Patent ID: 9346645
Filing Date: 2016-05-24
CPC Classification: B65H,F16H

Claim Text:
1. An apparatus for driving a pair of nip rollers at a rotational velocity that varies within each revolution, comprising: a first nip roller and a second nip roller, the first and second nip rollers forming a nip therebetween for moving a sheet or signature; a drive, the drive configured and arranged to drive at a constant rotational speed; a first variable rotational speed coupling having an input coupled to the drive, the first variable speed coupling having an output connected to the first nip roller that rotates the first nip roller at a rotational speed that varies within each revolution; a second variable rotational speed coupling having an input coupled to the drive, the second variable speed coupling having an output connected to the second nip roller that rotates the second nip roller at the rotational speed that varies within each revolution.