Typically the fabric feed and direction are effected by the height of feed dogs. Likely either the feed dogs are sticking(not dropping) or there is debris in the feed dog mechanism.
Try lowering and raising feed dogs and see if problem clears.
Clean the bobbin, hook, and feed dog area (vacuum out). Lubricate according to machine directions.
Answers & Comments
Typically the fabric feed and direction are effected by the height of feed dogs. Likely either the feed dogs are sticking(not dropping) or there is debris in the feed dog mechanism.
Try lowering and raising feed dogs and see if problem clears.
Clean the bobbin, hook, and feed dog area (vacuum out). Lubricate according to machine directions.