Paper Feed Assembly - Epson Stylus PRO 7500 Service Manual

EPSON Stylus Pro 7500

2.2.2 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.
Grid Roller
Secondary Roller
Assembly
PF Motor
Figure 2-7. Paper Feed Mechanism Unit 1/2
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.
Operating Principles
A DC servomotor is used for the PF motor and feedback control is carried out based on
pulses output by a rotary encoder sensor built into the motor, thus maintaining high printing
precision.
Driving of the grid roller is accomplished by the PF motor via the PF timing belt which
attaches to a reduction pulley that is connected to the grid roller.
R = Paper width flag
Pressure and follower roller assembly
L = Paper Set Lever flag
Paper Set Lever
Two suction fans are mounted behind Paper Guide L2. The space in the column direction
behind Paper Guide L2 is divided into 2 compartments, and one fan is mounted in each
compartment. By drawing air through multiple holes punched in Paper Guide L2 in the
back surface of the paper path and blowing it out through the rear of the printer housing,
suction is applied to the surfaces of Paper Guides L1 and L2 and the paper is stabilized
Print Mechanism Components
Secondary Roller Assembly
Grid Roller
Center Frame
Figure 2-8. Paper Feed Mechanical Unit PF Rail Unit
Revision A
CR Guide Rail
Speed-Reduction Gear
Platen
Subplaten
Paper
Paper Guide L1, L2
PF Motor
65