Needle plate, foot and feed dog of a sewing machine.
Feed dogs are the feeder mechanism in a sewing machines which is typically used to pull fabric through a sewing mechanism.
A set of feed dogs typically resembles two or three short, thin metal bars, crosscut with diagonal furrows, which move back and forth in grooves slightly larger than the bars. The type of motion used (forward, then down, then backwards, then up) serves to pull the fabric through, since the "dogs" are in contact with the material on the forward stroke, and are pulled down below the main plate on the backward stroke by the sewing machine's mechanism. The result is that, between stitches, the fabric is pulled along in discrete steps.
Most sewing machines using feed dogs can pull fabric forwards or backwards at various stitch lengths; this is typically controlled by a stitch lever on the front of the machine.
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