Epson Stylus Photo RX700 - Paper Feed Mechanism; PF Motor Specifications; PF Encoder

EPSON Stylus Photo RX700 Revision A
Operating Principles Mechanism Operating Principles 26
2.2.4 Paper Feed Mechanism
The paper feed mechanism, consisting primarily of the PF Motor, PF Roller Assy and
Paper Eject Rollers (x2), transports the paper from the paper loading mechanism and
ejects it to the front.
2.2.4.1 PF Motor Specifications
 Paper feed direction
2.2.4.2 PF Encoder
 Detector specifications
Figure 2-14. Components of Paper Feed Mechanism
Item Specifications
Type DC brush motor
Voltage 42 V (DC voltage) ± 5% (voltage applied to the driver)
Characteristics
Armature
resistance
26.4Ω ± 10%
Inductance 16.7mH (1KHz)
Inertia 12.4 gcm
2
Drive system PWM system, constant-current chopping system
Paper Feed Direction Direction of Motor Rotation Current
Normal CW PF-A
→ PF-B
Reverse CCW PF-B → PF-A
Item Specifications
Detection method (SHARP GP1A038CKL)
Electrical
characteristics
Supply
voltage
3.3 VDC ± 5%
Current 16 mA (40 mA MAX) 120Ω
Output waveform Phase A and phase B 2-channel digital output (TTL)
Output level
“H” 2.4 V DC min.
“L” 0.4 V DC max
Resolution 1/180 pulse/inch
Signal detecting element Photo interrupter
Duty ratio 50% ± 20%
Output phase difference 90° ± 54°
Frequency response 20kHz
PF Motor
Front Paper Eject Roller Shaft
Idle Roller Shaft Assy
Rear Paper Eject Roller Shaft
Upper Paper Guides
PF Encoder
PF Roller Holder Support Assy
CD-R Sensor 1
Detects the position (PG++) of the
Upper Paper Guides
PE Sensor
Detects the presence of paper.
EJ Frame Assy
PF Roller Assy
When the Upper Paper
Guides have been
located at the PG++
position, the actuator
moves and the sensor
detects the position.