Operating Principles
LQ-300
Service Manual
Table 2-2. PF Motor Specifications
Category
Requirement
Type
4-phase, 48-pole, PM-type stepping motor
Drive Voltage
31.5 -38.5 VDC
Coil Resistance
58.5
Q
*
5% (per phase, at 25°C,
77°F)
Drive Pulse Frequency
800,900, 1000, 1200, 1300
ppS
Excitation Method
Constant-voltage 1-2 phase excitation
Push Tractor Method
When the push
&actor
method is used with
the
rear entrance, the torque generated by the
PF
motor
is transmitted to the push tractor gear through the
PF
motor pinion gear, the paper advance
reduction gear, and the tractor transmission gear.
When the
PF
motor 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 through the gear train.
Continuous Paper
/
push Tractor
PE
\&@
\
o
-1.
.
/
/
I ractor
5
Transmission Gear
d
~P
P&
Tractor Gear
‘b
/
w-
-0
‘aperAdvance
~
Reduction Gear
Sensor
Platen
Driven Roller Cover
Platen Gear
Pinion Gear
\
PF Motor
Figure 2-4. Push Tractor Paper Advance Mechanism
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