PRINCIPLES OF OPERATION
Push-Tractor-Feed Operation
When the push tractor unit is used, paper is loaded so 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 Figure 2-59, rotating the tractor belts. This causes the tractor belt to move, and 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 Tension Roller
,,
Paper (Continuous)
.b
Tractor Reduction Gear
I
Tractor Gear
Paper Feed
Reduction Gear
Paper Feed
/Motor Pinion Gear
r Feed Motor
Figure 2-59. Push-Tractor-Feed Operation
2.3.5.2 Paper-Feed Motor Specifications
Paper-feed motor specifications are as follows:
Type
Drive Voltage
Coil Resistance
Phase Excitation
Current
Driving Frequency
Four-phase, ± 48-pole stepper motor
24 VDC ± 10%
40 ohms ± 7% at 77°F(25
o
C)
2-2 phase or 1-2 phase excitation
Maximum, 1.1 A (rush current)
Driving:
0.30 A typical
Holding: 0.06 A ± 20 mA
400pps
2-52
LQ-510
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