December 7th, 2021, 08:59 PM
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#6 (permalink)
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Junior Member
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- Dec 2021
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Re: esp 9000 threading problems
Quote:
Originally Posted by aardvark7
Although there are slight variations from machine to machine, most trimmers work in a similar fashion.
Basically the machine will stop at a certain point in its cycle and a hook will slide out and grab the thread, pulling it a set distance. Then the knife underneath will cut the thread and the hook will retract further, pulling the thread from the cloth. The loose end is often just held in place by friction.
When sewing starts again the needle will start the first stitch as the picker moves and catches the thread as it passes over the front of the rotating hook. This causes the end of the thread to be pulled through the fabric to the underside and the picker moves out of the way to continue normal stitching.
For this not to work properly either the hook grabbing the thread from the top is missing the thread or is not pulling sufficient slack before cutting, so that as soon as the needle starts the pick up lever pulls the thread out. Or the bottom picker is not catching the thread so that it pulls the slack down, meaning the loose end is too short and comes back out.
If changing the parameters of your machine (which you would normally only change for different fabrics and needles) is not helping, then some aspect of the above needs resetting.
Check that the thread is being grabbed before cutting and that is pulls sufficient slack. Then watch the hook underneath to see if the picker is operating as it should.
If both these are working then I can only suggest a really bad tension issue or that your machine timing is badly out. By this I don't mean the hook/needle timing, which is easy to check and only affects stitch formation, but rather the main shaft angle coding and how it affects all the other actions such as pantograph movement, jump stitches and thread trim. You need to know exactly what you're doing if this needs resetting, otherwise you can cause serious damage.
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I know this is an old post but I found it very useful. My bobbin picker was bent and would not work properly. cleaned and oiled the parts now it's working fine. Thank you.
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