TM 5-6675-319-14
7-2.2 Location and Description of Major Components .
HEAD ASSEMBLY .
Consists of X- and Y-drive shafts, brackets, and screws which
c o n t r o l m o v e m e n t o f n e g a t i v e r i g h t , l e f t , f r o n t , a n d r e a r .
Lamphouse provides
light source using grid of fluorescent lamps which produces light of high visual
i n t e n s i t y a n d d i s t r i b u t e s i t u n i f o r m l y o v e r i m a g e a r e a .
FILM STAGE. Aerial negative is held in film stage for projection of image onto
easel.
Stage consists of two glass plates, stage plate, and pressure plate.
Negative is held flat against stage plate by pressure plate.
CENTRIFUGAL BLOWER. Used to circulate filtered air through lamphouse. This
prevents increase of temperatures at the film stage from the light grid which
c o u l d a f f e c t d i m e n s i o n a l s t a b i l i t y o f f i l m.
EASEL. Provides projection plane upon which photosensitive material is positioned.
Permanently magnetized paperweights are used to hold photosensitive material in
place during exposure.
Trough at front edge of easel prevents water from dripping
into base when wet photosensitive paper is used. Trough is drained by opening
valve to which rubber hose can be attached.
RIGHT SIDE ASSEMBLY.
Consists of column header, inversor unit, and tilt control
mechanism.
Column header maintains correct spacing of each column. Inversor unit
and tilt control are mechanical linkage systems that move lens support arm and easel
along guide bars in proper correlation to maintain sharp focus at easel during
m a g n i f i c a t i o n a n d t i l t o p e r a t i o n s .
7-2
