| 摘要 |
At least the body (2') of the roller is made of light material such as resin reinforced with carbonium fibres, whereby the speed of the cylinder may be increased within 30% and 60%. Preferably (fig. 4), the body (2') of the roller (2) is provided with a differentiated wall thickness (s). It is thicker in the middle, whereby at parity of weight and speed the camber (f) of deflection, is lower. Or (figure 3) the body (2') of the roller is provided with the outer surface strangulated in the middle, by a negative entity (-f), substantially corresponding to the tolerated active camber (f), whereby, at parity of weight and of speed, the camber decreases or at parity of camber the speed may be increased. |
