Sewing machine, with a differential fabric advance, has a control to set the upper and lower fabric advance mechanisms to move both fabrics together or the upper fabric at a higher speed

摘要

The sewing machine (1), with a differential fabric advance mechanism, has a control to set the upper (3) and lower (4) fabric advance units with upper (110) and lower (120) belts. In one setting, the units move two layers of fabric together on the needle plate (2) and, in another setting, the upper fabric is moved at a different speed from the lower fabric with each stitch.