Minolta 7000 - Page 9

(3) Aperture control mechanism
r—— Disengaged by M,
' forward running
Aperture stop gear-—-----~""
Slit plate —-~
Backlash
absorption
SP
3%
T—.
Charge
gear
8
Ring gear roller
Aperture ring return SP
~~ Aperture ring return gear
70: Backlash absorption spring, always pushing
aperture-contro]-base-plate gears towards
Aperture
ring
full-opening
side,
eliminates
backlash
and
prevents error of aperture encoder (See
p. 20).
WOperation when stop-down
Mi, starts sreteeesanrenees With charge gear B engaging with mirror-box gears, shutter-release activation
rumning (reverse} starts
For full-opening setting, SLs separates, and aperture-stop-gear locks by stop-
magnet-lever, (no activation of aperture ring)
Stop-down
opus
Rotating,
aperture-ring-return-gear
charges
aperture-ring-return-spring
—
Ring-
activation
starts
gear-roller
rotates
by
sub-spring
—~
Aperture
ring
rotates
in
the
direction
of
}
stop-down
+
Aperture-control-gear
rotates.
| slit plate rotates, generating aperture pulse |
Aperture
pulse
to...
Pulse
is
counted,
corresponding
to
amount
of
setting
aperture
from
full-
a
opening.
1
stop
=
8
pulse
Aperture-ring
|...
eeaee
reer
aeses
SLs
separates
—+
Stop-magnet-lever
stops
aperture-stop-gear
—+
Aperture
ring
stop
1
stops.
(Aperture-ring-return-gear
continues
rotation.)
Completion
of
stop-down
MOperation when resetting to full-opening
M, starts running
(forward) Charge gear B is disengaged — Mirror-box gears idle.
Tsu
charge
|
ponte
enceseaveneeeees
Almost
the
same
time
that
mirror
box
gears
become
idje,SL;
is
charged
by
aperture-return-lever
on
winding-base-plate
side.
and
aperture-stop-gear
is
. disengaged.
Aperture ring
relun
oo)
PU
Forced
by
aperture-ring-return-spr
ing,
aperture-ring-return-gear
rotates,
pushing aperture-contral-gear.
Full-opening (Aperture ring is returned to stop position)