Epson Stylus Pro 7000 Series, Service Manual, Page: 70 / 231

EPSON Stylus Pro 7000 Revision B
Operating Principles Printer Mechanism Operation Outline 70
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.
Figure 2-17. Platen Gap Control
CR guide rail
Carriage
Bearings
Subcarriage
PG slide gear
PG cam
(Head SLID)
B/C
printheads
PG_HP sensor
PG_HP flag
Pump motor
(CCW)
View of right
side of carriage
View of right
side of
printer