Epson LQ 1050 Technical Manual - Page 93

Table 2-9. Carriage Speed Modes

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2.3.5.2 Carriage Motor Software Control This section describes the carriage motor software control. Software Control System The carriage motor speed is controlled by the printer firmware. Various types of characters (NLQ: Near Letter Quality, Draft, and condensed) can be printed by controlling the print and paper feed mechanisms lnd the carriage motor speed. The printer has the six speed modes shown in Table 2-9. Table 2-9. Carriage Speed Modes Speed Mode I Cerriage Speed I Excitation System I Description pps Phase 1 3840 2-2 High speed skipping 2 2640 2-2 Draft ESC K. ESC Y 3 I 2134 I 2-2 I ESC*5 4 1280 1-2 ESC*6, Draft half, emphasis, NLQ ESC L, ESC Z, ESC"4 5 1067 1-2 ESC*7 6 640 1-2 emphasis-condensed NLQ-Condensed Double height Note: The carriage speeds and number of PPS (pulse per second) for the 1-2 phase excitation system are transformed into these for the 2-2 phase excitation system. q Speed Control Since a stepper motor is used as the carriage motor, holding at any position and reversing the printing direction are possible. The carriage motor control uses an open-loop system, and the carriage position is synchronized with the phase switching by the firmware. Acceleration, constant speed, and deceleration control is performed as described below. Acceleration control: The carriage motor is accelerated in accordance with the acceleration time table. The acceleration time varies depending on the speed mode. Table 2-10 shows the differences between the speed modes. Table 2-10. Acceleration/Deceleration Control Speed Mode 1 2 3 4 5 6 Carriage Speed Phase Excitation pps 3840 2-2 2640 2-2 2134 2-2 1280 1-2 1067 1-2 640 1-2 Acceleration/ Deceleration steps 36 24 24 48 48 48 Constant Speed ins/step 0.286 0.379 0.469 0.391 0.469 0.781 2-49

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2.3.5.2 Carriage Motor Software Control
This section describes the carriage motor software control.
Software Control System
The carriage motor speed is controlled by the printer firmware. Various types of characters
(NLQ:
Near
Letter Quality, Draft, and condensed) can be printed by controlling the print and paper feed mechanisms
lnd
the carriage motor speed. The printer has the six speed modes shown in Table 2-9.
Table 2-9. Carriage Speed Modes
Speed Mode
I
Cerriage Speed
I
Excitation System
I
Description
pps
Phase
1
3840
2-2
High
speed skipping
2
2640
2-2
Draft
ESC
K.
ESC
Y
3
I
2134
I
2-2
I
ESC*5
4
1280
1-2
ESC*6,
Draft half, emphasis,
NLQ
ESC
L,
ESC
Z,
ESC”4
5
1067
1-2
ESC*7
6
640
1-2
emphasis-condensed
NLQ-Condensed
Double height
Note: The carriage speeds and number of
PPS
(pulse per second) for the 1-2 phase excitation system
are transformed into these for the 2-2 phase excitation system.
Speed Control
Since a stepper motor is used as the carriage motor, holding
at
any position and reversing the printing
direction are possible. The carriage motor control uses an open-loop system, and the carriage position
is synchronized with the phase switching by the firmware. Acceleration, constant speed, and
deceleration control is performed as described below.
Acceleration control:
The carriage motor is accelerated in accordance with the acceleration time table. The acceleration time
varies depending on the speed mode. Table 2-10 shows the differences between the speed modes.
Table 2-10. Acceleration/Deceleration Control
Speed Mode
Carriage Speed
Phase Excitation
Acceleration/
Deceleration
Constant Speed
pps
steps
ins/step
1
3840
2-2
36
0.286
2
2640
2-2
24
0.379
3
2134
2-2
24
0.469
4
1280
1-2
48
0.391
5
1067
1-2
48
0.469
6
640
1-2
48
0.781
2-49