Pump Mechanism - Epson Stylus Color 400 Service Manual

Chapter2 Operating Principles

2.1.1.4.1 Pump Mechanism

In the Stylus Color 400, there is no switch or mechanism to change over the pump/paper feed
mechanism. Therefore, whenever the paper feed/pump motor rotate, pump drive roller in the pump unit
inside rotates. However, ink absorption/non ink absorption are separated by the roller rotational direction.
Also, even if the pump driver rotates toward ink absorption and the carriage position is in the false
absorption position, only driving in the pump mechanism is performed and actual ink attraction is not
done. The figure below shows process of conveying motive power to the pump drive roller.
Figure 2-14. Pump Mechanism Power Transmission Process
The process of conveying the motive power to the paper eject roller by rotating the pinion of PF motor
is descried in figure 2-12. This motive power is conveyed to the Gear C through the Gear B.
In the figure above, although the lever in order to drive Gear C, carriage lock, head cleaner mechanism
is shown separately, it is constructed as one unit. Since the engagement of these two parts depends on
the tension of the compression spring, if the lever is burdened, only Gear C and pump roller rotate and no
more motive power is conveyed to the lever part.
2-15
Rev.A