Paper Loading/Feeding Mechanism - Epson Stylus PHOTO 820 Service Manual

EPSON Stylus PHOTO 810/820

2.1.4 Paper Loading/Feeding Mechanism

The following stepping motor controls the Paper loading/feeding mechanism on this
printer.
Table 2-2. PF motor specifications
Item
Motor type
Drive voltage
Coil Resistance
Inductance
Driving method
Driver IC
Left side view
Spur gear 60
Spur gear 60
(Paper eject roller)
(PF roller)
1
PF motor pinion gear
Note: The Clutch gear is molded on the backside of the Spur gear 35.2 such as Combination gear.
Operating Principles
Description
4-Phase/ 96-Poles PM Stepping motor
+42 V +/ - 5% (DRV IC voltage)
6 +/ - 10% (per phase at 25 degrees)
9.5 mH +/ - 20% (1kH 1Vrms)
Bi-Polar drive
LB1946
PF roller
1
Paper eject roller
PF motor
Figure 2-7. Paper loading/feeding mechanism
The drive of the PF motor is transmitted to the LD roller shaft and the PF roller through
gears for the Paper loading/feeding mechanism. The Paper loading mechanism plays a
role in loading a paper from the ASF unit to the PF roller. And also, the Paper feeding
mechanism plays a role in feeding a paper loaded from the ASF unit. The functions of
the Paper loading/feeding mechanism varies depending on the rotational direction of
the PF motor as the table below.
Table 2-3. ASF unit function & PF motor rotational direction
*2
Directions
Clockwise
Counterclockwise
*2
: The PF motor rotation direction = seen from the left side of the printer.
Following shows you the transmission path of the PF motor drive to the LD roller, the
PF roller and the Paper eject roller. (The numbers in the following figure show you the
order of transmission path.)
HP/PE sensor
Spur gear 10,8
(PF roller)
1
Combination
gear 18.28
Spur gear 27.2
Overview
Corresponding functions
• Release the Change lever from the Clutch mechanism
• Pick up and feed a paper
• Set the Change lever on the Clutch mechanism
Right side view
Spur gear
35.2
No paper
6
5
4
2
Combination
3
gear 16.32
Spur gear 25.6
Low signal
Revision A
Detect a
paper
Paper
PE detection
lever
High signal
32