Singer curvy I've had my machine for over a year and I just recently noticed that the decorative stitches aren't working. The basic straight stitch works fine and tension is good, but any of the decorative stitches just sew straight.

SOURCE: Husqvarna Prisma 980 decorative stitch cassettes don't work

Hi,
On that machine, the cassettes aren't actually computer chips. Each cassette has a little spot of white on a certain little area you must find (top right I'm pretty sure). Look in the machine at that point. There is a sensor that looks for that white spot, and as it identifies it, it changes stitches according to that cassette. Either the sensor is blocked, gone bad, or you can put a fresh coat of white paint on with white out. I hope this helps.
Kent

SOURCE: Singer Touch Tronic 2001 Sewing Machine Stuck on Sewing Straight Stitch Only

I had a similar problem a couple of years ago. I finally figured out that I had the straight stitch needle plate (the one with the single hole), rather than the zig zag needle plate (the one with the curved hole). When I changed plates, it worked fine.

SOURCE: i have singer 1725 sewing

Hi, you can download the manual free at this address. http://www.singerco.com/uploads/download/691_1725.pdf
Happy Sewing!

SOURCE: I have a Sapphire 835,and

Hi

Loops on the bottom of the fabric = inadequate top tension
Loops on top of the fabric = inadequate bottom tension. this is probably a tension problem. there is a discrepancy between top and bobbin thread tension. The looping is a too loose tension in the bobbin or too tight a tension on the top thread. in either case, and regardless of cause, the two are out of synch. Try adjusting bobbin tension according to your machine type. after adjusting the bobbin tension sew on a piece of scrap. use a medium sized stitch. check and adjust and test until you are satisfied. If the looping isn't severe, adjust top string tension slightly looser.

Here are other causes for this problem, but they are more unusual and should be considered only if the common remedies don't answer.

If it's the bottom thread, the bobbin isn't wound or loaded correctly, or it's the wrong bobbin. Check to see the bobbin fits in the bobbin case properly. Don't mess with the bobbin tension unless you have to. If the machine had been working before and is not now, the problem is most likely not in the bobbin tension. The adjustment range is really tiny, and it's easy to mess it up.If it still loops after you redo the bobbin, you might also check the parts around the bobbin. Clean up all the fuzz that had collected around the bobbin. Remove all fragments of thread and fuzz with brush and vacuum (don't use compressed air or canned air or blow -- it pushes fuzz farther into the machine where you can't get to it.) Pay special attention to the area around the feed dogs and the sewing hook area.
Lubricate the machine according to the manual's instructions if the manual describes using oil.

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SOURCE: kenmore 100 stitch machine will not form stitches

it's probably time for the machine to be serviced