Paper Feed Mechanism - Epson LQ-300 + Service Manual

EPSON LQ-300+

2.2.5 Paper Feed Mechanism

This mechanism consists of paper feed motor (PF motor), paper feed gears, platen, rear
paper end detector, bottom paper end detector and push tractor unit. (Refer to Figure
2-2.)
Paper Feed Method
Friction feed
Push tractor feed
Uses standard push tractor
Push-pull tractor feed
Uses standard push tractor + Option tractor
Pull tractor feed
Replace the standard push tractor with option tractor
Feeder
Simple CSF (option)
Tractor (standard)
Push / Pull
Pull tractor (option)
Roll paper holder
Paper path
Manual loading
Rear paper load, top paper load
CSF
Rear paper load, top paper load
Push tractor
Rear paper load, top paper load
Pull tractor
Rear / Bottom paper load, top paper load
Auto loading
When loading paper manually, push paper between the platen and the driven paper
load roller. Paper will be loaded automatically.
Operating Principles
PF MOTOR
LQ-300+ uses stepping motor for PF motor. Open loop control switches the phases
according to the setting period and this mechanism loads and carries paper to the
appointed position and eject paper.
The table below is the PF motor specifications.
Table 2-10. PF Motor Specifications
Item
Motor type
Coil resistance
Control method
Phase drive
Drive voltage
Drive current
Paper feed pitch
Printer Mechanism
Specification
2-phase/96-pole Hybrid stepping motor
12.0Ω ±10% (25°C, per 1 phase)
bi-polar rated current drive
2-2 phase, 1-2 phase
35VDC, +5% -10%
(This voltage is added to driver.)
0.794A±8%, 0.709A±8%, 0.236A±8%
Minimum Resolution:
1/360" 1-2 phase, 2 pulse)
Revision C
39