Invention Grant
US09346645B2 Variable rotational speed coupling for a pitch changing or slow down device 有权
变速或减速装置的可变转速联轴器

Variable rotational speed coupling for a pitch changing or slow down device
Abstract:
An apparatus for driving a pair of nip rollers at a rotational velocity that varies within each revolution is provided. A first nip roller and a second nip roller form a nip therebetween for moving a sheet or signature. A drive configured and arranged to drive a drive shaft at a constant rotational speed. A pair of variable rotational speed couplings each have an input coupled to the drive, and an output connected to a respective one of the first and second nip rollers. Each coupling rotates its respective nip roller at a rotational speed that varies within each revolution.
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