Abstract: A configuration for folding sheets with an increased functional reliability and field of use folds sheets of different lengths through the use of folding rolls and an adjustable stop in such a way that automatic matching of a folding gap to a thickness of a material to be folded is carried out and a folding blade and a folding pocket can be dispensed with, while executing the functions of simple folding, multiple folding, turning and smooth passage. The configuration includes folding rolls which rest against each other in a resilient manner and have a given diameter. Pressure rolls with a diameter which is smaller than half the given diameter are disposed in such a manner as to be adjustable and axially symmetrical in relation to the folding rolls. Furthermore, a stop can be adjusted into a region between the pressure rolls and at the same time is a diverting element.

Abstract: A microclimate enriched by solvent vapors is produced in the antechamber during print operation and also predominates during the print pauses, the microclimate having a slightly higher pressure than the outer atmosphere. In this way all nozzles are equally protected against drying out. During print pauses of longer duration, the antechamber is closed and, if needed, is rinsed with solvent. The antechamber is formed by the ink print head being set back in relation to the front wall of the housing. In the front wall opposite the nozzles, openings are made whose width is larger than the diameter of a nozzle opening. The antechamber has a trough-shaped area for the inlet and outlet of solvent by capillary action, and a non-capillary area for the solvent vapors. A seal bonnet is provided for sealing during longer print pauses and cleaning processes.