An arrangement comprises a stacker configured to stack planar workpieces into stacks, and a cutter configured to cut preforms out of planar workpieces. The cutter is located downstream of said stacker on a manufacturing line, and a conveyor exists between said stacker and cutter. The arrangement comprises a conveyor controller, which is configured to, after transferring a stack from said conveyor to a feeder section of said cutter, rewind the conveyor to place a foremost free location after existing stacks on the conveyor to a position where it is ready to receive a stack from said stacker.