Abstract: A strap driving device for looping machines has with a strap guiding channel for a looping strap and two pairs of drive rollers engaging in the strap guiding channel. Each pair of drive rollers has a driving roller driven in rotation and a pressing roller to be set to the latter for free running. For being set to the driving roller, the pressing roller is mounted on a rocker.

Abstract: A tensioning device for tautening a looping strap around a product stack is provided with a stationary clamping arrangement, which comprises a controllable clamping lever and an opposite clamping bearing, with a pivotable tension lever, with deflecting rolls for tensioning the strap in the way of a pulley block, with a pivotable rocker lever, which comprises a control ramp and is adjustable in dependence on the height of the product stack, and with a control lever, to be actuated by the control ramp, for the clamping lever, the control lever being pivotably articulated to the tension lever and controlling the clamping lever in accordance with the position, dependent on the stack height, of the control ramp in such a way that when the stack height decreases, the blocking of the clamping arrangement is increasingly retarded and the tensioning length of the looping strap is reduced.