Carriage (Cr) Mechanism - Epson Stylus Color 1520 Service Manual

2.2.3 Carriage (CR) Mechanism

The CR mechanism is composed of the CR unit, CR motor, timing belt, CR guide shaft, paper eject frame,
and HP sensor (Home Position sensor). Torque from the CR motor is transmitted via the timing belt to the
CR unit right and left along the paper eject frame and CR guide shaft, depending on the way the CR motor
rotates. 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 2-3 show the specifications for the CR motor and its drive
frequencies.
Item
Motor type
Drive voltage
Coil resistance
Excitation mode
Drive frequency
Minimum step
Print Print speed
mode
Draft 400 cps
LQ 200 cps
SLQ 100 cps
Sub Pulley
Paper Eject Frame
Table 2-2 CR Motor Specifications
4-phase / 200-pole / HB-type pulse motor
42 VDC ± 5%
5 Ω ± 7% at 77° F (25° C) per phase
Unipolar drive
1-2 phase, 2w 1-2 phase: Constant current drive
480 ~ 9600 Hz
0.106 mm / pulse (1-2 phase drive)
0.026 mm / pulse (2 W 1-2 phase drive)
Table 2-3 CR Motor Driver Terms
Acceleration Acceleration
1 2
0.96 0.96
0.96 0.96
0.90 0.90
CR Unit
Timing Belt
CR Guide Shaft
Figure 2-4. CR Mechanism
Description
Constant Deceleration
1
0.70 0.70
0.70 0.80
0.60 0.80
Pulley
CR Motor
Operating Principles
Deceleration
2
0.70
0.80
0.80
HP Sensor
2-5