Carriage Drive Mechanism; Platen Gap Adjust Lever - Epson STYLUS 4001968 Service Manual

Operating Principles

2.2.2 Carriage Drive Mechanism

The timing belt attached to the base of the carriage unit is driven by the carriage motor, causing the
carriage unit to
move along the carriage guide shaft left to right, or vice versa. The carriage
motor on this printer is a 4-phase, 200-pole, hybrid-type stepping
printer to stop the carriage or change the carriage movement at any position. The position of the
carriage is recognized by the home position sensor and position information is fed back to the
carriage drive control circuit to determine the motor phase switching mode.
Table 2-1. Carriage Drive Motor Specifications
Item
Motor Type
Drive Voltage
Coil Resistance
Drive Frequency
Excitation Mode
2.2.2.1 Platen Gap
Adjust Lever
Set the platen gap adjust lever, attached to the carriage unit, to an appropriate position for the
paper thickness used for printing.
Table 2-2. Platen Gap Adjust Lever Position
Paper Type
Cut sheet
Envelope
Plain paper, Bond paper
I
4-phase / 200-pole hybrid-type stepping motor
35 V f 10Yo (31.5 -38.5 V)
10.0 Qt 7%/ pole (at 25° C, 77° F)
960 -5400 pps
1-2 phase excitation
Figure 2-4. Carriage Drive Mechanism
Lever Position
Horizontal (A)
Vertical (B)
\
r
Figure 2-5. Platen Gap Adjust Lever
STYLUS 800 Service Manual
motor mechanism, allowing the
Description
Platen Gap
—
+0.7 mm
Envelope
. . . . . . . . . . . . . :
. .
)
drive
.
I