Magnetkopfpositionierungsmechanismus mit einer selbstzentrierenden Verstellschraubenspindel

摘要

A magnetic head positioning mechanism for a tape backup device includes a carriage 14 carrying the head 10 that has an opening (Fig 4, 15) with a substantially conical surface, a guide rod 30 extending through the carriage that restricts translation of the carriage to motion along a predetermined axis, a lead screw 20 extending into the opening in the carriage that is driven by a stepper motor 50 via a gear train 51, 22, a follower nut 40 threaded on the upper portion of the lead screw for translating the carriage and head along the axis as the lead screw is rotated by the stepper motor, and a spring (Fig. 1 60) for urging the carriage into contact with the follower nut The base end of the lead screw 20 has a conical indentation 24 that contacts and rotates on the rounded end (Fig. 3 6) of a protrusion 4 extending from the chassis 2. The relative positions of this indentation and protrusion can be reversed, if desired. The follower nut includes a rounded (or spherical) surface (Fig. 4 42) for contacting the conical surface (Fig 4 15) within the opening in the carriage. The combination of the conical indentation at the base of the lead screw and the rounded surface on the follower nut at the upper portion of the lead screw allows the lead screw to pivot and self-align. This relaxes the required tolerances for alignment and simplifies assembly of the device.