Abstract: The invention relates to a roll unwinding device for a web-fed printing machine, wherein the roll unwinding device has at least one roll holding device and at least one drive motor connected to the at least one roll holding device via at least one torque transfer device, and wherein the at least one roll holding device is embodied as a clamping shaft and the clamping shaft has at least one carrier element, which is connected to the clamping shaft so as to be movable at least in a radial direction with respect to a rotational axis of the clamping shaft, and wherein the roll unwinding device has at least two clamping shaft bearings, at least one of which is connected and/or connectable to the clamping shaft so as to transfer and/or be capable of transferring torque, and wherein the at least one clamping shaft bearing is connected to the at least one drive motor via the at least one torque transfer device so as to transfer and/or be capable of transferring torque.

Abstract: The invention relates to a roll unwinding device for a web-fed printing machine, wherein the roll unwinding device has at least one roll holding device and at least one drive motor connected to the at least one roll holding device via at least one torque transfer device, and wherein the at least one roll holding device is embodied as a clamping shaft and the clamping shaft has at least one carrier element, which is connected to the clamping shaft so as to be movable at least in a radial direction with respect to a rotational axis of the clamping shaft, and wherein the roll unwinding device has at least two clamping shaft bearings, at least one of which is connected and/or connectable to the clamping shaft so as to transfer and/or be capable of transferring torque, and wherein the at least one clamping shaft bearing is connected to the at least one drive motor via the at least one torque transfer device so as to transfer and/or be capable of transferring torque.

Abstract: A reel changer is usable for supporting a reel of material that is wound on a winding sleeve. The reel holder includes a carrier journal and a plurality of driver elements. These driver elements are arranged such that they engage in a front of the winding sleeve. The number of these driver elements which can engage in the front of the winding sleeve can be varied.

Abstract: A reel changer is usable for supporting a reel of material that is wound on a winding sleeve. The reel holder includes a carrier journal and a plurality of driver elements. These driver elements are arranged such that they engage in a front of the winding sleeve. The number of these driver elements which can engage in the front of the winding sleeve can be varied.

Abstract: A mandrel is utilized to support a roll of material. The mandrel includes a retaining element, which can be placed on an inner circumference of a roll of material, and at least one carrier element which transmits a torque between the mandrel and the material roll. The carrier element can be engaged with the roll of material in a non-positive manner.