Argus C3 - OPERATION OF THE ARGUS C-3 SHUTTER

BELL
CRANK
SPRING
LOWER
END
OF
RELEASE
PLUNGER
RETARD
LEVER
WIRE
LINK
FIGURE
11
SHUTTER COCKED
direction. The
shuttlecock ossembly,
during
its releose trovel,
contocts o lug on the
blode
operoting ring to open the shutier
blodes
--
you'll
be
oble tosee the oction of theshuttlecockmore
cleorly ofter
we remove the
shutter
blode
ossembly. A spring on
the
blode
operoting
ring, not yet visible, then closes the
shutter
blodes.
Since you've removed the front
plote
--
ond, olong with
it,
the speed comond the com
follower--the shutternowdeliversthe
fostest
speed
(lrl300
second). The
reoson
is
thqt the
bell
cronk
spring, Fig.
ll, holdsthebell cronkoll thewoy inthe
counterclockwise
direction
.
Setting slower shutter
speeds pushes
the
bell
cronk
in
o
clockwise
direction
--
the
speed com pushes
the
com follower
down,
ond the
com follower in turn rototes the
bell
cronk
.
Notice
in
figure ll
thot
o long
WIRE
LINK connects
the bell
cronk fo the RETARD LEVER in the
speeds
escopement.
ln its
present position
--
V\OO
second
--
the retord
lever
holds the
first
geor
segmenf
(in
the speeds escopement)owoy from'
the lobeot the bottomof
the
moin
lever.
But
os youselecf slower
speeds, the bell
cronk
pulls
the retord lever owoy
from the
first
geor
segmenf
. The
first
geor
segment then turns clockwise,
under iis own
spring
tension,
os simuloted in
figure 12
--
now,
the
pin
(on
the
first
geor
segment)
is
in the
position
to intercept
the lobe
(on
the moin
lever)
during
the releose cycle.
So
the
posifion
of the bell cronk determines
the
position
of the retord. lever
--
ond the
retord
lever decides
how for the
9