EPSON Stylus Photo R800
Revision A
OPERATING PRINCIPLES
Printer Mechanism
21
2.2.3.1 ASF Paper Feeding Mechanism
The following indicates the ASF Assy. driving stepping motor specifications.
The drive of the ASF Motor is transmitted to the LD Roller in the following path.
LD Roller Drive Transmission Path
ASF Motor Pinion Gear
⇒
Combination Gear 29, 11
⇒
Paper Back Cam
⇒
LD Roller
Figure 2-5. LD Roller Drive Transmission Path
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.
2.
The flag of the Paper Back Cam moves away from the home position of the
ASF Sensor and the LD Roller rotates.
3.
When the LD Roller rotates one turn and the flag of the Paper Back Cam
returns to the home position of the ASF Sensor again, the LD Roller stops
rotating.
2.2.3.2 Manual Paper Feeding Mechanism (Board Paper)
To enable direct printing onto thick paper and CD-R label, this product has the
mechanism to feed paper from the printer front manually.
1.
When the Stacker is lifted, the close signal of the PG Release Sensor is
transmitted to the APG Assy. in the following order.
PG Release Sensor
⇒
Main Board
⇒
Relay Board
⇒
APG Motor
⇒
APG Assy.
2.
Driven by the APG Motor, the APG Assy. sets the PG position to PG
release to release the Upper Paper Guide (Driven Roller).
3.
Along the Paper Feed Guide of the Stacker, match the leading edge (front
side) of the board paper to the marking position of the Stacker.
After the above operation, press the Paper Switch. When the PE Sensor
detects that the paper is present, it detects the leading edge of the paper, and
the printer performs paper locating and then enters the standby status.
Table 2-5. ASF Motor Specifications
Item
Specifications
Type
4-phase, 48-pole PM type stepping motor
Drive voltage
Bipolar drive/constant-current drive
Winding resistance
+42V ± 5% (voltage applied to driver)
Inductance
7.4
Ω
± 10% (per phase at 25°C)
Drive method
12.0mH ± 20% (1kH, 1Vrms)
ASF Motor
LD Roller Shaft
Paper Back Cam
Combination Gear 29, 11
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