Binding machine for reinforcing bars

The invention refers to a binding machine for reinforcing bars (a) comprising a binding machine body (105), a bending guide arm (101) arranged at an end of said binding machine body (105), a feed adjustment mechanism (103) and a twisting mechanism (107), wherein a binding wire (b) is sent outside reinforcing bars (a) from said bending guide arm (101) and is formed into a loop, and then a portion of the loop is twisted by said twisting mechanism (107) so as to bind the reinforcing bars (a), wherein said feed adjustment mechanism (103) adjusts a feed of the binding wire (b) according to one of a diameter of the reinforcing bars (a) and a diameter of the loop of the binding wire (b) wound round the reinforcing bars (a), and said feed adjustment mechanism (103) comprises a motor (110), a first feed gear (108) rotated by said motor (110), a second feed gear (109) engageable with said first feed gear (108), a link (111) connected to said second feed gear (109), an electromagnet (112), wherein said second feed gear (109) is engaged with said first feed gear (108) in order to feed the binding wire (b) when said electromagnet (112) is not electrified, and wherein said second feed gear (109) is attracted by said electromagnet (112) via said link and disengaged with said first feed gear (108) in order to stop feeding the binding wire (b) when said electromagnet (112) is electrified.