Patent ID: 7275567

Claim:
A reinforcing bar binding machine comprising: a binding wire feeding mechanism, including a feeding motor for feeding out a binding wire, for feeding the binding wire to form a loop around reinforcing bars; a clamping mechanism for clamping a front end of the binding wire; a current detecting circuit for measuring a value of a current for driving the feeding motor; and a control portion for controlling the feeding motor; wherein the binding wire feeding mechanism is driven and reversely rotated for pulling back the binding wire and for winding the binding wire around the reinforcing bars, and the clamping mechanism is driven and rotated for twisting the binding wire and for binding the reinforcing bar, wherein the current detecting circuit measures the value of the current for driving the feeding motor successively at each unit time in a step of pulling back the binding wire; and wherein the control portion stops the feeding motor when a newest value of the drive current is increased by a predetermined amount from a lowest value of the drive current measured in the step of pulling back the binding wire.