EPSON Stylus Photo R800
Revision A
OPERATING PRINCIPLES
Printer Mechanism
26
2.2.5 Ink System Mechanism
The Ink System Mechanism consists of the following mechanisms.
Pump Unit (including the CR Lock Lever)
Cap Unit
2.2.5.1 Pump Unit
The Pump Unit is designed to suck ink from the Print Head or Cap Unit. The
Cap Unit has a built-in Head Cleaning Wiper.
The following indicates the Pump Unit driving stepping motor specifications.
The following operations are performed when the drive of the Pump Motor is
transmitted to the Pump Unit.
Note: As the rotation directions of the motor, CW indicates a clockwise
direction, and CCW indicates a counterclockwise direction, as seen
from the output shaft side of the motor mounting plate.
2.2.5.2 Drive Transmission Path to Pump Unit
The drive of the Pump Motor is transmitted to the Pump Unit in the following
path.
Motor Pinion Gear
⇒
Combination Gear 10.2, 21.2 IS
⇒
Spur Gear 20.4 IS
⇒
Pump Unit
The following shows the internal part names and operation outline of the Pump
Unit.
Figure 2-9. Outline of Pump Unit Inside
Table 2-7. Pump 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
10.3
Ω
± 10% (per phase at 25°C)
Drive method
13.4mH ± 20% (1kH, 1Vrms)
Table 2-8. Pump Motor Rotation Directions and Functions
Pump Motor Rotation Direction*
Functions
CW direction
• Cap closing
• Ink suction
• Wiper resetting
• CR Lock setting
CCW direction
• Cap opening
• Pump release
• Wiper setting
• CR Lock resetting
Motor Pinion Gear
<
Pump Unit inside
>
Combination Gear 10.2, 21.2 IS
Spur Gear
20.4 IS
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