(under subclass 49) Device provided with at least two driven material-engaging advancing elements, only one or only another of which is selected for advancing engagement with the material at any one time.
(1) Note. The usual example of claimed subject matter placed herein involves a feed-roll-couple* comprising one driven roll* and one pressure roll engaging material on opposite sides thereof, and another feed-roll-couple separate from the first-mentioned couple. However, a patent claiming a first feed couple comprising a first driven roll cooperating with a pressure roll to feed material which is between the rolls and a second feed couple comprising a second driven roll cooperating with the same pressure roll, the pressure roll engaging with either the first or the second driven roll to move the material either in one direction or in an opposite direction, would also be placed herein since the common pressure roll is alternatively part of the first feed couple or the second feed couple.
(2) Note. Also included herein are exemplary patents disclosing two separate feedroll*, each rotated by its own drive shaft, in which one shaft is connected through a clutch to a power source or the other shaft is connected through another clutch to the same power source. The shafts are oppositely and alternatively driven through their respective clutches whereby the material is advanced in a forward or reverse direction. For other patents wherein the same roll is driven alternatively in opposite directions, see subclass 51.
