Feed and cutting device for dividing a continuous web into portions

A feed and cutting device for dividing a continuous web into portions, comprising, from upstream to downstream along a plane known as the feed plane, means for guiding the web along said plane and constituted by a pair of mutually tangential rollers, means for feeding the web along said plane and means for cutting the web into portions, at least one of said guide rollers being mounted on a shaft coaxial thereto and rotating with continuous motion, and being connected to said shaft by a self-locking device which prohibits any discordant relative rotation between said guide roller and said shaft but which allows idle rotation of said guide roller on said shaft at an angular speed exceeding the angular speed of said shaft, the angular speed of said shaft being close to but less than the angular speed transmitted to the respective guide roller by said feed means by way of said web, said feed means operating with intermittent action, such that during each period of intermittent action they drag lengths of web having a length approximately equal to the length of said portions, means for adjusting said web with respect to said cutting means and which cooperate with reference marks provided on the web, the adjusting means operating within the time interval between the unwiding of two successive lengths of web by said feed means.