Flat seaming machine band air current pulls and fixed -length cut device

The utility model relates to a flat seaming machine band air current pulls and fixed -length cut device, including air current drive mechanism and fixed -length cut mechanism, fixed -length cut mechanism include fixed plate, cylinder, deflector and cutter the fixed plate on open and to have the opening that can supply the band to pass, the cylinder is fixed on the fixed plate, the fixed plate is hugged closely to the piston rod of the cylinder's that the cutter linked firmly lower tip, is in the open -ended top during cutter initial condition simultaneously, the up -and -down motion can be realized with the deflector cooperation to the cutter, the air current draw including the ventilation pipe, the entry end of ventilation pipe lies in the rear side of flat seaming machine stitch, the exit end communicates with each other with the opening of fixed plate, the position that is close to the entry end at the ventilation pipe top is provided with the blowing nozzle, the blowing nozzle passes through trachea and a