Carriage Movement Mechanism - Epson LQ-2170 Service Manual

Operating Principles

2.1.2 Carriage Movement Mechanism

The carriage movement mechanism consists of the carriage assembly, carriage (CR) motor, timing belt,
driven pulley, home position (HP) sensor, etc. The CR motor drives the timing belt. The carriage assembly
is connected to the timing belt, which is moved by the CR motor. Figure 2-2 shows the carriage movement
mechanism.
The printer detects the carriage home position with the HP sensor. This sensor is the basis for determining
the carriage position. The HP sensor informs the CPU when the carriage is at the home position. The sensor
is ON, when the carriage is pushed to the right or left. The striker on the carriage activates the sensor to
indicate the carriage is at the home position, which toggles the sensor to OFF.
Table 2-1. CR Motor Assembly Specifications
Category
Type
Drive Voltage
Coil Resistance
Inductance
Figure 2-2 Carriage Movement Mechanism
2-2
Requirement
4-phase, 200-pole, HB-type pulse motor
35 2.1 VDC
2.7 10%, per phase, at 25° C (77° F)
3.7 H 20% (per phase, at 1K Hz 1 V rms)
LQ-2170 Service Manual
Rev.A