Argus C3 - Page 28

Now,
the
moin drivecolumnspins
in its
releose
rototion.
As
soon
os the
lotching
lug on
the
moin drive
column
Posses
from.under-
neoth
the
relu-ot"i-position
lotch,
the
spring-looded
.releosed-
position lotch
pushes'the
tronsfershoft
bockdown
--the
lower
end
of
the tronsfei
shoft
then
folls below
the
lug on
the
wind
com,
freeing
the
wind com
prior to
the next
cocking
cycle.
Now,
the releosed-position
lotch
is in.position
to cotch
the
lotching
lug
on the
moin
drivecolumn.
So the
moin drivecolumn
spins
in iti
releose
rototion
until
the
lotching
lug
once
ogoin
sirikes
the
reIeosed-position
lotch,
Fig. 33.
As the moin
drive
column
turns
in the
releose
rototion,
it
drives
the blode
operoting
ring
toopen
ond
close
the
shutter blodes.
The
link between'the
moin
drive
column
ond the blode
operoting
rins
is the
LEAF
LEVER,
Fi9.
35
(colled.the
"TOGGLE
PLATE,
bv-Arous).
Notice
thoi
one end
of the
leof
lever
rides
within
t(u
cJ,
groouu in the
moin drive
column --
the other
end
of the
leof
lever
engcrges
the blode
operoting
ring.
THIS
END OF
LEAF
LEVER
ENGAGES
FORKED
TAB
OF
BLADE
OPERATII'rG
RING
THIS END OF
LEAF
LEVER
RIDES
IN CAM
GROOVE
IN
MAIN
DRIVE
COLUMN
FIGURE
35
As
the moin
drive
column
turns,
it drives
the leof
lever
first
up
(to
open
the blodes),
ond
then
down.(to
close
the blodes).
But
the
moin
drive
column
turnsonly
in
onedirection--
cor.lnterclockwise,
os
seen
from the
top
of the
comero.
Different
instontoneous
speeds
ore obtoined
by
retording
the
moin
drive
column's
rototion
when the blodes
reoch
the
full-open
position.
Locqte
the
speeds escopement
which is
riveted to
the
comerq body,
Fig.
36. Once
the moin
drive
column
hos turned
for enough'to
op-en
the blodes,
its
RETARD
DRIVING
LUG
(the
some
lug-which
hooks the moinspring)
strikes
the
pin on the
first
29