THE
SPREAD
SYSTEM
Thl'
(Oller:..
lhl'IllSl'lvcs
p~rfonll
till'
ViI
"I
fUlll"!
iOI1
Till.'
spre,uJ
sysh~111
works
in
coojundioo
with
the
-
lilm pat:k
to
proct:$."
the
negative ilnd pO$itivc.
Thl."syskm.
Ibr
our
purposes.
\,,'an
be
considered
to
~Onslst
of
the roilers. the edge
control
bar and
slide
blod
assembly
:.lor.!
the
door
~pring
(!>Cl"
-
Figure
::!4t
-
In
Figures
2~1
through
2~3.
the
film pat:k
IS
shown
I();hj~
in
the
camera. The
:H:tion
of
the
pressnrl;!
pwte
kc~ps
tht!
top
negative
forced
agai.nst
the
window
of
the
p<lck.
The door spring, to turn,
ket':ps
the
entire
pack forced against
the
body
-
-
Olssembly, Tlnls.
the
pressure
plate
and
the
door
spring workmg together, guarantee thar
the
neg-
Siitive
being
exposed
is
at
tbe
appropriate
focaJ
plane.
The edge
conlrol
bar and slide block assembly
serve 'to funnel
the
yellow tab through
the
-
rollers. The slide block acts
as
a
movable
plat-
fonn
for
the edge controJ bar whleh has
both
-
lateral
and
vertical
movement.
The
bent
fingers
on
the
bar
catch
the
tab
and
direct
the
film
through the roUefS
in
a
straight
Jine.
(However.
they cannot
fOtaUy
prevent
bad
spreads caused
-
by film being pulled
out
of
the
camera
at extreme
angles.)
The
play in the edge control
bar
aJJows
the
assembly
to
move
with
the
tab
and
thus
avoids
any ripping
of
mm,
Note
that
the
top
roner
has
a shoulder
at
either
end.
They
provide
for a
separation
which
pennits the
tab
to
fit
through the rollers. When the rollers
are
freed
-
for
cleaning,
the
sliding block
moves
the
edge
bar
back
out
of
the
way.
-
-
-
-
-
-
-
of
evenly
dislributill~
thl'
d~vcIQrin!!jdl)
hl'-
tween
the
ne~livt'
and
(he
positiv
....
Ill,,' film
.,:;scmbly is
dt.'~ignl'd
so
tllil' Ih\.'
",idl>:'
or
tin: neg-
ative
;.mrJ
posilive arl' tightly l'Ompn:ssl'rJ hy
lhl'
r.Jils
while
Ihey
"rc
passing
through
rhe
roll~'rs"
Thi:s
prevents
lill.'
jelly
from
bl'ing
SqUt.'t.'l'l'U
out
lbe
sides.
or
(he
:.I)L~mbly
hel'
Figure
'::~5).
When
th~
jeJly
ha:.;
been
i!v~nly
s.pre~d
over
!he ,,'ntirl'
lenglh
of
the
positive,
the
~ap
in
the
roll\'r
j.,.
in-
creased
by
the
tr"ps
on
the
film
.,ss~mbl~,
This
permits"t~
excess jelly
to
be
trapped in
Ih~
p<Jpt:f
mask.
Otherwisc.
the
deveJopingjelly
would
be
squeezed
completely
out
of
the
pic-tuft! a:>\l'mbly
and
would
be
deposited
in
the
roUcr "re;L
SIDES ARE
COMPRESSED
BY
THE RAILS
rnA
PAPER
MASK
FIG. 2.5
FILM
BEING
PULLEO THROUGH
THE ROLLERS
ROLLERS
eDGE CONTROL
8AR
FINGERS
DOOR
,*:"'00
FIG. 2.4
VI
EW
OF REAR DOOR COMPONENTS
J
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