Patent ID: 7325369

Claim:
An apparatus for rotating a cap relatively to a container, the container moving along a predetermined path at a container speed, the cap having a first and a second cap engagement location, the first and second cap engagement locations being circumferentially spaced apart relatively to each other, said apparatus comprising: a first cap engaging component, the first cap engaging component including a first component cap engaging surface for engaging the cap at the first cap engagement location and applying a first substantially tangential force thereto, the first cap engaging surface moving at a first speed when substantially in register with said first cap engagement location; a second cap engaging component, the second cap engaging component including a second component cap engaging surface for engaging the cap at the second cap engagement location and applying a second substantially tangential force thereto, the second cap engaging surface moving at a second speed when substantially in register with said second cap engagement location; and a differential operatively coupled to said first and second cap engaging components in a manner such that said differential maintains substantially constant a sum of said first and second speeds.