Patent ID: 7364035

Claim:
An accumulation conveyor, comprising: a plurality of tandem accumulation zones; each of said zones including a conveying surface and at least one drive roller selectively driving said conveying surface; a drive member below said conveying surface, said drive member extending a length of said plurality of tandem accumulation zones; each of the zones including a clutch roller rotated by said drive member; and each of the zones including an electromagnetic clutch, said clutch selectively transferring rotation of said clutch roller to said drive roller to drive said conveying surface, said clutch comprising a pair of concentric cylinders having portions aligned in a vertical plane and a force transmission member selectively transmitting force between said concentric cylinders, one of said concentric cylinders rotational with said clutch roller and the other of said concentric cylinders rotational with said drive roller, said force transmission member transmitting force between said concentric cylinders when said clutch is electrically actuated.