Transfixing And Exiting - Xerox Phaser 8400 Service Manual

Transfixing and Exiting

Transfixing and exiting consists of four major functions:
1.
Staging the paper for rendezvous with the image on the drum and transfix roller
nip.
2.
Loading the transfix roller and engaging the drum stripper blade assembly.
3.
Stripping the paper from the drum.
4.
Exiting the paper from the printer, or exiting the paper for (2-sided) duplex
printing.
Tripping the preheat exit sensor (see previous illustration) sets up a series of events,
which take place on a predetermined schedule. Paper is transported through the
preheater to thermally prepare it for transfixing. The preheat sensor detects the
paper's presence, and accurately references the leading edge of the paper with the
image on the drum.
Based on the timing information from the paper preheater, the leading edge of the
media is advanced to the transfix nip.
Once the paper is stopped in the transfix nip, the process motor gears move to rotate
the transfix camshaft to bring the transfix roller into contact with the drum (see
illustrations on following pages). The transfix roller nip applies the load necessary to
transfer the image to the paper from the drum.
At the point where the transfix roller loads, but before the drum begins to rotate, the
paper stripper solenoid engages. The paper stripper solenoid energizes the paper
stripper. The solenoid mounts on the upper inner duplex guide and activates the strip
solenoid lever, which in turn rotates the stripper carriage until it hits the transfix
ground pins. This action causes the stripper blade to drop onto the deadband of the
drum.
After the transfix roller and the stripper engage, the drum rotates to advance the paper
and transfix the image. The stripper blade catches the leading edge of the sheet of
paper and separates it from the drum. After the leading edge of the paper is beyond
the stripper blade, the stripper solenoid de-energizes.
When the solenoid is de-energized, the solenoid return spring provides a force to
move the solenoid plunger out of the solenoid coil which rotates the stripper carriage
back to its ready position.
Once the entire image is transferred, the drum stops rotating and the process drive lifts
the transfix roller. The media path drive now rotates the exit rollers in the correct
direction to pull the paper out. However, the deskew clutch is de energized so the
deskew rollers are not driven during transfix. The exit rollers deposit the paper into
the output tray, ending the print cycle.
Theory of Operation 2-27