Epson LX-300 Service Manual page 34

Operating Principles
Table 2-2. PF Motor Assembly Specifications
Type
Drive Voltage
Coil Resistance
Drive Pulse Frequency
Excitation Method
Push Tractor Method
When the push tractor method is used with the rear entrance, the torque generated by the PF motor
assembly is transmitted to the push tractor gear through the PF motor assembly pinion gear, the
paper advance reduction gear, and the tractor transmission gear. When the PF motor assembly
pinion gear turns in the direction of the black arrows, the tractor gear rotates in the direction of the
black arrow and thus feeds the paper into the printer. The paper is advanced by the platen, which
is also driven by the PF motor assembly through the gear train.
Continuous Paper
/
Push
I tb I UH
PLATEN
COVER, ROLLER,
DRIVEN
Figure 2-4. Push Tractor Paper Advance Mechanism
2-4
4-phase, 48-pole, PM-type stepping motor
31.5 -38.5 VDC
56 ohms f (per phase, at 25°C, 77°F)
800,900,1000,1200,1300 pps
Constant-voltage 1-2 phase excitation
Tractor
PLATEN GEAR
Pinion Gear
LX-300 Service Manual
Requirement
MOTOR ASSY.,PF
- -