High-precision stepper motor - In order to ensure the accurate transmission of the lining strips, im- ported stepper motors are used to control the length of the lining strips. Imported photoelectric sensor control - the device is easily connected to the ports of pattern machines of different brands. It uses high-magnification signal amplification to trigger the sensor signal to ensure that the device is synchronized with the machine needle and thread trimming mechanism. Adopting a unique weighing rod principle device - the bar winding mechanism is designed with refer- ence to the weighing bar principle, which can ensure the synchronous delivery and collection of the bar, and avoid the bar breaking due to tightness