Drive unit and image forming apparatus including same

摘要

A drive unit includes a drive pulley connected to a drive source, a driven pulley connected to a target to be moved, at least one relay pulley for transmitting power from the drive pulley to the driven pulley, a 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, and a second tension application device. The first tension application device contacts the first belt to provide tension thereto. The second tension application device contacts the second belt to provide tension thereto. A cyclic speed variation component of the first belt in one rotation period transmitted to the driven pulley via the relay pulley and a speed variation component of the second belt in one rotation period transmitted to the driven pulley counteract each other.

主权项

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 configured 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 configured to contact the first belt to provide tension thereto; and a second tension application device configured to contact the second belt to provide tension thereto, wherein the first tension application device and the second tension application device are disposed such that a winding angle of the first belt wound around the drive pulley coincides with a winding angle of the second belt wound around the relay pulley.