Asf Paper Feeding Mechanism; Asf Motor Specifications - Epson Stylus Photo R1800 Service Manual

EPSON Stylus Photo R1800/R2400

2.2.3.1 ASF Paper Feeding Mechanism

The following shows the specifications of the stepping motor that drives the
ASF Assy.
Table 2-5. ASF Motor Specifications
Item
Type
Drive voltage
Winding resistance
Inductance
Drive method
Drive IC
Driven by the ASF Motor, the ASF Assy performs the following feeding
operation.
1. When a paper feeding command is issued from the PC or the Paper Switch
of the panel is pressed after power-on, the driving force of the ASF Motor
begins to be transmitted to the LD Roller following the route shown below.
Combination Gear 29, 11
LD Shaft Spur Gear
2. When the LD Roller starts rotating, the Flag of the ASF Sensor Wheel
comes free from the notch on the ASF Sensor. And at the same time, the
Paper Back Lever becomes free from the Cams located at the left and right
ends of the LD Roller, then the Paper Holder on the Paper Back Lever
inclines downward by tensile force of the Paper Back Lever Torsion Spring.
3. By the LD Roller's rotation, the Hopper is released from the Hopper Cams
located at the left and right ends of the LD Roller, and the Hopper pops up
by tensile force of the Hopper Compression Spring.
Operating Principles
Specifications
4-phase, 48-pole PM type stepping motor
+42V ± 5% (voltage applied to driver)
7.0Ω ± 10% (per phase at 25°C)
10.2mH ± 20% (1kH, 1Vrms, 25Åé)
Bipolar drive/constant-current drive
A6628
ASF Motor
LD Roller
4. When the next sheet of paper is fed by the LD Roller and the Retard Roller,
the Hopper is pressed against the Frame again by the Hopper Cams. And
the Paper Holder of the Paper Back Lever rises by the Cams at the left and
right ends of the LD Roller to prevent the next sheet from being fed with the
previous sheet.
5. The LD Roller stops to rotate when it makes one revolution and the Flag of
the ASF Sensor Wheel returns to the ASF Sensor.
Printer Mechanism
Revision B
21