Importance

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Abstract

In the case of a method of folding stacks of sheets, which can consist of one or of a plurality of sheets that may have different folding resistances, by supplying a plurality of stacks of sheets to a folding device by means of a temporally successive, cyclic supply which comprises phases of movement and pauses in movement, a stack folding resistance for a respective stack of sheets is first determined on the basis of at least the number and/or the folding resistance of the individual sheets forming a stack of sheets. Following this, the respective stack of sheets is folded, the folding speed used by the folding device for folding said stack of sheets being controlled in dependence upon the stack folding resistance that has been determined for this stack of sheets, the control of the folding speed of the folding device being carried out during respective pauses in movement of the cyclic supply. In the case of a reduction of the folding speed, the pause in movement is extended for the folding of the next stack of sheets to be folded, if the necessary folding-speed reduction is not achieved during the normal pause in movement of the cyclic supply. And in the case of an increase in the folding speed, the pause in movement is, depending on the time required, either extended for the folding of the next stack of sheets to be folded, if the necessary increase in the folding speed is not achieved during the normal pause in movement of the cyclic supply, or not extended for the folding of the next stack of sheets to be folded, although the necessary increase in the folding speed is not achieved during the normal pause in movement.

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First Claim