[amayausers] Re: Thread Break and Machine Jump
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- To: amayausers@xxxxxxxxxxxxx
- Date: Mon, 16 Apr 2007 14:39:36 UT
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Jim,
The answer to your fundamental question, "why does the thread cut or break
right before it gets to the needle (maybe 2-4 inches up from the needle)?", is
this.
Discounting the possibility that there is acually a defect in that section of
the tread, the number one cause is found in the needle area.
In training some time ago, it was pointed out that at approximately 1200spm,
any given piece of thread from the cone to the needle, will then pass back and
forth through the needle approximately 40 times before it is actually laid down
on the garment!!!! This would apply to a normal length stitch.
Think about this. The Amaya feeds thread to the take-up levers by a computer
controlled procedure. The needle bar and needle will then pull this slack
thread down through the garment and pick up the bobbin thread. The take-up
lever will then take up the slack, pulling the thread back up through the
material and through the needle until the thread is pulled tightly at the upper
top of the take-up levers stroke. The motion is then repeated, rubbing the
thread back and forth through the entire thread path.
If the is a burr on the needle, think of how many chances this burr has to
"snag" the thread as it pushes and pulls the thread back and forth through the
fabric! A burr inside the needle eye, a needle that is turned to the left or
too far to the right or is bent, a rotary hook that is not timed properly, a
burr or roughness on any part of the thread path from the cone to the garment
OR the garment fabric it self. Dry thread, old thread, brand of thread, needle
shape and size, dense designs or narrow columns as in small lettering are nasty
little culprits too. Pushing thread back and forth through butter is a lot
easier than trying to push it back and forth through sandpaper..
Hope this gives you some insight on the fundamental question of "why". This
does not cover all the possibilities, but should give you some things to think
about.
Rod Springer
Melco Tech & Trainer
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