Epson Stylus DX4850 Service Manual

EPSON Stylus CX4100/CX4200/CX4700/CX4800/DX4200/DX4800/DX4850 Revision A
OPERATING PRINCIPLES Printer Mechanism 66
2.2.4 Paper Loading/Feeding Mechanism
The following DC 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.
Note "*": The PF Motor pinion gear 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 EJ Roller. (The numbers in the following figure show you the order
of transmission path.)
Figure 2-6. Paper loading/feeding mechanism
Table 2-2. PF Motor specifications
Item Description
Motor type DC motor with brushes
Drive voltage 42V (DC) ± 5% (voltage applied to driver)
Armature resistance 27.5Ω ± 10%
Inductance 21.4mH ± 25%
Driving method PWM, constant-current chopping
Driver IC A6627
Table 2-3. ASF unit function & PF Motor rotational direction
Directions * Corresponding functions
Clockwise
• Pick up and feed a paper
• Set the Change Lever on the Clutch mechanism
Counterclockwise • Release the Change Lever from the Clutch mechanism
Spur Gear 27.2
Spur Gear 36.8
Combination
Gear 27.2, 19.2
Spur Gear 16
(Change Lever)
Spur Gear 13.5
(PF roller)
PE Sensor
Lever
Paper
High signal
Paper
Absent
Paper
Present
Spur Gear 30.8
PF Motor
pinion gear
Combination
Gear 21.24
Left side view
EJ Roller
PE Sensor
PF Scale
Spur Gear 32.4
(PF Roller)
Spur Gear 30.8
Spur Gear 36
(EJ Roller)
PF Encoder Sensor
PF Roller
Left side view
Low signal
Note : The Clutch gear is molded on the backside of the Spur Gear 36.8 such as Combination gear.
1
2
3
4
2
3
4
5
6
7
PF Motor

Epson Stylus DX4850 Specifications

General

Brand	Epson
Model	Stylus DX4850
Category	Printer
Language	English