An unloading device and an unloading method for a gantry-type machining center beam guide rail is disclosed, which is used to be installed on a sliding plate assembly, comprising a first booster mechanism and a second booster mechanism. When a worm rotates and drives a worm gear to rotate, an axial displacement can be generated by the worm gear along a worm gear shaft to push the retaining sleeve assembly, and an unloading force generated acts on a first mounting bracket. An unloading bolt of the second booster mechanism is connected with a press plate through threads, the unloading bolt is rotated to generate an axial displacement, and a second sliding block is pressed tightly against an unloading guide rail vertical surface by a second mounting bracket to generate an unloading force.

A linear-motion stage that is angularly or radially symmetric or asymmetric, or monolithic may be used as the moving mechanism in a Fourier transform spectrometer. In embodiments, a linear-motion stage includes a base; a first multiple-arm linkage extending from the base to a first carriage attachment end; a second multiple-arm linkage extending from the first carriage attachment end to the base; a third multiple-arm linkage extending from the base to a second carriage attachment end; a carriage extending from the first carriage end to the second carriage end. Also in embodiments, the first, second, and third multiple-arm linkages comprise a first arm rotateably connected to a second arm through a flexure, the angular travel of the first arm is configured to be different than an angular travel of the second arm as the carriage moves along the carriage motion line.

A linear-motion stage that is angularly or radially symmetric or asymmetric, or monolithic may be used as the moving mechanism in a Fourier transform spectrometer. In embodiments, a linear-motion stage includes a base; a first multiple-arm linkage extending from the base to a first carriage attachment end; a second multiple-arm linkage extending from the first carriage attachment end to the base; a third multiple-arm linkage extending from the base to a second carriage attachment end; a carriage extending from the first carriage end to the second carriage end. Also in embodiments, the first, second, and third multiple-arm linkages comprise a first arm rotateably connected to a second arm through a flexure, the angular travel of the first arm is configured to be different than an angular travel of the second arm as the carriage moves along the carriage motion line.