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EPSON Stylus Scan 2500 Revision A
Operating Principles Printer Mechanism Operation 40
2.2.4 Paper Feeding Mechanism
The paper feeding process begins at the ASF, continues through the PF
roller, and ends at the paper eject roller (and star-wheel gear).
The ASF unit, which is common with the Stylus COLOR 740 printers, is
driven by the PF motor (stepping motor). Torque sent from this motor
switches between the ASF unit and pump/PF roller depending on the
position of the disengage lever (described later).
In the EPSON Stylus Scan 2500, a four-phase hybrid type pulse motor is
used in the PF motor as a motive power of the paper mechanism. The
torque is sent at 2-Double 1-2, Double 1-2, 1-2, and 2-2 phase drives. This
motor drives the paper-feeding mechanism as well as the pump
mechanism which is necessary for printhead cleaning. By using this pulse
motor, it becomes possible to use variable drive levels for many
purposes, such as paper feed, slight paper feed, and high or low speed
absorption of pump operations. The following table shows PF motor
specifications.
Figure 2-7. PF Motor Internal Circuit Diagram
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)
→ Gear 73.6 → PF rollers
PF Motor Specifications
Item Description
Motor type 4-phase/200-pole Stepping motor
Drive voltage 42VDC
±
5%
Coil Resistance
7.8 Ohms
±
10%(per 1 phase under 25
°
C
environment)
Control method Bi-Polar Drive
Phase drive 1-2, 2-2, Double 1-2, 2-Double 1-2
Phase drive
Phase Drive Inch/pulse mm/pulse
2-2 1/720 0.035
1-2 1/1440 0.018
Double 1-2 1/2880 0.0088
2-Double 1-2 1/5760 0.0044
Motor Control for Each Mode
Printing mode
Drive Speed
[CPS]
Drive frequency
[PPS]
Drive method
High Speed Skip 340 4080
Double 1-2, 2-2,1-2
phase drive*
Normal Printing 200 2400
Double 1-2, 2-2 phase
drive
Capping 80 960
2-Double 1-2, 2-2 phase
drive
Wiping 40 480
2-Double1-2, 2-2 phase
drive
Cap (Valve
Release)
20 240
4-Double1-2, 2-2 phase
drive
Withdrawal of cap 5 60
4-Double 1-2, 2-2 phase
drive
Rotor
1
2
3
4
A
/A
B
/B