Sheet clamp counterbalancing system for high speed sheet handling drums

Abstract From the Canadian patent

A counterbalancing and sheet clamp retention system for high speed sheet handling drums of the type in which leading and trailing edge clamping bars extend along the length of the drum periphery and are capable of movement between retracted and sheet clamping positions for automatic loading and unloading successive sheets to and from the drum. The clamping bars supported at opposite ends for movement between their respective retracted and clamping positions are engaged, centrally along their length by a retaining device which moves to a clamping bar engaging position under centrifugal force as the rotational velocity of the drum reaches a predetermined value. The retaining device is a …