Ink System Mechanism - Epson Stylus Photo 2100 / 2200 Service Manual

EPSON Stylus PHOTO 2100/2200

2.2.5 Ink System Mechanism

The Ink system mechanism consists of the Pump unit (including the Carriage lock
lever) and Capping mechanism. The Cap unit is in close contact with the CR unit and
drains ink from the Ink cartridge to Head cavities to Cap to Waste ink pad using the
driving force of the Pump unit.
2.2.5.1 Pump Mechanism
The Pump mechanism is designed to suck ink from the Printhead or Cap assembly. The
Cap assembly has a built-in head cleaning wiper. The following gives the operation
outline of the Pump mechanism.
To provide the driving force of the Pump mechanism, a 4-phase, 48-pole PM type
stepping motor is used as the ASF/Pump motor. For the specifications of the ASF/
Pump motor, refer to 2.2.3.1 Table 2-9 "ASF/Pump Motor Specifications".
When the driving force of the ASF/Pump motor is switched to the Pump unit side by
the DE mechanism, the functions of the Pump mechanism are as indicated in the
following table depending on the rotation direction of the ASF/Pump motor.
Table 2-14. ASF/Pump Motor Rotation Directions and Functions
ASF/Pump Motor Rotation
*a
Direction
CW direction
CCW direction
*a: Pump rotation direction (Clockwise direction as viewed from
the pump drive input gear is defined as forward rotation)
The next section gives the path in which the driving force of the ASF/Pump motor is
transmitted to the Pump mechanism.
OPERATING PRINCIPLES
Functions
Pump suction
Wiper setting
Pump release
Wiper resetting
Printer Mechanism
2.2.5.2 Drive Transmission Path to Pump Unit
1. The Carriage unit moves to the right end of the Carriage guide shaft to move the
DE lock lever to the right end.
2. The ASF/Pump motor rotates in the CW direction (as viewed from the motor
pinion side) by the specified number of steps.
3. As the ASF/Pump motor rotates in the CW direction by the specified number of
steps, the Planetary lever unit in the DE unit moves toward the Combination gear
17.19, 25.6.
4. As the CR unit moves leftward from the right end of the Carriage guide shaft by
the specified number of steps, the DE lock lever fixes the Planetary lever unit in
position.
5. The driving force of the ASF/Pump motor is transmitted in the following path.
Motor pinion gear → Planetary lever unit → Combination gear 17.19, 25.6 →
Tension belt → Combination gear 12, 29.92 → Spur gear 26.4 → Pump unit gear
→ Pump unit
The following shows the part names and operation outline of the DE mechanism.
Combination gear 14, 28 Planetary lever unit
Combination gear
12, 22.4
Combination
ASF/Pump motor
gear 17.19, 25.6
pinion gear
Figure 2-13. DE Mechanism Outline
Revision A
DE lock lever
Tension belt
Combination gear Pump unit gear
12. 29,92
Spur gear 26.4
58