Patent ID: 10005636

Abstract:
A device for automatically unwinding web-shaped materials (8) from a master roll (3), and to a method for operating a device of this type are disclosed. The device has an infeed arm (2) and a first drive unit (6), wherein the master roll (3) by way of the winding core (4) thereof is rotatably mountable on the infeed arm (2), and the first drive unit (6) serves for introducing a driving force into the master roll (3). In order for high productivity to be achieved, the unwinder (1) has an outfeed arm (13) to which a second drive unit (14) for introducing a driving force into the master roll (3) is assigned, wherein the master roll (3) during an unwinding procedure is transferable from the infeed arm (2) to the outfeed arm (13). The material web (8) is then unwound from the master roll (3) which is mounted on the infeed am (2) down to a predefinable minimum diameter, wherein during the ongoing unwinding procedure the master roll (3) is subsequently transferred to the outfeed arm (13) and thereon is further actively unwound, wherein a new master roll (3′) is received by the infeed arm (2). Unwinding without interruption is thus enabled.