Paper Feeding Mechanism - Epson Stylus Photo 1390 Service Manual

EPSON Stylus Photo 1390/1400/1410

2.2.4 Paper Feeding Mechanism

The Paper Feeding Mechanism is designed to transfer the paper fed from the ASF, or
the CD-R fed from the CD/DVD Tray according to the print data. (The Stylus Photo
1390 is not equipped with CD/DVD related units.)
2.2.4.1 Paper Feeding Mechanism
The following shows the specifications of the DC motor that drives the Paper Feeding
Mechanism.
Table 2-6. PF Motor Specifications
Item
Type
Drive voltage
Armature resistance
Inductance
Rotor Inertia
Drive method
Drive IC
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.
OPERATING PRINCIPLES
Specifications
DC motor with brushes
+42V ± 5% (voltage applied to driver)
21.2Ω ± 10%
17.2mH (1kHz)
18.8gcm2
PWM
A6628
PF Motor
PF Timing Belt
Combination Gear
36.294, 55
PF Roller
The following shows the part names and outline of the drive transmission path.
Combination Gear
36.294, 55
PF Timing Belt
PF Motor
Spur Gear 31.5
PF Roller
Printer Mechanism
Spur Gear 31.5
Spur Gear 68
Front Paper Eject Roller
Spur Gear 16; B (rear)
Spur Gear 68
Spur Gear 16;
B (front)
Spur Gear 15.5
Front Paper Guide
Front Paper Eject Roller
Rear Paper Eject Roller
Figure 2-8. Paper Feeding Mechanism
Revision B
Spur Gear 16; B (front)
Spur Gear 15.5
Spur Gear 16; B (rear)
Rear Paper Eject Roller
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