Roller guide rail pair

The utility model discloses a roller guide rail pair which comprises a linear guide rail, a sliding block, a roller and a return mechanism, the sliding block moves on the linear guide rail through the roller, the return mechanism is composed of two return devices of the same structure, and the two return devices are symmetrically installed at the two ends of the sliding block in the moving direction of the sliding block on the linear guide rail. The reverser is provided with a reversing arc channel for the rollers to stably and smoothly return circularly, the width of the reversing arc channel is larger than the axial length of the rollers, the depth of the reversing arc channel is larger than the diameter of the rollers, and two channel openings of the reversing arc channel face the sliding block. The pin rollers are transversely arranged in the return arc channels in the mode that the axial ends of the pin rollers face the channel side walls of the return arc channels, and the pin rollers reciprocate betwee