JPS6482025A - Original cover device for copying machine - Google Patents

Abstract

PURPOSE:To prevent the damage of the glass surface of an original platen by controlling a reciplocating means so that originals are held down by means of an original cover roller in synchronization with the exposure and movement of an exposing means. CONSTITUTION:A controller 10 outputs drive signals to the driving part of a light lamp 50. At that time, the controller 10 determines the distance that the lighting lamp 50 moves to the right with the aid of detecting signals from a size detector 65. According to the size of the original 36, the controller 10 controls the driving time of a driving motor 20. Moreover, the controller 10 outputs the driving signals to the moving motor 65 of the light lamp 50, and simultaneously outputs the driving signals to a presser motor 25 in synchronization with the driving part of the lighting lamp 50. Thus, the lighting lamp 50 irradiates the original 36 conveyed by the rotation of a cover sheet 4, and the original is copied in an original position P while it is pressed by the cover roller 6. Therefore the copying accuracy is improved, and the damage of the original platen is minimized.