What is the primary purpose of a sewing machine's feed dogs?

The primary purpose of a sewing machine's feed dogs is to move the fabric during stitching. Feed dogs are small, metal teeth located under the presser foot that grip the fabric and advance it in a controlled manner as the sewing machine stitches. This movement allows the fabric to pass through the machine in sync with the needle's actions, enabling the creation of consistent, straight stitches or patterns.

Understanding the role of feed dogs is essential for effective sewing; they facilitate precise control over the fabric's position, especially when working with varying thicknesses or materials. This element of design is crucial for achieving professional results in sewing projects. Other components of the sewing machine, such as the needle and presser foot, perform different functions, but the feed dogs are specifically engineered to ensure the fabric moves smoothly as you sew.