Epson Stylus CX7300 Service Manual page 51

EPSON Stylus CX7300/CX7400/DX7400/NX200/TX200 series/SX200 series/Stylus CX8300/CX8400/DX8400/NX400/TX400 series/SX400 series Revision C
2.1.5.2 Paper Feed Mechanism
The major components of the paper feed mechanism are the PF motor, PF roller, EJ
(paper eject) roller, PE sensor, PF encoder sensor, and PF scale. The sheet of paper fed
from the ASF unit is nipped between two rollers to be transported during printing and
to be ejected.
1. The first two rollers used for feeding the paper are the PF roller and the paper
guide roller mounted on the upper paper guide unit. The PF motor drive force is
transmitted to the paper guide roller via the PF roller.
2. The next two rollers are the EJ roller and the star wheel roller mounted on the Star
Wheel Holder Assy. The PF motor drive force is transmitted to the star wheel
roller via the EJ roller.
Left side
PF Scale
Paper Guide Roller
PF Motor
Pinion Gear
Spur Gear A
(PF Roller)
PF Motor Drive Transmission Path (as seen from the left side of the printer)
• PF motor pinion gear (CCW) → Spur gear A (PF roller) (CW) → Transmission gear (CCW) → Spur gear B (EJ roller) (CW)
OPERATING PRINCIPLES
PF Encoder Sensor
Star Wheel Roller
Spur Gear B
(EJ Roller)
Transmission Gear
Figure 2-13. Paper Feed Mechanism
The figure below shows how the PF motor pinion gear drive force is transmitted to the
PF roller, EJ roller, paper guide roller and the star wheel roller.
When the PF motor pinion gear starts counterclockwise rotation (as seen from the left
side), the sheet of paper fed from the ASF unit to the PF roller is transported and
ejected from the printer by the PF roller/paper guide roller combination and the EJ
roller/star wheel roller combination.
PF Motor
PF Roller
EJ Roller
Overview 51
Confidential