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Fool proof system
In connection with the wind up systern which
reciprocates,
a release
stopper
plate (Fig. 2-1) is employed to prevent
an improper
pushing
of
the shutter button ;
You can push the shutter button only when
the wind
lever returns to its original position.
Otherwise, the exposure is bound
to be a failure.
2-direction wind lever ratchet
is also employed
to prevent the back-
ward movement
of the lever and shutter mechanism
when the finger is
off the wind lever on its way to the fully cocked point.
The pawl changes
its direction,
as illustrated,
when it reaches
the cut out sections
located
on the both ends of the teeth on the lever ratchet wheel
which moves
with
the wind lever.
The shutter being cocked,
duality prevention keeps the pawl in the
same
direction by which the rapid wind lever is locked,
thereby preventing
a double wind up.
SELECTOR
GEAR
DUALITY
PREVENTION
LEVER
end
DIRECTION OF
ROTATION WHEN
WIND LEVER IS
WOUND.
Pig.2-6
Film transport
Roll film in the fed spool is transported by the take up spool.
Film
length to be transported for each exposure
is sensored
by the counter
roller driven by the film through friction between them.
The counter
roller advances
the exposure
counter
dial and the transport
control wh-
eels (toothed wheels).
A certain number of the rotation of the counter
roller due to the proper film transport,
advances
one pitch of the trans-
port control wheel,
and the lip of the spool stopper engages the space
of the control wheel.
Then the spool stopper turns
off the film take up
rotation of the take up spool at the friction shaft system mentioned
later.
1-PITCH
OF TRANSPORT
CONTROL WHEEL
TAKE UP SPOOL
Pig.
2-7
FILM
Kp
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