Roll revolving spindle has spindle which has spiral groove and screw nut is adjusted in spindle, where screw nut has return channel connecting two ends of spiral groove

摘要

The roll revolving spindle has a spindle (1) which has a spiral groove (11,21) and a screw nut (2) is adjusted in the spindle. The screw nut has a return channel, which connects the two ends of the spiral groove. The return channel consists of a straight section and two return sections and the return sections connect the two ends of the straight section and the spiral groove. The return sections are rectangular formed in the cross section, so that the roll (3) are moved rolling inside the straight section.