Patent ID: 8903279
Filing Date: 2014-12-02
Classification: F16H,G03G

Abstract:
1. A drive unit, comprising: a drive pulley connected to a drive source; a driven pulley connected to a target to be moved; at least one relay pulley to transmit power from the drive pulley to the driven pulley; a plurality of belts entrained around and stretched taut between the drive pulley, the driven pulley, and the relay pulley, the plurality of belts including a first belt entrained around the drive pulley and the relay pulley, and a second belt entrained around the relay pulley and the driven pulley; a first tension application device to contact the first belt to provide tension thereto; and a second tension application device to contact the second belt to provide tension thereto, wherein the first belt and the second belt have a positional relation in a direction of rotation thereof in that a cyclic speed variation component in one rotation period of the first belt transmitted to the driven pulley via the relay pulley and a speed variation component in one rotation period of the second belt transmitted to the driven pulley counteract each other.