Epson STYLUS PRO 9400 - Paper Feed Assembly

EPSON Stylus Pro 7400/7800/9400/9800 Revision B
Operating Principles Print Mechanism Components 160
2.2.3 Paper Feed Assembly
This printer uses friction feed to carry out highly precise feeding of roll paper and cut
sheets, and comprises a unique paper feed mechanism.
The paper feed mechanism unit is configured from a grid roller (one piece
construction), and pressurizing and follower roller assemblies mounted on the back of
the CR guide rail opposite the front surface.
Figure 2-10. Paper Feed Assembly
 PF motor
The PF motor is a DC motor. The slit of the loop scale mounted on the Grid Roller
is read by the PF_ENC sensor and the output pulse is fed back to control the
motor. This feedback control ensures high printing accuracy.
The PF motor drive is transmitted to the grid roller via the PF timing belt and the
reduction pulley.
Figure 2-11. Paper Feed Mechanical Unit PF Rail Unit
Secondary Roller Assembly Grid Roller
PF Motor
R = P THICK1 Sensor
L = P THICK2 Sensor
Paper Set Lever
Secondary Roller Assembly
CR Guide Rail
Reduction
Pulley
PF Motor
Center Frame
Grid Roller
Platen
Sub Platen
Paper
Paper Guide L1, L2