Epson STYLUS Scan 2000 Service Manual page 38

EPSON Stylus Scan 2000
Table 2-7. Print Modes and Drive Methods
Drive Speed
Printing mode
[CPS]
High Speed Skip 340
Normal Printing 200
Capping 80
Wiping 40
Cap (Valve
20
Release)
Withdrawal of cap 5
Drive from the PF motor is sent to the PF rollers and paper eject rollers as
described below.
To the PF rollers:
PF motor pinion gear (CCW rotation)
To the eject rollers:
PF motor pinion gear (CCW rotation)
(13.5, 30.8) Spur gear (28)
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
4080
phase drive*
Double 1-2, 2-2 phase
2400
drive
2-Double 1-2, 2-2
960
phase drive
2-Double1-2, 2-2 phase
480
drive
4-Double1-2, 2-2 phase
240
drive
4-Double 1-2, 2-2
60
phase drive
Gear 73.6 PF rollers
Gear 73.6 Combination gear
Paper eject rollers
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.
38