Ultrasonic seamless sewing technology cleverly uses the principle of ultrasonic bending vibration to convert the length of the high-frequency ultrasonic longitudinal vibrator into the diameter of the bending vibrator. Moreover, the vibration direction is also rotated by 90 degrees, which converts the longitudinal vibration into the radial vibration of the disc welding head, and the installation method is also changed from vertical cloth installation to parallel cloth installation. This not only greatly reduces the volume of the vibration system itself, but also greatly reduces the installation size, the whole machine is beautiful, the volume is reduced, and the weight is greatly reduced. What's more gratifying is that the output end of the bending disk vibration system is a transverse ultrasonic vibration, and the welding head rotates around its own axis. Just press the pressing wheel on the cylindrical surface of the welding head to make it rotate synchronously with the welding head. The processed fabric is pulled by the welding head and the pressure roller and passes between them. The cloth heats and melts under the action of ultrasonic waves, and two or more layers of cloth are bonded together, so as to achieve the purpose of welding the cloth. It has the characteristics of fast welding speed, high precision, beautiful welding seam, low energy consumption and simple operation. Can achieve the purpose of stitching. Here, the rotation of the welding head and the pressure wheel are completely synchronized and in the same direction, there is no speed difference and angle difference, and it will not cause the stretching, distortion or deformation of the fabric, and the accuracy is extremely high. The cloth heats and melts under the action of ultrasonic waves, and two or more layers of cloth are bonded together, so as to achieve the purpose of sewing the cloth. If the pressure wheel is replaced by a cutter wheel, it will constitute a perfect cutting edge banding machine, which will heat-melt and seal the trimmed edge while cutting the fabric. It has the characteristics of fast welding and cutting speed, high precision, beautiful welding seam, small size, low energy consumption, no noise and so on. It represents the development direction of ultrasonic cutting sewing machine.