Abstract: An apparatus for controlling a tension of a sheet delivered from a rotatable sheet roll includes a brake device including a shaft connectable to the sheet roll for rotation therewith, a brake disc fixedly mounted on the shaft, and a friction member rotatably mounted on the shaft.

Abstract: A marking apparatus for coloring a lateral edge of a sheet moving along its longitudinal axis includes a marking head including a body and a tubular shaft mounted on the body for rotation about an axis of said shaft. A roller is fixedly mounted on the tubular shaft for rotation therewith. An elongated coloring element of a solid material is received in the tubular shaft for rotation therewith and has one end extending outwardly of one end of the tubular shaft a predetermined distance. An actuator is operable to move the marking head in a plane perpendicular to the plane of the sheet parallel to a plane in which the lateral edge of the sheet lies so as to bring an end face of the one end of the coloring element into contact with the lateral edge of the sheet to apply a marking thereto. The axis of the tubular shaft is disposed transversely of a path of travel of the sheet and inclined with respect to the plane of the sheet.