Motion guide device

A motion guide device, comprising:

• a track rail;
• a plurality of rolling elements configured to roll on the track rail;
• a moving block, which has an endless circulation path for the rolling elements, the moving block being configured to freely move along the track rail;
• and
• a compressible holding belt having pockets, the pockets being arrayed at predetermined intervals and being configured to receive the rolling elements, the holding belt capable of being incorporated into the endless circulation path, the holding belt being configured to move in the endless circulation path together with the rolling elements,
• wherein the holding belt has a pair of end portions opposed to each other through intermediation of a free rolling element in the endless circulation path, and
• wherein a condition of (X−Y)×Z>(B+C)−A>0 is satisfied, where:
• A represents a path length of the endless circulation path, the path length corresponding to a length of one track formed by a locus of centers of the plurality of rolling elements and the free rolling element when disposed in the endless circulation path;
• B represents a total length of the holding belt when not disposed in the endless circulation path;
• C represents a diameter of the free rolling element;
• X represents a diameter of each of the pockets;
• Y represents a diameter of each of the rolling elements;
• and
• Z represents the number of the rolling elements arrayed in the holding belt.