Epson Stylus Photo785EPX, Service Manual

Page: 37 / 192

EPSON Stylus PHOTO 895/785EPX/915/825 Revision B
Operating Principles Overview 37
2.1.4 Paper Feeding Mechanism
The paper feeding mechanism consists of Paper feed motor (PF motor), PF roller,
Paper eject roller, Star wheel roller, and so on. The paper feeding mechanism feeds
paper loaded from ASF using the PF roller and Paper Eject Roller & Star wheel roller.
For this mechanism, the PF motor mentioned in the right Table 2-3."PF Motor
Specifications" is used on this product.
The drive of the PF motor is transfer to the PF roller and the Paper Eject Roller as
following Figure 2-8. "Paper Feeding Mechanism". Following shows you how to
transfer the PF motor drive to the PF roller and the Paper Eject Roller.
†
PF motor drive transmission path
•PF roller path
PF Motor Pinion Gear (CW)
→
Combination Gear 16, 21.6 (CCW)
→
Spur
Gear 73.6 (CW)
•Paper eject roller path
PF Motor Pinion Gear (CW)
→
Combination Gear 11.6, 36.8 (CCW)
→
Spur
Gear 25.6 (CW)
Figure 2-8. Paper Feeding Mechanism
Table 2-3.
PF Motor Specifications
Item Description
Motor type 4-Phase/ 200-Pole HB Stepping motor
Drive voltage +42 V +/ - 5% (DRV IC voltage)
Coil Resistance 7.8
Ω
+/ - 10% (25°C, per phase)
Inductance 13.5 mH +/ - 20%(1kH 1Vrms)
Driving method Bi-Polar drive
Driver IC LB11847
Spur Gear 73.6
(PF Roller)
Spur Gear 25.6
(Paper Eject Roller)
Combination
Gear 11.6, 36.8
Combination Gear 16, 21.6
PF Motor