The invention relates to a weighing mechanism (14) for a roll of material (2) in a rotary printing press, which uses a simple mechanism for weighing a roll of material (2), wherein the weighing The organization (14) is improved in cost, function, and process. The weighing mechanism (14) has a movable lifting frame (5) by means of which the entire material roll can be lifted from the conveying mechanism (1) in order to weigh the roll of material (2). The movement is performed by at least one lifting mechanism (7), and at least two pressure gauges (9) for obtaining weight are provided between the lifting frame (5) and the lifting mechanism (7), only the force fitting is performed on the pressure gauge. The lifting frame (5) is supported in a connected manner.
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