Patent attributes
The invention relates to a crinkling device comprising a slide rod (16), to which a second crinkling element (15) is fastened. The slide rod is guided in a frame (2) so as to be movable in a substantially vertical direction between a lower position (L), in which the second crinkling element (15) is out of contact with the lower edge (4) of a foil web (1), and an upper position (U), in which the second crinkling element (15) deflects the lower edge (4) of the foil web (1) upwards so as to crinkle it. The slide rod returns to the lower position (L) when not exposed to a force acting in the upward direction. The device further comprises first coupling means (171, 181) for forming a releasable coupling between the slide rod (16) and a first drive element portion (8) when the drive element (7) is running in a first direction (11) to move the second crinkling element (15) to the upper position (U). Second coupling means (172, 182) are provided to form a releasable coupling between the slide rod (16) and a second drive element portion (9) when the drive element (7) is running in a second direction (12) to move the second crinkling element (15) to the upper position (U). By driving the drive element (7) in the first running direction (11), the foil web (1) can only be crinkled from its lower edge (4). By driving the drive element (7) in the second running direction (12), the foil web (1) can be crinkled optionally either from the upper edge (3) by a first crinkling element (14) without crinkling the lower edge (4) or from the upper edge (3) and the lower edge (4) simultaneously.
