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2-13
2-2
SHUTTER
SYSTEM
General
Except for the shutter
curtains,
most
parts of the shutter
system
locate on the wind lever side of the mirror housing,
and use of two
spiral springdone
for mirror
flip up and the other for shutter
restoring)
is a feature unlike
the other types of Pentax.
External
apperance
is
shown in Fig. 2-15.
Shutter
curtains
The shutter
curtain
system
mainly
consists
of the rubberized
silk
curtains with plastic curtain tapes, selector
gears,
checker
levers and
tension pipes,
as illustrated
in Fig. 2-16.
Shutter
curtain traveling is transmitted
to the selector
gears by the
curtain pinion gears,
but the system
itself does not have a traveling
stop-
per:-
original and fully wound
up positions
of the shutter
curtains
are
provided by the bounce
prevention
system
and wind up system
(film tra-
nsport system) respectively.
Shutter
cocking
The
shutter
is cocked
by the wind lever through the main
gear,
mir-
ror charge
gears and curtain charge
gear,
as shown
in Fig.2-17.
The main gear
engages
with the wind lever
shaft through the claw clutch
which can switch the shutter
system
to operational'
or"non-operational"',
After
cocking the shutter,
the spring tension and torque are
checked
by hooks
and checker
levers.
Shutter
operation
Operation which follows after the shutter
release
is:-
Refer to Fig. 2-18.
1
Power
SW turns
''on",
diaphragm
checker
hook disengages.
(Cur-
rent
starts flowing through the electromagnet,
lens aperture diaphr-
agm is closed down)
2
With the disengagement
of the mirror
hook,
the mirror
actuator
disk rotates
together with the mirror
coupler cam. (Mirror flips up)
3
Second curtain actuator maintains
its position by the magnetic
attraction
from the electromagnet,
even after
the mechanical
sustaining force
terminates.
4
With the timing
checker
lever disengages
the timing
cam
starts
rotating.
5
Timing SW "off"
6
lst curtain starts traveling.
7
With operation
of the "electronic
circuit'
the magnetic
attraction
from
the electromagnet
terminates.
The 2nd curtain actuator
jumps
up releasing
the 2nd curtain.
The 2nd curtain
starts traveling.
8
Completing
the exposure
on the picture frame,
the 2nd curtain
sele-
ctor gear disengages
the re-set: hook through the re-set
intermediate
lever and the re-set actuator,
I
9
With the restoration
of the spiral spring,
the gear train,
mirror
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