Abstract: Apparatus for feeding seriatim discrete webs of paper, cardboard or synthetic plastic material to one or more processing machines has a pair of continuously driven transporting rolls, a first and a second pair of intermittently driven advancing rolls, and first and second guides which respectively compel webs to travel from the nip of the corresponding advancing rolls into the nip of the transporting rolls. Two photocells are adjacent to each guide and each photocell is shiftable in and counter to the direction of travel of a web from the respective advancing rolls toward the transporting rolls. That photocell of each pair which is nearer to the respective advancing rolls causes the generation of a visible or audible signal in response to detection of the leader of a fresh web, and the other photocell of each pair transmits a signal in response to detection of the trailing end of a running web.