Paper Feed Mechanism - Epson LQ-1050 Technical Manual

2.1.2.3 Paper Feed Mechanism

The paper feed mechanism feeds the paper after the printing mechanism and the carriage mechanism
finish printing one line. The paper feed motor is driven to rotate the platen
gears. The paper feed mechanism includes two sensor mechanisms: A paper end sensor to detect the
presence/absence of the paper, and a friction/tractor sensor to detect the paper feeding mode (push
tractor feed or friction feed).
The paper feed mechanism has been enhanced with a new automatic paper ejection feature and an
automatic paper back-out feature. These new features are controlled by the firmware to improve paper
handling. Table 2-5 lists the specifications of the paper feed mechanism and Table 2-6 lists the
relationship between paper type and various paper feed operations.
Paper Feed Motor
Type Number
of step
Hold
PM 4 8
stepper
motor,
4 phases
Paper Release Lever Position
Paper Type
Paper Feeding Method
Paper Tension Unit
x: Needless
Optional, the detail is described in Chapter 3.
Table 2-5. Paper Feed Mechanism Specification
Drive Voltage Control
Method
Run
35 Open
loop
Table 2-6. Paper Feeding Method and Paper Type
Friction
Cut Sheet
Normal
o
Paper
Feeding
Driving
Per/Step
Method
["/step]
Paper
1/1 80
Gear
end
mission
Push
x o
2-7
tractor via the paper feed
or
Sensor Drive Voltage
Hold
Friction/ 5
tractor
Tractor
Continuous
Pull*'
x
Solenoid ,
Pull
35
Push-Pull
x