Pump, Carriage Lock, Head Cleaner Mechanism - Epson STYLUS Scan 2000 Service Manual

EPSON Stylus Scan 2000
2.2.6 Pump, Carriage Lock, Head Cleaner
Mechanism
n the EPSON Stylus Scan 2000, there is no switch or mechanism to switch
between the ink pump and paper feed operations. Therefore, whenever the
paper feed/pump motor rotates, the pump-drive roller inside the pump unit
rotates. However, the rotational direction of the rollers determines whether or
not the pump sucks ink. Also, even if the pump rotates in the ink-absorption
direction, ink is not absorbed if the carriage is in the false-absorption position.
Figure 2-13 shows process of conveying motive power to the pump drive
roller.
The process of conveying the motive power to the paper eject roller is shown
in Figure 2-15. This motive power is conveyed to Gear C through Gear B. The
lever that drives Gear C, the carriage lock, and the head-cleaner mechanism is
shown separately but it is constructed as one unit. Since the engagement of
these parts depends on the tension of the compression spring, if the lever is
burdened, only Gear C and the pump roller rotate and no more motive power is
conveyed to the lever part.
Operating Principles
Axis of
Paper
eject
roller
Gear C
Figure 2-15. Pump Mechanism Power Transmission Process
The table below shows PF/Pump motor rotational direction and pump system
operation.
Printer Mechanism Operation
Gear A
Gear B
Compression
spring
Pump drive
roller
Revision A
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