What do you mean by top & bottom sprockets? Between the film plane opening
and the take-up spool there is the sprocket shaft, one sprocket, turning as
one, to pull the film. The metal inner shaft disengages from the outer
plastic part to allow film to be rewound, when you've finished the roll.
When you wind the shutter for the first time when loading a fresh roll, the
metal interior part snaps back into position and the sprocket turns. If the
clutch on the take-up spool is bad, film will slip on the sprockets (you'll
hear it clicking) and frames will overlap.
Note for OM-PC users, I'm seeing more and more PCs where the rewind button
won't come up anymore because part of the inner sprocket shaft (the spring
loaded part that takes all the stress) is made of plastic and it BREAKS! Of
course the PC sprocket is NLA so the nearest fit that will atleast allow you
to use the camera, is the sprocket from the 2S (they are all different).
Only problem with using the 2S sprocket is you have to hold the rewind
button down manually during film rewind. Atleast you can use the camera!
_________________________________
John Hermanson www.zuiko.com
Camtech, Olympus Sales & Service since 1977
21 South Lane, Huntington NY 11743-4714
631-424-2121 For Free Olympus manuals,
please call 1-800-221-3000
_________________________________
----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Wednesday, April 16, 2003 5:47 PM
Subject: Re: [OM] Aaaargh - I did it...
> I just put a roll of junk film in an OM-4 and tried it. The upper and
> lower sprockets both drive the film and appear to be locked together.
> The take-up spool also rotates with them, but does have a clutch, as it
> must. The clutch is needed since the diameter of the film spooled on it
> varies over the length of the roll. If the lower sprocket is not driving
> the film, you have a problem. You might want to check the rewind button.
> It should pop right back up as soon as the shutter is wound for the
> first shot after it is pushed down. When it is down, the wind mechanism
> is disconnected from the drive sprockets so the film can be rewound. If
> it has had something sticky fall on it, been hit and bent, or some such,
> and doesn't pop back up, the film won't advance.
>
> Moose
>
> Jez.Cunningham@xxxxxxxxxx wrote:
>
> >As suspected it hadn't been winding. Boo-hoo! The leader was in the
> >take-up spool OK, but the film was not advanced far enough to get the top
> >sprockets into engagement (only the bottom sprockets).
> >
> > Question to experts: Is it only the top sprockets that do the pulling
> > through the camera? Do the bottom sprockets and take-up reel do
nothing
> > or is there a clutch that is slipping too much in my camera? (3 years
> > since last CLA)
> >
>
>
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