Abstract: An accumulating live roller conveyor in which articles of different sizes and weights may be stopped when movement of a lead article is blocked. The accumulation is in cascading fashion, and release may either be cascading or simultaneously. The conveyor comprises a series of article-supporting rollers with a powered endless belt having a driving run over one side of said rolls. A plurality of frames fitted with pressure rolls are disposed above the belt, one or more frames corresponding to an accumulation zone. Normally, the rolls hold the belt in driving contact with the article-supporting rollers. A plurality of sensing rolls are each connected to a frame in an upstream zone so that an article engaging a sensing roll will hold the corresponding frame in an upper position, eliminating belt pressure in that zone to stop an article. Following articles will be likewise stopped.