Member since 5/2/09
In reply to paulakiss
Date: 12/9/12 4:19 PM
Anytime you have your pressure foot jacked up and lifted all the way up by tall layers of fabric, and too tall and just as high as it lifts, and really as tall as when you lift the pressure foot up to remove your fabric, you then have zero top thread tension, on purpose. When you have no top thread tension, you just always get thread loopies on the bottom of the fabric. It pretty much has to be that way.
You should not be on purpose, with your hands, be moving the fabric, as in pulling it, with or against the feed dogs at all. The feed dogs should be able to be, moving the fabric through all by themselves, your hands are to just lightly guide it. Side to side instead. Not back to front at all.
It is true if you instead try to pull and tug the fabric through, with the force from your hands, and fighting your feed dogs, because the feed dogs cannot feed it through the machine by themselves, (as too much fabric/vinyl all in there), then when doing that, the needle can really get bent and deflected, and it can slam into your stitch plate. Not only does that break needles and put scratches and dings in the stitch plate, but also that might really be a forceful enough event to un-adjust your machine. Maybe the lst time it happens, maybe the 10th time it happens, or maybe the 100th time it happens, or maybe not at all, no way of really knowing in advance at all. Except for all those visual and audio clues you might be getting, while you are sewing along and doing something like that, that one of those things is about to or or might happen.
In that case it really might not even be able to make stitches anymore, until it got re-adjusted. Because if and when that happens and the needle goes down, it would not even be near enough to your hook, to even pick up a thread loop and make a stitch. Also it can also make the needle strike your bobbin case, and put scratches or holes in that, that the thread is going to get caught on, with each stitch it tries to make. So best to just avoid all those kind of, unpleasant sewing problems and things, by the way you choose to use something and sew.
I think that is what you were asking about in your your very first post on this thread maybe. As will it hurt the machine to sew the purse, out of that fabric? Patterns and fabrics don't/can't hurt or break machines, but people do occasionally. By their sewing technique and how they use something. Or just by not knowing when to stop sewing on something, if they are approching and exceeding the limits of a machine sometimes. So, if it's too thick to go through there, you can't sew on it, and if it's too thick to go through there, and you try to sew on it anyways, by pulling and tugging on the fabric instead because the machine can't do it, then yes, I guess you can/could break things or unadjust things.
So the loops you are getting on the back of the fabric, probably are because you have too much fabric, and too tall of fabric, in the machine. It does not mean you could not sew that particular purse at all, but might mean you can't sew it out of that fabric, just like all the directions in the pattern tell you to do, without having a problem or hurting your machine. But, since you are the operator of the machine, it's in your control. I'm sure that 30 layers of that vinyl if there really was that, would be a no go there. Even 30 layers of bed sheet fabric would be a whole lot- no one sews like that.
It's up to the operator of something to use good judgement when operating something. Good judgement would to not be using your hands to try and pull and tug fabric through a machine, when the feed dogs can't do it all by themselves. Also maybe to take fabric layers, out on a back porch or something, and just try to pound it down flatter with a hammer maybe. Also to use a plastic jean a ma jag or a piece of folded up cardboard as a jig for when you go over tall to thin places, to avoid skipped stitches probably. But probably the best judgement, would be if feed dogs can't carry the fabric through all by themselves, to just really stop what you are doing. You might be still able to sew though some too tall and thick places safely by just turning the fly wheel by hand and not even using the foot pedal at all too. It's most times kind of difficult to break or hurt a machine that way, most of the time. Not saying it could never be done though.
In case part of the loops on the back of the fabric problem is because needle sticking in the fabric, and or fabric sticking to the sewing machine bed, not all just because fabric is just too tall to sew over, it might help to put a piece of paper on top of feed dogs and under the plastic fabric and then another piece of paper on top of the fabric but under your pressure foot. And try to sew though the paper. You could always try that too. But then you got to rip the paper off afterwards and might even have to pick some out, with some tweezers.