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EPSON Stylus PHOTO 810/820/830 Revision B
Operating Principles Overview 32
2.1.4 Paper Loading/Feeding Mechanism
The following stepping motor controls the Paper loading/feeding mechanism on this
printer.
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.
*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.)
Note: The Clutch gear is molded on the backside of the Spur gear 35.2 such as Combination gear.
Figure 2-7. Paper loading/feeding mechanism
Table 2-2. PF motor specifications
Item Description
Motor type 4-Phase/ 96-Poles PM Stepping motor
Drive voltage +42 V +/ - 5% (DRV IC voltage)
Coil Resistance
6
Ω
+/ - 10% (per phase at 25 degrees)
(Stylus Photo 810/820)
5.4
Ω
+/ - 10% (per phase at 25 degrees)
(Stylus Photo 820/830)
Inductance
9.5 mH +/ - 20% (1kH 1Vrms)
(Stylus Photo 810/820)
8.2 mH +/ - 20% (1kH 1Vrms)
(Stylus Photo 820/830)
Driving method Bi-Polar drive
Driver IC LB1946
(Stylus Photo 810/820) /
A6615
(Stylus Photo 820/830)
Table 2-3. ASF unit function & PF motor rotational direction
Directions
*2
Corresponding functions
Clockwise
• Release the Change lever from the Clutch mechanism
Counterclockwise
• Pick up and feed a paper
• Set the Change lever on the Clutch mechanism
Spur gear 27.2
Spur gear
35.2
Combination
gear 16.32
Spur gear 25.6
Spur gear 10,8
(PF roller)
PE detection
lever
Paper
Low signal
High signal
No paper
Detect a
paper
Spur gear 60
(PF roller)
Spur gear 60
(Paper eject roller)
PF motor pinion gear
Combination
gear 18.28
1
2
3
1
1
4
5
6
Left side view
Right side view
PF motor
Paper eject roller
PF roller
HP/PE sensor