Stitch is uneven, not straight, and tension off on top and bottom
My Singer Simple overnight, literally, stopped stitching correctly. The stitch is slightly off center at the begining of each stitch. Then, it goes back to center when the needle goes down to finish the stitch. Also, the bottom thread can be seen coming up through the top as well as the top thread can be seen coming through the bottom. I have tried changing the tension, thread, bobbin, material, needle, everything!!! I am out of ideas!!!
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According to the manual, you should not need to adjust the bobbin tension (and I located other sites which stated the bobbin tension cannot be adjusted on this machine). Apparently, all the tension adjustment is accomplished through the upper thread::
"EN Thread Tension Upper thread tension Basic thread tension setting: "4". (1) To increase the tension, turn the dial to the next number up. To reduce the tension, turn the dial to the next number down. A. Normal thread tension for straight stitch sewing. B. Thread tension too loose for straight stitch sewing. Turn dial to higher number. C. Thread tension too tight for straight stitch sewing. Turn dial to lower number. D. Normal thread tension for zig zag and decorative sewing. Correct thread tension is when a small amount of the upper thread appears on the bottom side of fabric. Lower thread tension The bobbin tension has been set correctly at the factory, so you do not need to adjust it. Please note: - Proper tension setting is important for strong seams. - There is no single tension setting appropriate for all stitch functions, thread or fabric. - A balanced tension (identical stitches both top and bottom) is usually only desirable for straight stitch construction sewing. - 90% of all sewing will be between "3" and "5". - For zig zag and decorative sewing stitch functions, thread tension should generally be less than for straight stitch sewing. - For all decorative sewing you will always obtain a nicer stitch and less fabric puckering when the upper thread appears on the bottom side of your fabric. 1 A B C 22 D"
Doing further research, I found this statement on a machine review site:
"After reading reviews online from where I've bought my drop-in bobbin machines, I think many of the negative reviews are due to the bobbin thread coming up without laying across the bobbin. It can cause the stitches to look very sloppy and no amount of tension adjusting can fix the stitches."
There are several machine review sites wherein 4423 owners stated their disappointment in the 4423's performance. Some said the machine failed almost immediately and others said the machines developed problems when sewing heavy fabric.
first ,re thread the upper bobbin, check the needle to match the fabric and the lower bobbin thread should be the same like the upper thread. If it dose not work, clean the discs tension for the upper thread.
Check the threading and tension on the top thread. It is the one that affects the stitch on the bottom. It may be hung up somewhere if it's not threaded correctly or the tension might be too tight. Also double check the size of your needle and make sure it is correct for the type of fabric. Most likely it is the tension. Double check the tension by sewing a wide zig zag stitch and examining the top and under side to see if they look identical and not puckered or too loose.
There are tow places where the thread tension is adjusted.
One is bobbin. This is not routinely adjusted. Just once and it is good for long time. This is done by turning the only screw on bobbin by about 1/4 turn or so at a time. Try several settings until you find he best.
the other place is the conventionally on body of the machine.
Tension of bottom stitch or top stitch are very confusing words. meaning difft things to difft pple. All i can say is this. If u see bottom stitch run straight through loops of top thread. then either top tension is too loose or bottom too tight. and vise versa.
With top tension set to middle position adjust the bobbin to get correct stitch. Then later on all u need is to adjust only the top setting according to stitch and cloth
Hi, check that the thread tension knob makes only one rotation from 0 to 9 and stops at each ends, see that it moves in and out as you increase or decrease the tention, see that the small tension wire to the left of the knob is still in place, in any of these fail you need to replace/repair that assembly.
Try this to see if it helps:
Remove top thread.
ALWAYS RAISE the presser foot and rethread from the beginning.
Start the top tension set at the midway point and then adjust.
Check that the bobbin is threaded and installed correctly.