If there is a pressure regulator on the upper left, top of the machine with an outer ring around the presser rod, here is what the manual says for Kenmore: Push down the outer ring of the regulator. This will release pressure on the presser foot. To increase pressure, push down on the inner pin (rod), until suitable pressure is obtained. Insuficient pressure may cause poor feeding. If feed dog or pressure marks show on fabric, reduce he pressure. For ordinary sewing, the inner pin (rod) should be halfway down. When sewing several layers, or thick fabric, less pressure is needed. When sewing thin fabric, slightly firmer pressure may be needed. (from Kenmore model13550 manual. You should always consult the manual for your machine.
I totally recommend experimenting with 2 layers of the fabric you intend to sew until you find the pressure right for your fabric. It shouldn't take long and will give the best result.
You may prefer to get a stitch regulator, which will help feed fabric more evenly, as used in quilting. Three layers of the quilt sandwich will always require you to address foot pressure accordingly. That is why we practice before starting on a precise stitching project.
Last edited by DonnaMiller; 02-13-2016 at 02:46 PM.