Paper Feed Motor Speed Control - Epson LQ-1050 Technical Manual

2.3.8.2 Paper Feed Motor Speed Control

When the amount of paper to be fed is 14 steps or less (amount of paper feed step is 1/180 inch),
the paper feed motor is controlled to rotate at constant speed.
When the amount of paper to be fed exceeds 14 steps, the paper feed motor is accelerated and
decelerated.
Figure 2-65 shows the 2-2 phase excitation system drive sequence and Table 2-23 shows the paper
feed motor drive circuit specification, and Table 2-24 shows the paper feed speeds.
Table 2-23. Paper Feed Motor Drive Circuit Specification
Phase Excitation
Paper Feed Speed [PPS]
Set Time [ins/step]
Current (average) [A/motor]
Feeding Method
Mode
Cut Sheet [PPS]
(Paper feed speed IIPS])
Continuous Paper [PPS]
(Paper feed speed IIPS])
ON
A02
OFF
ON
C02
OFF
ON
OFF
ON
D02
OFF
Step
Rotation
Fig. 2-65. 2-2 Phase Excitation System
Speed Mode
Table 2-24. Paper Feed Speeds
I
I
I
I
1
2 3 4
I
I
5 5 0
1.82
o.17
Intermittent
Postcard
Normal
6 0 0 6 0 0
(3.3) (3.3)
5 5 0
(3.0)
2-63
I
2 - 2
I I
6 0 0 6 5 0
1.67 1.54
0.15 0.13
Continuous
Normal
Postcard
650
6 5 0
(3.6)
(3.6)
5 5 0
(3.0)
2