Device and method for cutting textile and non-textile sheet materials

Method for cutting a textile or non-textile sheet material (51) along a specified cutting line (53), comprising:

• providing a device for cutting textile and non-textile sheet materials with a sewing machine having a turning device (9) with a pin (13) that can be mounted locked in rotation on a needle bar (5) of the sewing machine and can be set by the needle bar into an oscillating vertical motion, a cutting needle holder (16) supported on the pin (13) so that it can rotate about a rotational axis A, a cutting needle (23) with a cutting edge (25) connected locked in rotation with the cutting needle holder (16), and the cutting needle holder (16) can be moved to and is lockable at predetermined rotational angle positions,
• holding a piece of sheet material (51) in a hoop and moving it in a controlled manner by a controller in a plane underneath the needle bar (5) of the sewing machine,
• calculating sections (53a, 53b) of the cutting line (53) for each of the predetermined rotational angle positions of the cutting needle holder (16), so that the sections are to be cut with the corresponding cutting edge alignment,
• successively moving the cutting needle holder (16) into each of the rotational angle positions necessary for cutting the cutting line (53), and
• for each respective one of the rotational angle positions, cutting all of the sections (53a, 53b) of the cutting line (53) to be cut with the corresponding cutting edge alignment.