Epson 900N, Service Manual

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EPSON Stylus COLOR 900/900N Chapter 2 Operating Principles
39
2.2.5 Pump Mechanism
The pump mechanism includes the carriage lock and head cleaner
mechanisms, as well as the ink pump itself (pressure rollers).
Figure
2-5 shows how they are combined.
Figure 2-5. Pump, Carriage Lock, and Head Cleaner Mechanisms
As shown below, the pump mechanism includes two pressure rollers.
Only one of them pumps ink at a time, depending on which direction the
ASF/pump motor is turning.
Figure 2-6. Pump Mechanism
C l u t c h
S p a c e r
C o m p r e s s i o n s p r i n g
C l e a n e r h e a d
F r a m e
U n l o c k e d
L o c k e d
O n t h e
s a m e s h a f t
I n t h e p u m p g e a r t r a i n c o n d i t i o n
P u m p i n t e r m i t t e n t g e a r
P u m p t r a n s m i s s i o n g e a r
P r e s s u r e r o l l e r
( l e f t )
P r e s s u r e r o l l e r
( r i g h t )
CR Lock
Pump transmission
gears
Head cleaner
ASF/pump
switching
mechanism
S e p a r a t o r
C C W
C W
Connector