Abstract: System for controlling the loading or unloading a cable [2] or the like onto a drum [3], wherein the drum [3] has a known first rotation axis loading or unloading the cable, the system also comprises an imaging means [1] aimed at the cable [2] from a position at a distance from the drum rotation axis, the imaging means [1] being adapted to measure the direction of the cable [2] relative to the rotational axis of the drum. The imaging means can be constituted by a video camera.

Abstract: System for controlling the loading or unloading a cable [2] or the like onto a drum [3], wherein the drum [3]has a known first rotation axis loading or unloading the cable, the system also comprises an imaging means [1] aimed at the cable [2] from a position at a distance from the drum rotation axis, the imaging means [1] being adapted to measure the direction of the cable [2] relative to the rotational axis of the drum. The imaging means can be constituted by a video camera.

Abstract: A tensioning device (7) for tensioning of a rope or cable (5) to be spooled onto or off a winch drum (4), the tension device (7) comprising wheels (10, 20, 30, 40), drums and/or belts(10, 20, 30, 40), characterised in that the wheels, drums and/or belts (10, 20, 30, 40) are arranged to be displaced from an disengaged position where the rope or cable (5) is running freely through the tensioning device (7), and an engaged position where the rope or cable (5) rests against said wheels, drums and/or belts (10, 20, 30, 40) that are provided with braking means (13) to withhold the rope or cable (5) to provide a tension, is described. A hoisting device comprising a tensioning device (7) is also described.