My Bernina activa 140 will not sew the blind hem stitch. After 3 or 4 stitches, the thread gets tangled and the machine won't sew. I have to cut the thread and pull multiple threads out of the feed dogs. I have checked and rechecked to make sure the machine is threaded correctly, the thread is installed in the bobbin case correctly and the bobbin case is inserted correctly. I only have this problem with the blind hem stitch.
Are you absolutley sure you're not getting a problem with stitch formation on, for example, wide zig-zag. Check again, using a different colour top and bottom and make sure that the stitch is being formed properly with only the top colour on top and bottom colour on the bottom. It sounds as though the bottom loop is not being picked-up by the hook properly. Make sure you've thoroughly cleaned-out any fluff under the stitch-plate and remove the hook/shuttle and give the hook race a good clean and give it a single drop of oil, even if you've got the lightweight part-plastic hook/shuttle fitted.
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