Paper Loading/Feeding Mechanism - Epson Stylus CX4900 Service Manual

EPSON Stylus CX4900/CX4905/CX5000/DX5000/DX5050/CX5900/CX6000/DX6000/DX6050

2.2.4 Paper Loading/Feeding Mechanism

The following DC motor controls the Paper loading/feeding mechanism on this printer.
Table 2-2. PF Motor specifications
Item
Motor type
Drive voltage 42V (DC) ± 5% (voltage applied to driver)
Armature resistance
Inductance
Driving method
Driver IC
Left side view
Spur Gear 30.8 PF Encoder Sensor
PF Scale Spur Gear 30.8
1
2
3
PF Motor Spur Gear 36
pinion gear (EJ Roller)
Spur Gear 32.4
(PF Roller)
Note : The Clutch gear is molded on the backside of the Spur Gear 36.8 such as Combination gear.
OPERATING PRINCIPLES
Description
DC motor with brushes
27.5Ω ± 10%
21.4mH ± 25%
PWM, constant-current chopping
A6627
PF Motor
4
EJ Roller PF Roller
Figure 2-6. 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
Directions *
Clockwise
Counterclockwise
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.)
PE Sensor
Spur Gear 13.5
(PF roller)
Combination
Gear 21.24
Printer Mechanism
Corresponding functions
• Pick up and feed a paper
• Set the Change Lever on the Clutch mechanism
• Release the Change Lever from the Clutch mechanism
Left side view
Paper
Combination
Absent
Gear 27.2, 19.2
Spur Gear 36.8
7
6
2
5
PE Sensor
Lever
4
3 Low signal
Spur Gear 16
(Change Lever)
Spur Gear 27.2
Revision A
Paper
Present
Paper
High signal
70