Chris Charlton wrote:
>
> Hi,
> Thanks for the tip, the cam you mention, is it the one
> that operates the main lever (across the underneath of
> the camera)? I've noticed that it rotates when I
> advance the lever, is there anyway to detect whether
> or not it hasd come away from the curtain gears? When
> you say it breaks loose, how is it held in place
> normally? (screw, thread, glue, interference, etc?)
> Did you use epoxy to glue the shutter cam?
The cam & gear I'm referring to is d-e-e-e-p inside the shutter --
you've got to remove the front casting (main circuit/prism/eyepiece/lens
mount, etc.) to even see it. I believe it's welded to the underside of
one of (what I call) the curtain wind gears. On the few I've fixed
(it's virtually impossible to reassemble the shutters -- too many ball
bearings!), I've super-glued, then JB'd them v-e-e-e-r-r-r-y carefully,
reaching into the shutter assembly with a toothpick after it's been
removed from the body. Never had one come back, but....
The part you're referring to I call the "winding cam stack" -- it's
turned by rotation of a shaft running through the center of the
sprocket. As it begins to turn, the top level of this cam stack catches
what I call the "transfer gear", then the second level of teeth continue
the rotation until the shutter has wound. At that point, there's a gap
in these teeth, and the "transfer gear" slips off and spins back under
spring tension to it's starting postion.
Another layer in the "cam stack" is latched by the silver levers by the
battery chamber (the ones I think you're pulling away to let the wind
turn) when the shutter is wound. These levers normally wouldn't be
pulled away until the shutter has been fired. This is to prevent double
exposures/skipping frames. And there's a cam that operates the big
lever across the bottom that tensions the mirror's spring. There's a
couple of other functions tied in as well -- as I've noted on other
postings, hardly anything in an OM just does _one_ thing! The more you
study them, the more you've got to be impressed with Mr. Maitani -- pure
genious!
Oh, yes -- the reason I use my own names for these parts is that the
factory name is virtually worthless in pratical use -- who can remember
what the "A Lever 2" is, for example! But if I say, "the mirror cocking
lever", I bet you can figure it out!
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