Automatic Fabric Sensor System (Automatic Presser Foot Pressure)
The thickness of the fabric is automatically detected and the presser foot pressure is automatically adjusted with an internal sensor while sewing, to insure that your fabric is fed smoothly. The fabric sensor system works continuously while sewing. This function is useful for sewing over thick seams (Sewing Heavyweight Fabrics), or quilting (Quilting with the Compact Digital Dual Feed Foot).
Touch 
, and then set [Automatic Fabric Sensor System] to on. (Sewing Settings)
- Presser foot pressure