Inverting; Punching - Xerox Paser 7400 Service Manual

The finishing processes include six major functions:
1.

Inverting

2. Folding
3.

Punching

4.
Stacking
5.
Stapling
6. Delivery
Inverting
The sole purpose of the inverter function is to position the paper for stacking or
folding. On command from the printer, The Inverter receives paper from a printer or a
Duplex Unit for inversion, if needed, and sent on to the Finisher.
The Inverter receives commands from the printer to receive and position entering
media. A Paper-in sensor detects the presence of paper. If the paper is not to be
inverted, it merely transfers to the Finisher. If the paper is to be inverted or prepared
for stacking or folding, a solenoid is energized to divert the paper into the inversion
path. Sensors in the upper and lower paper paths detect the leading and trailing edges
of the selected media. At the end of the paper path, the paper is then sent on to the
Finisher.
Punching
The Punch Unit is located in the pickup assembly of the Finisher. It is designed to
punch 2-holes, 3-holes, or 4-holes in sheets sent from the printer. When the trailing
edge of a sheet reaches the Punch Unit, the inlet roller of the Finisher assembly stops
the sheet long enough to punch a hole along the trailing edge of the sheet. The Punch
Unit is available in two unit types to accommodate the country of installation: 2- and
3-hole (punch Unit-K1), or 4-hole (Unit-G1 or H1).
The Punch Motor stops in relation to the count of the clock pulses from the Punch
Motor Clock Sensor. When the punch shaft rotates 180 degrees from its home
position, it initiates a single punching operation.
The 2-hole and 4-hole types punch a hole when the punch shaft rotates 180 degrees
from the home position, causing the punch to make a single rotation. The 2 and 3-hole
type punches a hole, but the circumference of the punch shaft is divided into two
(one-half for the 2-hole punch and one-half for the 3-hole punch).
The Punch Motor, Punch Unit, and sensors comprise the Punch Slide Unit, which
moves to the front/rear to accommodate the selected paper size.The Finisher Punch
Transfer Motor is a stepping motor that drives the movement to the front or rear.
2-14 Phaser 7400 Color Printer Options Service Manual