BOBBIN WINDER DEVICE OF A SEWING MACHINE AND METHOD FOR CONTROLLING OR REGULATING THE SPEED OF THE MOTOR OF A BOBBIN WINDER DEVICE

A bobbin winder device of a sewing machine includes a motor (1), which is controlled by a motor controller (21), in order to drive a spindle (7), to which a thread bobbin (9) can be attached in order to wind on sewing thread. A brake device (3) with a brake pad (11), which brakes the bobbin arrangement when the winding radius of the wound sewing thread is greater than a predetermined reference value (C0), is arranged next to the spindle (7). The motor controller (21) monitors at least one measured variable, which is dependent on the load on the motor (1), in the driving circuit of the motor (1). If this measured variable or the rate of change thereof changes such that it falls below or exceeds an associated stored comparison value, the motor controller (21) causes the motor (1) to be shut down.