Platen Gap Mechanism - Epson StylusPRO 7000 Service Manual

EPSON Stylus Pro 7000

PLATEN GAP MECHANISM

To produce high quality printouts, the printer must maintain a constant
distance between the printhead nozzles and the paper. To do this the printer
measures the thickness of the paper and adjusts the height of the carriage
accordingly.
The carriage is composed of two parts; the main carriage which is secured to
the CR guide rail via bearings, and the subcarriage which holds the
printheads. The subcarriage is secured with a cam, and due to the cam's
shape, the subcarriage can be raised or lowered depending on the rotation of
the cam. See Figure 2-17.
The platen gap adjustment is linear; the nozzle surface is constantly parallel to
the paper surface.
Operating Principles
Carriage
(Head SLID)
PG_HP flag
Printer Mechanism Operation Outline
CR guide rail
PG cam
B/C
printheads
PG slide gear
PG_HP sensor
Figure 2-17. Platen Gap Control
Revision A
View of right
side of carriage
Bearings
Subplaten
Pump motor
(CCW)
View of right
side of
printer
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