A movement assembly with work articles movable on threaded drive shaft by shaft rotation

摘要

A movement assembly including a drive axle (21); a number of threaded drive portions (22) operativeIy associated with the axle; two or more work articles (12) positioned in a row aligned with the longitudinal axis of the drive axle; at least one work article having a complimentary thread (18) engaged with an associated drive portion; characterised in that the movement assembly is configured such that rotation of the drive axle causes the threaded drive portions to turn and alter the spacing between the engaged work articles along the row. At least one threaded drive portion is also coupled to a work article adjacent to that which it is associated.