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Epson Stylus COLOR 800 Service Manual: Pump Mechanism

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EPSON Stylus &2/25 800 Pump Mechanism

The functions of the Pump mechanism, which is composed of the Pump motor, Slider mechanism, and
Disengage mechanism, are Absorbing black/color ink from the capping unit, false absorption, and setting
and resetting of the wiper. When the CR returns to the CR home position, it pushes the slider in the Slider
mechanism to the right end. That movement engages the Gear 16 in the slider mechanism with the
Change Cam in the Disengage mechanism. Then the Change Cam switches to the Pump mechanism
side when the Pump motor rotates clock wise with the specified steps, and the drive from the Pump motor
is transmitted to the Pump mechanism. The torque is transmitted to the Pump side via the Disengage
mechanism in the following order:
1. Disengage mechanism switch process
2. CR shifts to the home position.
3. Slider shifts the right end. (Slider mechanism)
4. The Gear 16 is engaged to the Change Cam. (Slider mechanism)
5. The Change Cam switches to the pump side. (Disengage mechanism)
6. The Combination Gear 14.4, 21.6 shifts to the right. (Disengage mechanism)
The following figure shows how the gears are engaged.
‰Transmission process of the Pump motor's torque
1) Pump motor pinion gear
4) Pump drive shaft
7) Pump unit
Note) This order is irrelevant to the order indicated with arrows in the figure above.
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Figure 2-11. Pump Mechanism
2) Combination gear 12, 26
5) Gear 21.6
3) Combination gear 14.4, 21.6
6) Pump reduction shaft
Rev. A




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