Paper Feed Mechanism - Epson STYLUS 3000 Service Manual

2.2.4 Paper Feed Mechanism

The paper feed mechanism of this printer consists of the integrated ASF (Auto Sheet Feeder) mechanism,
tractor mechanism, PF (Paper Feed) motor, front/rear PE (Paper End) sensors, PF roller, paper guide
mechanism, paper eject unit, and PF motor drive disengage mechanism. The torque from the PF motor
drives the paper load mechanism, paper feed mechanism and paper eject mechanism. While the printer
is not printing, the PF motor drive disengage mechanism switches the torque sent from the PF motor to
the ASF mechanism, which depends on the
torque from the PF motor is transmitted via PF motor pinion gear and disengage gear to the PF roller,
where the torque splits in 2 directions: one is to the paper eject mechanism via the gear train in the paper
guide assembly and the other is to the ASF mechanism via the transmission gear. The tractor drive gear
train is set at the left end of the PF roller. Table 2-3 and Table 2-4 shows the specification for the PF motor
and PF motor drive terms, respectively. Figure 2-5 illustrates the paper feed mechanism.
Item
Motor type
Drive voltage
Coil resistance
Connection
Excitation mode
Minimum step
Operation
mode
Paper feed
ASF Feed
Pump driven
Pump driven
(slow)
Note) Double 1-2 phase drive / 2-2 phase drive
Rev. A
position. While the paper feed mechanism is driven, the
Table 2-3. PF Motor Specification
4-phases / 96-pole / Hybrid type stepping motor
42 VDC 5% (The voltage applied to the driver)
10 10% (at 25 C per 1 phase)
Bipolar
2-2 phase, 1-2 phase, W1-2 phase constant current drive
1/720 inch / step (2-2 phase drive)
Table 2-4. PF Motor Drive Terms
Acceleration Constant
0.9/0.9
0.9/0.9
/0.9
/
Figure 2-5. Paper Feeding Mechanism
Description
Deceleration
0.9 0.75/0.75
0.9 0.75/0.75
0.9 0.9
0.9
/
EPSON Stylus COLOR 3000
Stand-by
0.6
0.6
0.6
0.6
2-5