Xerox Paser 7400 Service Manual page 53

When the number of sheets stacked on the processing tray reaches a specified value,
the sheets are delivered in stack form. Even if the unit never reaches a specified value,
stacked sheets are temporarily delivered when 25 sheets of large-size paper (300 mm
or longer) or 50 sheets of small-size paper (299 mm or shorter) have been stacked.
The finisher also uses a Tray Paper Sensor to detect the presence or absence of paper
in the stack tray. It also includes a Full Stack Sensor to detect overstacking.
Shift Upper
Limit Sensor
Shift Lower
Limit Sensor
Shift Motor
Clock Sensor
Stacking in Booklet Mode
In the Booklet stitching format, the stack feed system feeds up to 50 sheets of stitched
paper stack to the folding position. When stitching is complete, the Feed Motor
rotates until the upper stack feed roller begins to descend. After the paper stack is
inserted between the stack feed rollers, the Bind Clutch activates and rotates the Feed
Motor in the forward direction, feeding the paper stack to the middle position for
folding. The feed amount is equivalent to the number of pulses necessary to drive the
Feed Motor until the paper stack is ready for folding.
Theory of Operation
Full Stack Sensor
Shift Motor
Tray Paper Sensor
Paper Surface Sensor
Edge
Delivery Tray
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