There is one way out. Give the sewing m/c a thorough servicing job, Clear all the pieces of cloth/fabric/threads, etc Remove the bobbin and load afresh. Clear out the toothed sliders which pulls the cloth while stitching. the thread being used for stitching passes a sort of loop, the tension being controlled by how much the pressure the spring can exert such that depending on the material being stitched. Specially after stitching satin, which is tricky material to stitch in a sewing m/c since the cloth is slippery. Also clear sewing jam and the metal teeth like rack which pushes the cloth for the next stitch to start. This area if cleaned up properly and a little bit of oiling on the spring loader and the spindle assembly which moves up & down...............................sudeep
When I suggested cleaning, I assumed you would clean out the machinery underneath too. Well lift the sewing machine and it will open like a book cover since the sewing machine is attached to the bottom but with hinge joints enabling one to approach the main working parts. The hole through which the needle juts in, there is circular pice which looks like a propellor but off course its not. I forget what the name is but when the sewing machine is stitching this prop rotates clockwise-anticlockwise motion. If anything needs a proper cleaning it is the circular bit which swings in the above manner. Look for accumulation of lint, thread and clean it well. The bottom thread is mounted in its casing at the center of this prop.
Now anyhing which obstructs the rotation of the prop, will resut in bad stiching leaving small loops on the underside of the sticthed material, also might skip a few stitches and again join tge stitching. This rotation should be completely unhindered otherwise it will affect the quality of the stitching. One can also oil the points which holds or support movement of other parts of the machine. Unless this equipment on the underside of the sewing machine is cleaned and oiled you will continue to fase problems stitching any type of material. I hope this helps ............................sodeep
Its just a shot in the dark, but try to change the stitching gap or the size of the stitch. Try increasing/decreasing it and observe if there is a better result, then try to tinker with this adjuster till you get the stitch as you intended..........................sodeep
Now you will have to decrease the tension on the bobbin plus oil all the points where its got any kind of bearing or ending of the cam & spindles. The toothed rack can also be adjusted such that the cloth is pulled smoothly. Now that you've watched it in motion decrease the length of travel by adjusting the needle by appropriate number of turns the threaded spindle just next to the needle holder at the top. If stitching becomes easier by reducing/increasing the length of travel of the needle holder, by trial & error method. This is the critical part 'cos that will decide how much time it gets to finish one cycle will be made equal to the amount of thread released from the bobbin per stroke, thus decreasing the chance of leaving a loop while stitching. Hope this helps.........................................sodeep
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Please explain exactly what it is doing in detail.
Hello there, try using a smaller needle size for the satin cloth. Also try rethreading everything.
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Thanks for your tips. I have rethreaded everything already. I've changed the bobbin and changed the needle. The satin stitching I was referring to was a zig-zag stitch sewn close together to create a finished edge on applique. I'm pretty sure the top thread is too tight and that's what's causes the bobbin to "bounce" as it sews and what causes the tension problems. Any suggestions on how to adjust that (other than the tension knob)?
I have rethreaded the machine, changed the bobbin, changed the needle, even "flossed" the tension discs, nothing I do seems to make any difference. I would take it to a Service Technician but I live in Bolivia and that would mean a trip to North America. Any suggestions would be helpful.
I do have a service manual for my machine.
Does anyone have any suggestions that include a little more than just cleaning out all the little parts? I've done that a couple of times and I've tried adjusting the internal tension on the upper thread. Is there something that can be causing this problem in the bottom part of the machine?
Sorry to have reposted this. I looked everywhere for some way to answer your question. Anyway, with the new post, came different options. I've tried to be as specific as possible.
I have a Huskystar C10. It's an electronic Husqvarna machine. It is a new machine and was working very well before I brought it to Bolivia. While sewing a tight zig zag stitch, there was a thread jam-up. I gently eased everything out, cleaned up the threads etc, rethreaded everything and could not from that point on, get the machine to sew with proper tension. I have taken off the needle plate at the bottom, removed the bobbin case, cleaned everything out (lint etc.) I have changed the needle, twice and I have used dental floss on the tension discs to be sure that there was no fuzz or lint. My mother was able to get me the service manual and I have taken the front panel off of the machine to try to adjust the upper thread tension knob on the inside of the machine. I will try to describe exactly what it is still doing. The machine will sew a couple of stiches correctly and then the top thread somehow catches on the bobbin, as the needle goes up. (Sometimes the thread is so tight that it stops the needle from going up.) The bobbin bounces in the bobbin case and the result is a loop of the top thread on the underside of the fabric. As I watch the top thread run over the bobbin case it seems to get really tight and then grab the front part of the bobbin case. This, of course, messes up the stitch and causes the tension problems, but I have no idea how to fix it. I assumed that it was a problem with the upper thread tension. I have not adjusted anything else on the machine although I have read in the manual how to adjust the bobbin tension. At this point, the only thing that I have changed is the upper tension. I hope that this explains the problem a little more clearly. I don't have the option of taking it to a technician since we are in South America. Thanks for taking the time to try to figure this out
I've posted the details, hope you can come up with some ideas.
Thanks.
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