Pump Mechanism - Epson Stylus PHOTO 2000P Service Manual

EPSON Stylus PHOTO 2000P

2.1.6.3 Pump Mechanism

The pump mechanism absorbs ink from the printhead and the cap
assembly. The wiper for head cleaning is included in the cap assembly.
The pump mechanism is driven by the ASF/Pump motor, a 4phase 48-
pole PM type stepping motor. See Table 2-12 for the ASF/Pump motor
specifications. When the torque from the ASF/Pump motor is switched to
the pump unit side, the pump mechanism acts differently according to the
directions of the ASF/Pump motor rotation, as shown in the table below:
Table 2-14. ASF/Pump Motor Functions
Table 2-15.
Directions
• Absorbs ink.
Counterclockwise
• Sets the wiper.
• Releases tube.
Clockwise
• Resets the wiper.
OPERATING PRINCIPLES
Corresponding Functions
Combination Gear 14, 28
ASF/Pump Motor Pinion Gear
Figure 2-9. Torque to the Pump Mechanism
Torque transmission to the pump unit
The torque from the ASF/Pump motor is transmitted to the pump
mechanism as described below:
1) The CR unit moves to the right end of the CR shaft, which then
pushes the DE lock lever to the right end.
2) The ASF-Pump motor rotates clockwise (viewed from the motor
pinion gear side) specified steps.
3) With the rotation of step 2), the planetary gear set in the DE unit
moves toward the combination gear (17.19, 25.6).
4) The CR unit moves specified steps from the right end of the CR
shaft to the left. With this motion, the DE lock lever fixes the
planetary gear set.
5) Torque from the ASF/Pump motor is transmitted as described
below.
Motor pinion gear
→
(17.19, 25.6)
Combination Gear 12, 22.4
Planetary Gear 15.2
A
DE Lock Lever
Tension Belt
Pump Unit Gear
Combination Gear 17.19, 25.6
Overview
→ →
Planetary gear (15.2) Combination gear
→ →
Tension belt Pump unit gear
Revision A
Pump unit
41