slitting machine is to use a traditional control scheme(http://www.jz-brother.com/product-6150/slitting-machine.html) a large-volume motor to drive the retractable shaft, the retractable reel plus a magnetic clutch, clutch by adjusting the magnetic current to control the resistance they have to control the material surface tension.
slitting machine is a wide-format paper or film will be cut into multiple narrow the mechanical equipment, commonly used in film, paper making machinery and printing and packaging machinery.