The Intelligent Feed System (SFS-i), is the latest evolution of the Janome Superior Feed System +.
The Superior Feed System + features a 7 piece feed dog that moves in a box feed motion, as opposed to the traditional elliptical motion. This means that when the feed teeth come up from below the needle plate they all come up at the same time, gripping the fabric from below and moving the fabric evenly. At the end of the movement all of the feed teeth drop at the same time, ensuring that there is no fabric movement when the needle is in the fabric. This style of movement, combined with Adjustable Foot Pressure, give the SFS + models strong and consistent fabric feeding capabilities.
On the Continental M7 Professional, a new feature has been added to the SFS-i, where the feed teeth will automatically lower when the foot is raised, and the feed teeth will then raise again once the machine begins sewing. This is especially handy when sewing with bulky fabric, overlocked fabric, stretch fabric, t-shirt fabric and fabric with a looped pile, as the fabric can easily be placed before sewing and removed at the end of sewing without any risk of the feed dogs catching on the fabric.