Throw out the bad bobbins so you don’t have the same problem again.Īs for the belt. A metal 15 class Singer bobbin works better than the plastic bobbins that come with the machine, but they can get bent. If it still jumps out, you’ve probably scrambled something. Try to run the machine with the bobbin case in, and no bobbin. Most of the time, when the bobbin case jumps out, it’s because of a defective bobbin. She's A Sewing Machine Mechanic Octoat 8:40 PM You can’t use anything but a Juki bobbin in those. Those Juki bobbins are very specific to their machine. If that’s not the problem, you could be using the wrong bobbin. Scroll down until you get to “How to Clean and Oil the Bobbin and Feed Dog Area On a Drop-in Bobbin System.” You can click on the picture to make it bigger. There’s a picture on my blog at this link. If the spring is bent, you can usually bend it back into shape. If you find a rough spot, you can polish it off with a very fine sandpaper (400 to 500 gritt). You can take the plastic bobbin case out and feel for rough spots, especially on the bump that hits the spring. With either problem, the machine makes a banging noise every time it makes a stitch, just as the thread is pulled through the gap between them. Sometimes the spring gets bent, and sometimes the plastic bobbin case gets a rough spot. On those drop-in bobbin machines, there’s a spring that the bobbin case bounces off of. She's A Sewing Machine Mechanic Jat 6:30 PM
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