Paper Feeding Mechanism - Epson Stylus COLOR 670 Service Manual

EPSON Stylus COLOR 670

2.1.4 Paper Feeding Mechanism

The paper feeding mechanism consists of paper feed motor (PF motor), PF
roller, paper eject roller, paper guide, and so on.
The paper feeding mechanism feeds paper loaded from ASF using the PF
roller and paper eject roller.
Spur Gear 36
Spur Gear 67.2
Spur Gear26.4
Combination Gear
Pinion gear
Combination Gear
Combination Gear 3,30
Figure 2-5. Paper Feeding Mechanism (Top View)
The following stepping motors are used to drive the paper feeding
mechanism.
Table 2-4. Paper Feed Motors
Item
Motor type 4-Phase/ 48-Pole PM Stepping motor
Drive voltage +42 V +/ - 5% (DRV IC voltage)
Coil Resistance 7.8
Inductance 14 mH +/ - 20%
Driving method Bi-Polar drive
Driver IC LB11847
Operating Principles
Description
+/ - 10% (per phase)
When DE (disengage) lever is at normal position, torque from the PF motor is
sent to the PF roller and paper eject roller as described below.
o
To the PF roller:
PF motor pinion gear
PF roller
o
To the paper eject roller:
PF motor pinion gear
Paper eject roller
EPSON Stylus COLOR 670 allows printing up to the last 3mm like EPSON
Stylus Photo 720 / EPSON Stylus Photo EX3. The star-wheel roller assembly
has been shifted 5 degrees from directly on the top of the eject roller towards
the paper feed roller. This suppresses the tailing edge of the paper so that the
old minimum margin of 14mm has been reduced to only 3mm.
[ Stylus COLOR 600 ]
Star Wheel Assy.
Paper
Eject Roller
[EPSON Stylus COLOR 670]
Figure 2-6. Paper Transportation (Right side view)
Overview
Combination gear (3, 30) Spur gear (67.2)
Combination gear (6, 34.4)
Support Roller
Printhead
PF Roller
Bottom margin 3 mm touches
Platen
the printhead surface.
Five Degrees
Steady
Revision A
Spur gear (36)
37