Epson R1800 - Stylus Photo Color Inkjet Printer, Service Manual

Page: 25 / 234

EPSON Stylus Photo R1800/R2400 Revision B
Operating Principles Printer Mechanism 25
2.2.4 Paper Feeding Mechanism
The Paper Feeding Mechanism is designed to transfer the paper fed from the
ASF, Roll Paper Guide or Board Paper Guide or the CD-R fed from the CD-R
Tray according to the print data.
2.2.4.1 Paper Feeding Mechanism
The following shows the specifications of the DC motor that drives the Paper
Feeding Mechanism.
Like the CR Motor, a DC motor is used as the PF Motor in this product.
Closed loop control based on the DC Motor and Rotary Encoder has the
following advantages.
†
Improved paper feed accuracy
†
Paper feed amount control
The PF Motor drive is transmitted to the PF Roller and the Paper EJ Roller
following the route shown below. The route is also followed by the paper.
The following shows the part names and outline of the drive transmission path.
Figure 2-8. Paper Feeding Mechanism
Table 2-6. PF Motor Specifications
Item Specifications
Type DC motor with brushes
Drive voltage +42V ± 5% (voltage applied to driver)
Armature resistance 21.2
Ω
± 10%
Inductance 17.2mH (1kHz)
Drive method PWM
Drive IC A6628
PF Motor
PF Timing Belt
PF Roller Spur Gear 31.5
Spur Gear 68
Front Paper Eject Roller Spur Gear 16; B (front)
Spur Gear 15.5
Rear Paper Eject Roller
Combination Gear
36.294, 45.5
Spur Gear 16; B (rear)
Front Paper Guide
PF Roller
PF Motor
Front Paper Eject Roller
Rear Paper Eject Roller
PF Timing Belt
Combination Gear
36.294, 45.5
Spur Gear 31.5
Front Paper
Eject Roller
Spur Gear 68
Spur Gear 15.5
Spur Gear 16; B (rear)