Intermittent feeding apparatus for a web of paper or plastics material

Claim 1

Apparatus for intermittently feeding a web of material, comprising a pair of feed rollers, intermittent rotating means for the feed rollers comprising a reciprocatable rack coupled to the feed rollers by transmission gears and a clutch, means for reciprocating the rack, said reciprocating means comprising a reciprocating drive for rocking a rocker arm about a pivot of fixed location by means of a first link hinged to the rocker arm, a second link hinged to the rocker arm and to the rack, and adjusting means on the rocker arm for altering the spacing between the pivot of the rocker arm and the hinge point to the rocker arm of one of the links, said reciprocating drive comprising a crank disc, said first link comprising a crank rod connected to the rocker arm by a first hinge pin and said second link comprising a connecting rod connected to the rocker arm by a second hinge pin, said adjusting means comprising a rotatably mounted screw-threaded spindle extending along the rocker arm and engaged therewith, a nut member which carries one of the hinge pins aNd is slidable along the rocker arm upon rotation of the spindle, said spindle being rotated by bevel gearing comprising a pinion substantially coaxial with the pivotal axis of the rocker arm and a gear fixed to the spindle.