Why does the bobbin cover fall off each time I either move the fabric or if the fabric is thick? It rides up and down. Should it be secured into the lot?
Yes, it should be secure, check to see if the bobbin is warped
try a different bobbin,
the bobbin cover may need to be replaced, & even the bobbin hook
& hook race may need to be checked to see if they are damaged
SOURCE: Needle & Bobbin out of sync
This description sounds like the machine is out of time. The needle should match up with a cut out section in the bottom of the bobbin area. If it is hitting, the timing has slipped, probably from sewing on a fabric that was too heavy for the machine.
SOURCE: Fabric doesn't Feed
It sounds like your feeddogs are still down in the embroidery mode. It should be a button on the right side of the machine. they have to be up for sewing and down for embroidery.
SOURCE: fabric pulls down into bobbin area
Increase your top tension, from 2 to 4, or from 5 to 6. Also check if there is no fluff or cotton in the top tension blades, preventing them from closing properly. Do this by lifting the presser foot and decrease the top tension to zero. This open the blades and allows you to inspect them. Good luck!
SOURCE: Sewing machine not stitching
Sounds like you need to retime the machine, if you email me I can attach instructions [email protected]
SOURCE: My machine had been working
Most machinary is built with some adjustment feature and I see that you have thoroughly checked for loose,missing or broken parts, so that leaves only the adjustment left.
Examine the mechanism to see how the feed dogs operate and try to find the adjustment.
It sounds as if the dogs have moved down and you need to release a clamping screw to raise it a little and re-tighten the screw.
While you are inside, check for any slop in the fittings before attempting any adjustment.
as you can see when thread was pulled out from bobbins winder is moving counter clockwise.If you try to sew, try cotton fabric and set dial to # 3 to 4 and stitch set range to 8 up to 12 depend on layers and thickness,After setting try to sew manually ,turn hand wheel by your hand first,let upper tension catch the lower bobbins tension and arranged thread and insert fabric use hand turning hand wheel several time until stich appear on fabric observed loop thread on lower bobbins on fabric.if accumulation of loop thread on lower adjust upper tension also dial tension gradually until it has a smooth stich appear.
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