Device for the rotation of sheets on a roller conveyor

A device for rotating sheets on a sheet conveyor, said conveyor comprising a plurality of rotating cylinders defining a transport plane (P) and a lateral guide rail which extends in a longitudinal direction of said conveyor, and further comprising a pair of rollers entrained in rotation at mutually different speeds and spaced apart from each other and from said guide rail transversely to said longitudinal direction, each of said rollers having an axis inclined with respect to a direction normal to said longitudinal direction by a determined angle which is greater for one of said rollers which is closer to said guide rail and has a lower speed of rotation, and each of said rollers having a periphery opposed to an associated rotary support element substantially in said transport plane, wherein said rollers have rotation axes inclined in a sense so that sheets passing between said rollers and said rotary support element tend to retract from said guide rail.

A device for rotating sheets on a sheet conveyor, said conveyor comprising a plurality of rotating cylinders defining a transport plane (P) and a lateral guide rail which extends in a longitudinal direction of said conveyor, and further comprising a pair of rollers entrained in rotation at mutually different speeds and spaced apart from each other and from said guide rail transversely to said longitudinal direction, each of said rollers having an axis inclined with respect to a direction normal to said longitudinal direction by a determined angle which is greater for one of said rollers which is closer to said guide rail and has a lower speed of rotation, and each of said rollers having a periphery opposed to an associated rotary support element substantially in said transport plane, wherein each rotary support element is constituted by a ball mounted in free rotation in a vertical cylindrical guide of said conveyor.

A device for rotating sheets on a sheet conveyor, said conveyor comprising a plurality of rotating cylinders defining a transport plane (P) and a lateral guide rail which extends in a longitudinal direction of said conveyor, and further comprising a pair of rollers entrained in rotation at mutually different speeds and spaced apart from each other and from said guide rail transversely to said longitudinal direction, each of said rollers having an axis inclined with respect to a direction normal to said longitudinal direction by a determined angle which is greater for one of said rollers which is closer to said guide rail and has a lower speed of rotation, and each of said rollers having a periphery opposed to an associated rotary support element substantially in said transport plane, wherein one of said rotary support elements which is closest to said guide rail can be selectively raised.

A device for rotating sheets on a sheet conveyor, said conveyor comprising a plurality of rotating cylinders defining a transport plane (P) and a lateral guide rail which extends in a longitudinal direction of said conveyor, and further comprising a pair of rollers entrained in rotation at mutually different speeds and spaced apart from each other and from said guide rail transversely to said longitudinal direction, each of said rollers having an axis inclined with respect to a direction normal to said longitudinal direction by a determined angle which is greater for one of said rollers which is closer to said guide rail and has a lower speed of rotation, and each of said rollers having a periphery opposed to an associated rotary support element substantially in said transport plane, wherein each of said cylinders has an associated support ball mounted in free rotation in the vicinity of said guide rail.