b. Condenser lens set (figure
26). 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 1/2inch 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 bayonettype
notches to permit assembly to the
variable condenser lens housing
where it is secured with knurled
screws.
FIGURE 26. Condenser lens set,
exploded view.
c. Carriage assembly (figure 25). 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 25). 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, EN91A (figure 27). 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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