| 摘要 |
PURPOSE:To hold equalizing action of a contact between eack roller and coil spring, by meshing a screw wheel to the cylindrical coil spring at an opposite side to a side of screwing with a free rotating roller train and applying rotary driving motion to the cylindrical spring from the screw wheel. CONSTITUTION:A cylindrical coil spring 9' of an external thread member 9 is locked with axial movement at each pitch by meshing with a driving screw wheel 19, while actuated in a cantilever state as a spring of 1 pitch and flexed in a screwed part with opposite side internal thread rollers 4, and axial flexion of each part in the cylindrical coil spring 9' for the roller train 4 can be equally set. As a result, the flexion is not locally increased, while a mounting error of the roller is fully small, and a uniform contact of each part, by pring action for several rollers in a screwed state, can equalize load distribution and well perform smooth screwing at engagement and disengagement. |
