David Farber wrote in message
...
N_Cook wrote:
David Farber wrote in message
...
I don't know much about sewing machines but this does not seem like a
complicated problem.Here are the pictures of the problem:



http://webpages.charter.net/mrfixite.../CS-80-bobbin-
winder.jpg


http://webpages.charter.net/mrfixite.../CS-80-bobbin-
winder-2.jpg


http://webpages.charter.net/mrfixite.../CS-80-bobbin-
winder-3.jpg

The symptom is when you maually engage the bobbin winder assembly on
the top of the machine and press the button to activate it, you can
hear the motor turning inside but the winder does not turn. The
first two photos show the faulty drive assembly removed from the
machine. The last photo shows the assembly loosely installed in the
machine. There is some mysterious black slime (could it just be
lubricant?) which I thought must have been some kind of belt or
idler that started disintegrating from age but the machine is only
about 5 years old. The main belts are in very good condition so it
doesn't make sense to me how this could have happened. If you poke
the slime with a small screwdriver it doesn't make a really big mess
on everything it touches like an old rubber belt does. You can see
in the third picture that the area surrounding the part is fairly
clean. I think that small black mark on the large gear to the left
happened when I removed the part. By the way, the part in question
is mounted on a plate that can be manually shifted up against the
main gear assembly to get it to turn. I searched around for a parts
diagram for this model but no luck. I know some of you that frequent
this board have delved into sewing machine repairs and was wondering
what this part is and how it interfaces with the drive mechanism to
make the winder rotate.

Thanks for your reply.
--

David Farber
Los Osos, CA



I've never sen te like of that, gooey rubber plenty of times.
So all that model will go the same way. Presumably the result of
over-plasticised plastic rather than a rubber formulation as you say
it is non tacky. Whenever that happens with rubber then there seems
to be a contagion that affects all the rubber bands in a piece of
kit, perhaps not the case with what you have there
I would get some small neoprene O rings and stretch 2 or 3 over the
pulley to take up the width , if not enough diameter then 1 or 2 more
stretched over that underlying layer.
Then perhaps look out for a proper replacement

I may have to resort to a home made repair as you suggested if the $4 tire
I
bought isn't a good fit.

Thanks for your reply.
--

David Farber
Los Osos, CA



And is the "proper" replacement going to be plastic also?
If you burn a bit of the gooed original is it a rubber or plastic smell?