The motor-driven mechanical cam drives the pick needle to move back and forth on the warp threading machine, separating yarn. During the separation process, double yarn may occur due to sizing or yarn accumulation. At this point, a sensor matching the yarn tension detection sends a signal to the control system, stopping the equipment. The operator then manually clicks the equipment's empty warp button to initiate the empty warp treatment. Once the system confirms the correct tension of the yarn picked by the needle, the separator finger separates the current yarn from the yarn layer, and the yarn nozzle hooks the yarn towards the scissor to cut it. Meanwhile, the yarn holding device component keeps the current yarn in the separator finger position, waiting for the reed hook to grab it and pull it through the stop reed, reed, and reed. (The pick needle model is selected based on the thickness of the customer's yarn, such as a 60-count yarn requires a No. 12 pick needle. The pick needle is mounted on the needle seat.)