Reliable sheet separation of the air-suction bottom feeding system with automatic feeding of non-stop operation of the equipment; easy regulation of the positioning structure of the paper with accurate positioning; ensuring the precision of finished products regarding the parts of vertical and cross creasing under the high-speed running of the machine; rotary sizing applicable for any forms of glue lines; provided with the folder for the suction roller for the stable production in a high-speed state; visible and accurate regulation of the dial under the condition of fine adjustment; mounted with electric counter and automatic delivery unit on the collecting part.