Method of and apparatus for manipulating running webs of paper and the like

摘要

A web of tipping paper for the making of filter cigarettes or a similar web of flexible wrapping material is advanced by two spaced-apart pairs of driven rolls through a processing station between the two pairs of rolls. The treatment includes flexing successive increments of the running web by a roller which is borne by a lever or an analogous carrier extending radially from the rotary output shaft of a torque motor capable of causing the roller to subject the web to an at least substantially constant stretching force regardless of the selected position of the carrier. To this end, the motor receives signals from a regulator which, in turn, receives signals from a sensor monitoring the web for the presence of splices and/or other weakened portions and/or from a device which monitors the position of the carrier. The apparatus can further comprise a stationary or a mobile curling tool which engages the web adjacent to the locus of contact between the roller and the web.