Feed dogs feed from the bottom only. When sewing through two layers of fabric, it is possible that one layer will be fed at a slightly different rate than the other layer. Although your two layers can be perfectly lined up when you start your stitching, by the time you are at the end of the stitching line, the layers can be "off" (one shorter than the other). This is VERY frustrating. Therefore, two different solutions have been developed.

If you are lucky, your machine will have differential feed. This can be engaged or not engaged depending on what you are sewing. My Pfaff quilting machine has differential feed and it is truly wonderful. Both layers of fabric are fed at the same rate.

If your machine does not have differential feed, you can accomplish the same thing by using a walking foot. It is a special foot that attaches to your machine. A sales person familiar with your type of machine can help you select the right foot for your machine.

Presser feet hold down the fabric and help guide it through. They also serve various special functions. Examples of special feet are the rolled hem foot, which causes the fabric to roll, and the applique foot, which has an opening in the back to allow the bulk of the satin stitch to pass through. Other special feet that are commonly used include the zipper foot and buttonhole foot. Knowing what types are available, and when to use them, can make all the difference in the quality of your work. These special feet also take a lot of the frustration out of sewing.

Find out what type of feet are available for your machine. Special sewing functions can be performed using other specialty feet such as: applique foot, bias binder, pintuck feet, felling foot, cording foot, special hemmers and many more.