Patent ID: 6252646
Filing Date: 2001-06-26
Classification: G03B

Abstract:
A photosensitive material exposure apparatus which records an image on a photosensitive material by main-scanning the photosensitive material by an exposure device while sub-scanning the photosensitive material by an exposure drum which is driven and rotated by a driving force of a driving device, comprising:a punching unit which is provided along a second path disposed at a downstream side of said exposure drum and branching from a first path leading to a subsequent process, said punching unit which punches holes at a leading edge portion of said photosensitive material;a punching controller which controls punching of said punching unit, said punching controller which is provided along the second path, and which has a sensor for detecting the leading edge portion of said photosensitive material so that said punching is instituted;a positioning controller which positions a main-scanning starting line being spaced apart from a hole-punched portion of said photosensitive material at a fixed distance, on said photosensitive material, at an image recording starting position of said exposure drum by conveying said photosensitive material back by reverse rotation of said exposure drum after the holes are punched by said punching controller, and by measuring with an encoder a predetermined amount of said photosensitive material conveyed back;a guiding controller which, when it is necessary to punch holes at the leading edge portion of the photosensitive material, guides the photosensitive material to the second path by having the photosensitive material pass without an image recorded thereon at an image recording position of the exposure drum; andan encoder mounted to the drum and connected to the positioning controller, the encoder providing a signal for the positioning controller to determine when the drum has rotated the predetermined amount.