Mechanical Drives; Copy Size Sensing - Xerox DocuColor 12/DCCS50 Service Manual

As the paper advances through Tray 5 Take Away Rolls, the lead edge of the paper passes a
reflective sensor. The signal from this sensor is compared to the TR0 signal from the IBT by the
machine run control. The machine run control signals Tray 5 Motor to run the Take Away Rolls
faster or slower so that the paper will synchronize with the IBT for proper image transfer.
The same alignment procedure occurs when the paper comes from the Vertical Transport and
Paper Tray direction. In this case, a Preregistration Sensor signals the machine run control
which has the Tray 5 Motor vary the speed of the Preregistration Rolls. Refer to
Tray 5 Motor speed adjustments of these rollers. From either Tray 5 Take Away Rolls or the
Preregistration Rolls, the copy is advanced to the Registration Rolls for "deskewing". (See
Paper Registration and Paper Transport to the IBT
Figure 1 Motor Speed Adjustments for Paper and Image Alignment
Tray 5 Mechanical Drives
Tray 5 uses two motors:
• Tray 5 Motor drives Tray 5 Nudger roll, Tray 5 Feed Roll, Tray 5 Take Away Rolls, Pre-
Registration Rolls and Take Away Rolls #1.
• Tray 5 Lifter Motor raises or lowers the Paper Lifter to control the paper level for correct
feed height in Tray 5.
- Clockwise raises the Paper Lifter
- Counter clockwise lowers the Paper Lifter
Reissue
DocuColor 12/DCCS50
Figure 1
Belt.)
NUDGER ROLL
SOLENOID
for
SIZE
GUIDE
PAPER TRAY
LIFT
Tray 5 Copy Size Sensing
When paper is placed in Tray 5, a paper Size Guide is manually adjusted to accommodate the
lead edge dimension of the copy. The Size Guide uses a variable resistor sensor (0-5 VDC) for
providing the lead edge dimension to the machine run control. The length of the paper (run
dimension) is determined by the activation time of the Pre Fuser Sensor.
Tray 5 Motor
Paper Size Sensor
Figure 3 Tray 5 Drive and Size Sensor
1/05
10-105
PAPER LEVEL SENSOR
FEED ROLL
RETARD ROLL
Figure 2 Tray 5 components
Nudger Roll
Tray 5 Take Away Roll
Principles of Operation
PAPER OUT
SENSOR
FEED OUT
SENSOR
Tray 5