The pneumatic and electric controller for reed back airflow detector includes one reed, one main nozzle and one auxiliary nozzle. The reed includes several parallel reed blades with notch, and the notch combination forms the wefting slot in the front side of the reed. The main nozzle is parallel to the wefting slot, and the exit of the auxiliary nozzle is opposite to the wefting slot. The auxiliary nozzle is fixed on the detector seat, and so does the sensor frame. The airflow sensor installed on the sensor frame is located in the back of the reed. The auxiliary nozzle is connected through pipeline to the high speed responding valve and the cut-off valve, and the signal receiving end of the airflow sensor and the controlling end of the high -speed responding valve are connected electrically to the main control board separately. The pneumatic and electric controller is used to set technological parameters and to detect the back airflow after technological parameter change. |