Epson LX-1050+ Service Manual page 31

Push Tractor Feed Operation
When the push tractor unit is used, the paper is set such that its holes mesh with the tractor pins
along the tractor belt. The paper feed motor is driven and, via the pinion on the motor shaft, rotates
the gears in the direction shown in following figure, rotating the tractor belts. This causes the paper
advances in the direction indicated by the arrow. When push tractor feeding is used, the pressure
of the paper feed rollers against the platen is released by moving the paper release lever to its
forward setting.
Paper-feed motor specifications are as follows:
4phase, 48-pole step motor
Type:
Drive Voltage:
24 VDC * 10Yo
Coil Resistance:
40 ohms*
Phase Excitation: 2-2 phase
Maximum, 1.1A (Rush Current, 26.4 VDC)
Current:
Driving: 0.30 A (Typ., 480 pps, 24 VDC)
Holding: 0.06 A *20 rnA
Driving Frequency: 480 PPS
Rev. A
Figure 2-6. Tractor
at 25°C
Feed Operation
Operating Principles
e a r
G e a r
Motor
2-5