PROCEDIMENTO PER UNITE MATASSE DIMATERIALE

A method of knotting with a clamp adjacent an axis and a two-jaw knotting head rotatable about the axis comprises the steps of first wrapping a strand around an object to be trussed with the strand ends together and gripping and retaining the strand ends together in the clamp with one of the strand end portions passing under the jaws of the knotting head and then upward to the object, the other strand end portion passing over the knotting head between the one end portion and the axis and then downward to the object, and the strand end portions crossing between the knotting head and the object being trussed. Then the knotting head is rotated through less than one full revolution with the jaws closed together to bring the crossing point of the strands onto the jaws and loop the one end portion around the jaws. The jaws are then opened and the head rotated through the balance of the revolution to engage both end portions between the jaws between the clamp and the axis. Thereupon the jaws are closed and the strand end portions that are looped together are pulled off the ends of the jaws to knot the strand end portions together.