Epson Stylus Photo 1390 - 2.2.4 Paper Feeding Mechanism

EPSON Stylus Photo 1390/1400/1410 Revision B
OPERATING PRINCIPLES Printer Mechanism 30
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.
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 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 21.2Ω ± 10%
Inductance 17.2mH (1kHz)
Rotor Inertia 18.8gcm2
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, 55
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, 55
Spur Gear 31.5
Spur Gear 16;
B (front)
Spur Gear 68
Spur Gear 15.5
Spur Gear 16; B (rear)