errors.
Cross process registration is maintained by using two tampers, which move in opposite direc-
tions simultaneously, and are driven by the BM tamper 1 motor, MOT 12-256. Tamping aligns
the centre of the sheets with the centre of the booklet compiler tray.
The tamping position is a preset number of motor steps from the BM tamper 1 home sensor,
Q12-205 and is based on the paper size of the compiled sheet, provided by the media path
driver PWB.
The tampers are moved from the home position to a ready position stored in NVM, when the
lead edge of the first sheet in the set is detected at the BM entry sensor, Q12-089.
As each sheet enters the booklet compiler tray, the tampers are moved from the ready position
to the tamping position, then returned to the ready position. For the last sheet of the set, the
tamping stroke is repeated once more. After the last sheet in a set is compiled and tamped, the
tampers are moved to the home position.
The BM flapper is utilized when the tampers start their return stroke from the tamp position to
the ready position. The BM flapper motor, MOT12-271 provides mechanical drive to the BM
flapper and the position of the flapper is controlled by the flapper home sensor Q12-207. The
fingers on the flapper push the sheet into the booklet tray to aid the registration and de-skew-
ing process. The flapper rotates after each sheet is tamped. The flappers are then parked in
the home position, so that the fingers on the flapper do not impede the next sheet fed into the
booklet compiler tray.
The set is then ready to be moved into position for the next operation of stapling.
Backstop Movement
The BM backstop system consists of a backstop assembly, mounted on a near vertical slide
driven by BM backstop motor MOT12-255, via a toothed belt. A flag mounted on the backstop
assembly actuates the BM guide home sensor, Q12-204 to signal the home position of the
backstop.
After the last sheet of the set has been received and compiled, the BM stack hold solenoids,
SOL12-259 are energized to hold the set in place. The BM backstop motor then moves the
backstop to the stapling position. The BM motor now performs a short up and then down again
to jog the set into place. After stapling, the BM backstop motor moves the backstop to the
creasing position.
Booklet Stapling
Two BM staple head assemblies are mounted on a bracket, which can be pivoted open for sta-
ple jam clearance. The BM staple head carrier closed sensor, Q12-217 detects the closed
position of the stapler bracket assembly.
ColorQube® 9303 Family
When the staplers are actuated, two staples are placed in the centre of the compiled stack,
spaced 120 mm apart. The maximum capacity for the stapling and folding in the booklet maker
is given in Table 1.
Table 1 Booklet maker stapling and folding capacity
Media Paper weight
Plain paper 60 to 80gsm (16 to
21lb bond)
Heavyweight 90gsm (24lb bond) 13
Heavyweight 120gsm (32lb
bond)
Heavyweight 160gsm (43lb
bond)
Heavyweight 216gsm (58lb
bond)
Plain paper with 60 to 80gsm (16 to
heavyweight cover 21lb bond) with
160gsm (43lb
bond) cover
Each stapler is cam driven by a DC motor and contains a home position switch. Each of the
staplers also contain a low staples switch to inform the control logic of a low staples condition.
The BM paper present sensor, Q12-170 is mounted on the stapler bracket assembly between
the two staplers. This sensor is used to prevent the staplers being energized if there is no
paper present in the booklet compiler tray, thereby preventing staple jams.
The stapling sequence operates as follows:
1. The tampers are energized to engage the stack and keep both edges in place.
2. After 50 ms, the front stapler is energized.
3. After a further 80 ms the rear stapler is energized.
This sequence prevents wrinkling of the paper and limits the load imposed on the power sup-
ply.
Once the staplers reach the home position, a dynamic brake is applied to prevent overrun. The
stapler motor will be reversed if the home switch is not made, after the stapling operation, in an
attempt to bring the stapler home and avoid a fault.
Folding and Creasing
The booklet creasing system consists of a crease blade, two pairs of crease rolls, a crease roll
gate and the backstop assembly.
The crease roll gate is used to cover the entry nip into the crease rolls. This prevents sheets
from coming into contact with the crease rolls during compiling.The crease roll gate is raised to
expose the crease rolls, or lowered to cover the opening to the crease rolls, by the crease roll
gate motor, MOT12-273. The home position (fully raised) is sensed by the BM crease roll gate
home sensor, Q12-222.
February 2013
8-109
Maximum No. of Maximum No. of
sheets booklet pages
15 60
52
10 40
7 28
5 20
14 including 1 56
cover
Principles of Operation