Vertical arm-single twisting machine 1. Adopt sine changing-frequence changer, other electricity-controlling devices adopt Omron or RKC device 2. Main motor adopt Servomotor 3. It is easy to operate, save human resource 4. Test the tension online, not need to change gear when you want to change pitch, using human-computer interface to adjust It's also can according to your requirement to design the size or other parts.