Electrophotographic copying machine with device for eliminating unwanted black areas

Claim 1

In a copying machine which performs copying process including light-exposure routine and developing routine and comprises a document table for placing thereon an original document to be copied, a photosensitive body for forming thereon a patent image of said original document, a developing station for carrying out said developing routine, and an auxiliary light source disposed near said developing station, the improvement wherein said copying machine further comprises a device for eliminating unwanted black areas, said device including a detector for determining whether a bulky original or a sheet-like original is placed on said document table to be copied and outputting a detection signal upon determining that a bulky original is on said document table, a control means for calculating the timing at which said auxiliary light source comes to confronting positions with respect predetermined parts of said latent image, and a driving means for operating said auxiliary light sources according to said timing calculated by said computing means, said control means being programmed to activate said driving means only upon receiving said detection signal.