Pump Mechanism - Epson Stylus 1500 Service Manual

Operating Principles

Pump Mechanism

The paper feed motor drives the pump mechanism when the transmission gear moves to where the
motor engages the pump mechanism gear trains (when the carriage unit is at the ink system home
position). Release cam set engages (Figure 2-11) and disengages (Figure 2-13) the pump mechanism
to switch to paper feed (Figure 2-14). Figure 2-12 shows a block diagram. Pump system operation
depends on the rotational direction of the paper feed motor, as shown in Table 2-6.
Switching to the Pump Function
Disengage Mechanism
Carriage Unit Switch Lever
Release Cam Set Lever
Release Lever
ASF Transmission Set Lever
Carriage Unit Switch Lever
Release Cam Set Lever
Disengage Mechanism
Release Cam
Disengage Ge ar
Direction of Carriage Transfer
Direction of Release Cam Transfer
Compression Spring
Figure 2-11. Release Cam Set
Carriage Unit
PF Motor Pinion Gear
PF Motor
Switch Lever
Disengage Gear
Release Cam
PF Roller
Pump Unit
Figure 2-12. Pump Mechanism Function
2-12 Rev. A