Reinforcing bar binding machine

摘要

A front end of a loop of a wire fed out to a nose ( 6 ) by a binding wire feeding mechanism ( 1 ) is pinched by a clamp plate ( 28 ) of a binding wire clamping apparatus ( 25 ) and the wire is pulled back by driving to rotate reversely a feeding motor ( 13 ) of the binding wire feeding mechanism ( 1 ). When the wire is brought into close contact with a reinforcing bar (S) and a load of the feeding motor is increased to thereby increase a drive current by a constant amount, a control apparatus stops the feeding motor. Thereafter, the binding wire clamping apparatus ( 25 ) is rotated to twist the binding wire to bind the reinforcing bar. Since the wire is pulled back and a length of the wire is automatically adjusted in accordance with a diameter of the reinforcing bar, a state of finishing to bind the reinforcing bar is made to be uniform and also an amount of consuming the wire is reduced.