Device for preventing of wire breakage during twisting in a wire bundle gripper for reinforcing bars

摘要

A method of preventing a wire from being twisted off in a reinforcing bar fastening machine having a wire pay-off device for paying off a wire (1) for fastening reinforcing bars (b), a guide arm (3) for guiding the wire (1) so as to wind around a crossing point of the reinforcing bars (b) in the form of a loop, a twisting device (4) for performing a tying operation by twisting while picking up part of the loop of the wire (b) wound around the crossing point of the reinforcing bars (b), and a cutting device (5) for cutting the loop from the wire (1) on a reinforcing bar fastening machine side, the method comprises the steps of: monitoring a torque of a motor (6) for driving the twisting device from an operation start timing of the twisting device (4); and bringing the tying operation by twisting performed by the twisting device (4) to an end upon detection of a peak of the torque. IMAGE