Patent ID: 7717148

Claim:
A machine comprising an idler roller at the end of a first moment arm and a web positioning roller at the end of a second moment arm and cooperating to at least partially define a serpentine web path through said machine, a position of said positioning roller being freely adjustable within a predetermined range during operation of said machine, said machine further comprising a web tension nulling mechanism effective to cancel out forces exerted on the web positioning roller resulting from tension in said web such that said forces do not substantially affect the position of said positioning roller within said predetermined range, the web tension nulling mechanism being operatively coupled between the idler roller and the web positioning roller such that a vector sum of a first moment acting on the idler roller resulting from tension in said web and based on the first moment arm, and a second moment acting on the web positioning roller resulting from tension in said web and based on the second moment arm, is substantially zero.