B - Operations – Transporting – 65 – H
Patent
B - Operations, Transporting
65
H
B65H 45/00 (2006.01) B65H 45/12 (2006.01)
Patent
CA 2265932
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.
L'invention porte sur un procédé de pliage de piles de feuilles pouvant comporter soit une feuille soit plusieurs, lesdites feuilles étant éventuellement caractérisées par différents coefficients de résistance au pliage. Le procédé en question assure, au moyen d'une alimentation cyclique séquentielle, où alternent phases de mouvement et pauses, le transport de piles de feuilles à l'installation de pliage. Il consiste notamment à déterminer, pour une pile de feuilles donnée, la résistance au pliage sur la base au moins du nombre de feuilles constituant la pile et/ou de la résistance au pliage de l'une de ces feuilles. La pile en question est ensuite pliée, la vitesse de la plieuse étant régulée pendant la pause normale intervenant dans l'alimentation cyclique. Lorsque survient une réduction de la vitesse de pliage, on rallonge l'interruption de mouvement pour le pliage de la pile suivante si on ne parvient pas à réduire la vitesse de pliage pendant la phase normale de mouvement de l'alimentation cyclique. Inversement, en cas d'augmentation de la vitesse de pliage, selon ce que le temps exige, soit on rallonge l'interruption de mouvement pour le pliage de la pile suivante si on ne parvient pas a augmenter la vitesse de pliage pendant la pause normale de l'alimentation cyclique, soit on ne la rallonge pas, même si l'on ne parvient pas à obtenir l'accélération nécessaire de l'opération de pliage pendant l'interruption normale du mouvement.
Jorg Helmut
Okelmann Walter
Bowe Systec Ag
Mccarthy Tetrault Llp
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