Pump/Asf Motor And Switching Mechanism - Epson Stylus COLOR 900 Service Manual

EPSON Stylus COLOR 900/900N

2.2.3 Pump/ASF Motor and Switching Mechanism

The pump/ASF switching mechanism switches the motor's torque
between the auto sheet feeder and the pump mechanism. The pump/
ASF motor supplies torque, and a solenoid is used as the switching
trigger.
Driving the ASF Unit
To drive the ASF unit, the pump/ASF motor transmits torque through
the planetary gear set to the ASF transmission gear. At this time, the
drive motor may turn either clockwise or counterclockwise. However,
when the motor turns counterclockwise, the planetary gear set would
rotate downward if unchecked. To keep the gears engaged, the
solenoid latch holds them in place.
.
Figure 2-3. Pump/ASF Switching Mechanism
When the pump mechanism needs to be driven, the motor turns
counterclockwise and the solenoid is momentarily activated, letting the
planetary gear set swing downward and engage the pump transmission
gear. After the gears engage, the solenoid latch holds the planetary
gear set in place.
Chapter 2 Operating Principles
Driving the Pump Mechanism
37