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Posted by robb on August 15, 2009, 9:29 am
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> Mina Prefect had written this in response to
http://www.sewgirls.com/sewing/Help-with-a-Singer-Touch-and-Sew-630-chainstich-images-inc-42359-.htm
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> :
[trim]
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> The thread dogs are moving fine, but after the
> 4th stitch the mass of thread gathering under the plate keeps
it from
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> moving. From using the paper at the highest tension possible
(9), I could
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> keep the paper moving long enough to see what was going on. It
seems that
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> the first loop (and second loop and third loop) is (are) never
unhooking
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> before going to the next stitch so it's not so much a chain
stitch as a
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> bunch of links on one loop- if that analogy makes sense.
> Is this the point where I just give up on getting it to work
ever?
there are a few more minor things you can do before considering
major surgery/servicing.
I think you have hit the diagnosis right on top of the head.
The chainstitch loop forming piece is not releasing the chaining
loops and why not ?
Examine the chainstitch pieces for snags like rust/gunk/niks/etc.
and for proper function
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> Check the small tab with the hole on the small bar ("Loop
Retainer Bar") under the chainstitch plate. the small tab on that
bar should be very smooth / slippery with no rough or snaggy bits
on it.
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> Check the flat disc that sits in top of the bobbin case ,
check that it is smooth and the little pointy nib/fingers do not
have any rough spots rust or niks etc.
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> Check the "Loop Retainer Bar" under the chainstitch plate
for **easy** movement. Check that it will move a little to the
front and back very smoothly and easily. That little arm is
suppose to move forwards and backwards enough so that you see
just a tiny bit go past the flat edge of the needle plate. Also
it should be able to move almost to the edge of the needle hole
in the needle plate . And it should be slightly springy if you
lay the needle plate upside down flat on the table push down on
that small arm. Look to see if it is bent ?
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> There is something called a "pull-off finger" which is a
small metal loop that sits under the feed dogs. It moves ever so
slightly forward / backward and up/down as the feed dogs feed.
The loop on that piece needs to look as though it is not rubbing
or bumping the feed dogs nor the roatary hook.
My personal experience with T&S chainstitching has been that it
is very sensitive to tension and any thing in the path of the
thread (gunk/burs/rust/niks/bends/etc) that interferes with the
thread and tension throws the chanistitch off.
hope this helps some
robb
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