Toner cleaning apparatus in electrophotography

摘要

A toner cleaning apparatus for removing a toner left on the surface of an electrophotographic photosensitive material by a doctor blade in the electrophotographic process includes an elastic doctor blade having a toner-scraping top end, a holder for supporting the base of the doctor blade, a fulcrum for swingably supporting the holder and a pressing mechanism for pressing the top end of the doctor blade to the surface of the photosensitive material, wherein the fulcrum and doctor blade are arranged so that on the feed-out side of the photosensitive material, the contact angle alpha between the top end of the doctor blade and the photosensitive material is smaller than the angle beta between the photosensitive material and the line connecting the top end of the doctor blade to the fulcrum, and the pressing mechanism and doctor blade are arranged in such an elastic engagement relation that as the applied stress is increases, the top end of the doctor blade is retreated to the feed-out side and the degree of flexion of the doctor blade is increased.