b. Condenser lens set (figure
2-6).
The condenser lens set
concentrates the light from the
lamp
house
and
distributes
it
uniformly over the negative.
The
condenser lens set consists of a
pair of 6 1/2-inch diameter plano-
convex lenses, each having a focal
length of 9 inches. The lenses are
mounted
in
a
housing
with
a
separator
between
them.
The
housing
has
three
bayonet-type
notches to permit assembly to the
variable condenser lens housing
where it is secured with knurled
screws.
FIGURE 2-6. Condenser lens set,
exploded view.
c. Carriage assembly (figure 2-5). The carriage assembly mounts on the
girder assembly and supports the movable portion of the printer.
The
control lever and the lifting levers mounted on the carriage assembly
support the lamp house assembly and the condenser lens set.
d. Girder assembly (figure 2-5).
The girder assembly forms a rigid
support for the carriage assembly.
Gear racks at the back of the girder
channels provide for raising and lowering the carriage assembly.
Two
balance springs, mounted on the top of the girder and attached to the
carriage assembly, counterbalance the weight of the carriage assembly.
e. Baseboard assembly, EN-91A (figure 2-7).
The baseboard assembly
consists of a wooden baseboard and a steel baseboard plate that forms the
mounting support for the girder assembly. Three rotary clamping pads secure
the girder assembly to the baseboard.
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