Paper Feed Mechanism And Pump Mechanism - Epson Stylus Photo Service Manual

2.1.1.3 Paper Feed Mechanism and Pump Mechanism

Mechanisms that send the paper in the hopper to inside the printer and perform constant paper
feed in order to perform printing on the sent paper are called paper feed mechanism as generic name.
In the EPSON Stylus Photo, 4-phase, 200-pole hybrid type pulse motor is used in the PF motor as a
motive power for the paper mechanism and driving is done at 2-2 and 1-2 phase drive method.
This motor is not only used as a power source for paper feed mechanism but also used as power source
for pump mechanism which is necessary for the print head cleaning. By using this pulse motor, it becomes
possible to use high speed drive or intermittent drive for the various paper feeds and pump operations,
such as paper feed, slight paper feed, high and low speed absorption of pump operations. Following
tables(Table 2-7 and 2-8) show PF motor specifications and control method at each mode.
Motor type
Drive voltage
Coil Resistance
Drive frequency
Control method
Mode
Paper feed A
Slight paper feed
Slight paper feed
High speed attraction of pump
Low speed attraction of pump
Low speed paper feed
Paper feed B
Paper feed C
Ordinal absorption of pump
Following tables show 1-2phase drive method at PF motor drive and each drive sequence at 2-2phase
drive method.
Step No.
1
2
3
4
Step No.
1
2
3
4
Rev. A
Table 2-7. PF Motor Specification
Item
Table 2-8. Motor Control Method at Each Mode
Drive Method
2-2 phase
1-2 phase
1-2 phase
2-2 phase
1-2 phase
1-2 phase
2-2 phase
1-2 phase
1-2 phase
Table 2-9. 1-2 Phase Drive Method
Clockwise
Phase A Phase B
+2/3
0
-2/3
-1
-2/3
0
+2/3
+1
Table 2-10. Drive Sequence at 2-2 Phase Drive
Clockwise(CW)
A B
+2/3 +2/3
-2/3 +2/3
-2/3 -2/3
+2/3 -2/3
Chapter2 Operating Principles
Description
4-phase/200-pole Stepping motor
42VDC 5%
7.8 ohms 10%
(per 1 phase under 25 C environment)
400-4320Hz
Bi-Pola Drive
Drive Frequency
[Hz]
4320
400
2400
4100
1800
1200
3400
4000
4100
Counter clockwise
Phase A
+2/3 +2/3
+1 +1
+2/3 +2/3
0 0
-2/3 -2/3
-1 -1
-2/3 -2/3
0 0
Counter clockwise(CCW)
A
+2/3
+2/3
-2/3
-2/3
Pulse Space
(ƒÊs)
231
2500
417
243
555
833
294
250
243
Phase B
+2/3
0
-2/3
-1
-2/3
0
+2/3
+1
B
+2/3
-2/3
-2/3
+2/3
2-11