Epson Stylus SCAN 2000 Service Manual page 37

EPSON Stylus Scan 2000
Table 2-7. Motor Control at Each Mode
Drive Speed
Printing mode
[CPS]
High Speed Skip 340
Normal Printing 200
Capping 80
Wiping 40
Cap (Valve Release) 20
Withdrawal of cap 5
Drive from the PF motor is sent to the PF rollers and paper eject rollers as described
below.
o
To the PF rollers:
PF motor pinion gear (CCW rotation)
o
To the eject rollers:
PF motor pinion gear (CCW rotation)
→ →
308) Spur gear (28) Paper eject rollers
NOTE: Above CCW rotation is mentioned viewing from the PF motor pinion gear side.
Figure 2-8 shows a paper feeding mechanism block diagram, which includes the parts
along the PF motor drive-transmission paths.
Operating Principles
Drive frequency
Drive method
[PPS]
Double 1-2, 2-2,1-2 phase
4080
drive*
2400 Double 1-2, 2-2 phase drive
2-Double 1-2, 2-2 phase
960
drive
2-Double1-2, 2-2 phase
480
drive
4-Double1-2, 2-2 phase
240
drive
4-Double 1-2, 2-2 phase
60
drive
→ →
Gear 73.6 PF rollers
→ →
Gear 73.6 Combination gear (13.5,
Printer Mechanism Operation
Gear
73.6
Paper Eject Roller
PF motor
Combination
Gear 28
Gear13.5,30.8
Figure 2-8. Paper Feeding Mechanism (Top View)
The printer feeds paper from the ASF (when the PE sensor located near the carriage
motor detects paper is loaded) through the paper path and stops feeding when the
paper's leading edge reaches the halfway point of the front paper guide. To correct for
any misfeeding, the paper is fed back toward the ASF a predetermined number of steps
and then it is fed forward again until it reaches the top-of-form position.
Once the printer starts printing, it advances paper using the PF rollers and subrollers
until it reaches the last 14mm of the paper, when it advances the paper using the star
wheel gear and paper eject rollers.
Torque sent from the ASF/Pump motor to the ASF unit via the disengage mechanism is
used for the following operation.
Revision A
PF Roller
Star Wheel Assy.
36