Strand coiling length fixing device for bobbin winder

A strand silk coiling and length setting device for winding machines belongs to the measurement technical field, for resolving the coiling and length setting problems of strand silk. The technical scheme comprises a length measuring wheel, a photoelectric sensor, a preset counter and an electromagnet, wherein the length measuring wheel via a rotation shaft is provided on the route of strand silks, the photoelectric sensor is fixed beside the length measuring wheel, whose pulse signal output is connected with the pulse signal input of the preset counter, the normal open contact of the preset counter is serially connected in the power supply circuit of the electromagnet, the armature of the electromagnet is connected with a park switch rod via a park draw rod. The utility model has simple structure and low cost and can accurately control the length of strand silks.