Web feeding apparatus

Web feeding apparatus comprising a first feed roll, a second feed roll downstream of the first feed roll, said first and second feed rolls each being rotatable at a predetermined constant peripheral velocity, said first and second feed roll velocities being different, a third feed roll downstream of the second feed roll, a fourth feed roll downstream of the third feed roll, said third and fourth feed rolls being synchronously intermittently rotated with accurate angular displacements of predetermined extent followed by simultaneous periods of dwell of predetermined duration, first, second, third and fourth pressure rolls cooperative with said first, second, third and fourth feed rolls, and pressure roll positioning cooperable with each pressure roll and selectively operable to individually move the pressure rolls into and out of cooperative relation with the respective feed rolls, the arrangement being such that during normal web feeding operation of the apparatus one or other of the first and second pressure rolls co-operates with its respective feed roll to feed into a loop between the second and third feed rolls a portion of web the length of which approximates to that of the length of web fed by the third and fourth feed rolls in co-operation with their respective pressure rolls during one period of angular displacement of the third and fourth feed rolls.