Paper Feeding Mechanism - Epson Stylus CX4900 Service Manual

EPSON Stylus CX4900/CX4905/CX5000/DX5000/DX5050/CX5900/CX6000/DX6000/DX6050

2.2.4.2 Paper Feeding Mechanism

The Paper feeding mechanism consists of PF Motor, PF Roller, EJ Roller, PE Sensor,
PF Encoder and PF Scale etc. The Paper feeding mechanism feeds a paper loaded from
ASF Unit by using pairs of rollers.
1. One pair is the PF Roller and the Paper Guide Roller which is assembled in the
Paper Guide Upper Unit. The drive of the PF Motor is transmitted to the Paper
Guide Roller through the PF Roller.
2. Another pair is the EJ Roller and the Star Wheel which is assembled on the EJ
Frame Unit. The drive of the PF Motor is transmitted to the Star Wheel through the
EJ Roller.
Transmission path (left side view)
• PF Motor pinion gear (CW) → Spur Gear 30.8 (CCW) → Spur gear 32.4 (PF Roller) (CW)
• PF Motor pinion gear (CW) → Spur Gear 30.8 (CCW) → Spur gear 32.4 (PF Roller) (CW) → Spur Gear 30.8 (CCW) → Spur Gear 36 (EJ Roller) (CW)
OPERATING PRINCIPLES
Left side view
Spur Gear 30.8 Paper guide roller
Spur Gear 30.8
PF Encoder Sensor
Star Wheel
PF Motor Spur Gear 36
pinion gear (EJ Roller)
PF Scale
Spur Gear 32.4
(PF Roller)
Figure 2-9. Paper feeding mechanism
Following figure shows you the transmission path for the PF Roller & the Paper Guide
Roller and the EJ Roller & the Star Wheel.
The top of a paper is loaded to the PF Roller from the ASF Unit in the paper loading
sequence. And then, when the PF Motor pinion gear rotates CW direction (left side
view), a paper is fed by the PF Roller & the Paper Guide Roller and the EJ Roller & the
Star Wheel in the printing operation & the paper feed sequence.
PF Motor
PF Roller EJ Roller
Printer Mechanism
Revision A
74