Patent ID: 7669529

Claim:
An apparatus comprising: a) a sheet materials drum; b) at least one clamp pivotably arranged on the sheet materials drum, the at least one clamp having a first region and a second region, the second region capable of clamping a materials sheet to the cylindrical surface of the sheet materials drum, a pivot axis of the at least one clamp being between the first region and the second region of the clamp; c) a backbone extending along a length of the sheet materials drum, the backbone capable of being removably attached to the sheet materials drum; and d) at least one push rod movably arranged on the backbone, the at least one push rod arranged to be capable of pushing against the first region of the at least one clamp; wherein the backbone comprises at least one latch arranged on the backbone, the latch capable of mechanically engaging the sheet materials drum to removably attach the backbone to the sheet materials drum.