Is this normal?
Hope I can explain this clearly enough so you can visualize. I noticed while sewing yesterday at a medium speed that the fabric slightly jumps up and down as it approaches the sewing machine needle. It has probably always been this way, but wonder if I need to change needles or the tension. Shouldn't the fabric just calmly and smoothly run along? I have a 3 yr. old Janome 6600. THX