Assembly to generate accurate linear motion in e.g. machine tool has a spindle with several elongated grooves in the mantle

摘要

An assembly (1) effects a defined linear movement along a threaded spindle (6) whose outer thread (16) is on contact with an element is also engages with a complementary inner thread with an axial form-fit. The inner thread element is free to rotate against a retaining block (2). The threaded spindle (6) mantle (12) has one or more extended grooves (14) in addition to the outer thread. These engage with the moving inner thread (26) and have a different pitch to that of the outer thread (13) in which one or more of the holding block (2) elements guide the spindle (6).