Carriage (Cr) Mechanism - Epson STYLUS COLOR 3000 Service Manual

Operating Principles

Carriage (CR) Mechanism

The CR mechanism is composed of the CR unit, timing belt, CR guide shaft, paper eject frame, HP (Home
Position) sensor, and CR motor. The CR motor turns the timing belt, which moves the CR unit right and left
along the paper eject frame and the CR guide shaft. The CR motor is a stepper motor, which enables the CR
unit to move and stop at any position. The CR is detected at the home position by the HP sensor when the
printer is turned on. Its position is controlled by an open loop. Table 2-2 and Table 2-3 show the
specifications for the CR motor and the CR motor control variables, respectively.
Item
Motor type
Drive voltage
Coil resistance
Active mode
Drive frequency
Minimum step
Print Print
mode speed
Draft 400 cps
LQ 200 cps
SLQ 100 cps
Sub Pulley
Paper Eject Frame
2-4
Table 2-1. CR Motor Specifications
4-phases / 200-pole / Hybrid-type stepper motor
42 VDC ± 5% (Applied to the driver)
5 Ω ± 7% (at 25° C per 1 phase)


Bipolar drive


2-2 phase, 1-2 phase, W 1-2, 2 W 1-2 phase, 4 W 1-2 phase


Constant current drive
480 to 9600 Hz
0.202 mm (2-2 phase drive)
0.106 mm (1-2 phase drive)
0.053 mm (W 1-2 phase drive)
0.026 mm (2 W 1-2 phase drive)
0.013 mm (4 W 1-2 phase drive)
Table 2-2. CR Motor Control Variables
Acceleration Acceleration
1 2
0.91 0.91
0.91 0.91
0.63 0.63
CR Unit
Timing Belt
CR Guide Shaft
Figure 2-4. CR Mechanism
Description
Constant Deceleration
1
0.63 0.91
0.49 0.63
0.49 0.63
Pulley
CR Motor
HP Sensor
EPSON Stylus Color 3000 Service Manual
Deceleration
2
0.91
0.63
0.63