Abstract: An improved high speed in-line inserting method and apparatus which allows a modular construction and greater simplicity due to reliance on mechanical supporting and gripping procedures. Folded newspapers or other signatures are carried rectilinearly along an endless belt and supported within a pivotable frame and affixed frame. The pivotable frame and the fixed frame are provided on their distal ends with mechanical cam actuated gripping means to positively open a newspaper which includes a folded lap on its top half so that an insert may be impelled into a forwarded and upwardly opening pocket. The thusly formed composite newspaper is then advantageously discharged onto a self shingling endless belt below the first endless carrier belt. Inserts for impelling into the signature or folded newspaper are advantageously disclosed to be fed from a feeder hopper which includes a vibrating end plate and a bottommost feed through a suction pick-up and nipper rolling procedure.