Abstract: A rebar tying machine wire feeding disc braking mechanism with positioning device has a braking part for stopping a wire feeding disc and a cam mechanism for controlling actions of the braking part. The cam mechanism has a cam and a push shaft mounted on a fixed seat, capable of axial displacement. One end of the push shaft presses against a rim of the cam and reciprocates along with the changing outline of the rim. A middle portion of the push shaft is a diameter-varying segment and presses against one end of the braking part such that the braking part swings forwards and backwards with the translation of the push shaft, the cam mechanism realizes stopping through the positioning device. The forward rotation inertia of the cam is eliminated such that the cam is stopped.

Abstract: A rebar tying machine comprising a tying machine main body (1) and a steel wire winding assembly (2) mounted in the main body, a steel wire cutting off mechanism (3) is further mounted in the main body and comprises a transmission device (31) and a wire discharging block (32), the steel wire winding assembly comprises a winding mechanism (21), a driving device (22) for driving the winding mechanism and a locking device for locking the winding mechanism, an advance/retreat locating slot (211) and a rotating cam slot which are communicated with each other are arranged on the winding mechanism, an anti-rotation fixing pin (231) in the locking device moves axially in the advance/retreat locating slot, and the anti-rotation fixed pin slides in the rotating cam slot along the circumferential direction.