What is the function of wheel and axle in the sewing machine?

In a sewing machine, the wheel and axle function as a mechanism to convert rotational motion into linear motion. The wheel, often referred to as the handwheel, allows the user to manually control the movement of the needle and feed mechanism. As the wheel turns, it drives the axle, which in turn moves the needle up and down and advances the fabric, facilitating the sewing process. This system enhances precision and control over the stitching operation.