Abstract: A motion device including a carriage for traveling along a rail. The carriage can have at least one rotatable fixed position roller, and at least one rotatable adjustable roller that is movable relative to the at least one fixed position roller for self compensating for play between the rollers and mating surfaces of the rail. Each adjustable roller can be part of a movable roller portion movably mounted to the carriage. The movable roller portion can be adjustably movable by a self adjustment mechanism. The self adjustment mechanism can include a mechanical advantage pushing member for movably engaging the movable roller portion. The mechanical advantage pushing member can be resiliently biased against the movable roller portion by a biasing arrangement. The biasing arrangement can cause movement of the mechanical advantage pushing member and the movable roller portion for moving the at least one adjustable roller for self compensating for play.

Abstract: A centralizing bushing assembly includes a bushing housing having axial ends and an opening extending therethrough along an axial axis. The opening can have a pocket extending outwardly from the axial axis within the bushing housing and have internal shoulders axially facing each other. A bushing ring can be positioned within the pocket of the bushing housing between the internal shoulders. The bushing ring can have a split for allowing collapsing of the bushing ring radially inward and have an inner diameter for slidably engaging an axially movable shaft extending through the bushing housing along the axial axis and also have an outer shoulder. A resilient biasing member can be positioned against the outer shoulder of the bushing ring for radially biasing the inner diameter of the bushing ring radially inwardly in a centralizing manner about the axial axis for engaging and centralizing the shaft slidably positioned therethrough.

Abstract: A motorized anti-backlash linear actuator comprises a motor; a hollow shaft that is rotated about a central axis by the motor, an anti-backlash nut that is nested at least partially inside the hollow shaft; and an externally threaded rod or lead screw that engages with the anti-backlash nut such that the rotation of the hollow shaft and the nut imparts a linear motion to the rod that is substantially free of backlash. Nesting the anti-backlash nut at least partially within the hollow shaft provides greater stability to the actuator, and permits high speed operation.