VARIABLE ROTATIONAL SPEED COUPLING FOR A PITCH CHANGING OR SLOW DOWN DEVICE

摘要

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.

主权项

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 a drive shaft 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.