Image recording apparatus

摘要

An image recording apparatus for recording an image on a sensitive material mounted on a drum by emitting light beams to the sensitive material. The apparatus includes a cylindrical drum for supporting the sensitive material mounted peripherally thereof, a drive mechanism for rotating the drum with a rotary shaft disposed on an axis of the drum, guide members formed in opposite end surfaces of the drum and extending circumferentially about the rotary shaft, a pair of counterweights movable along each of the guide members, a moving mechanism for engaging each of the counterweights and moving relative to the drum, thereby to move the counterweight along the guide member, and a fixing mechanism for fixing the counterweight to the guide member in time of image recording.