Abstract: A folding device includes a folding machine with a folding unit, and a prefolding apparatus for prefolding a sheet before it is feeded into the folding unit of the folding machine. The prefolding apparatus includes a sheet stacking apparatus, on which a sheet stack is stored. A perforating or scoring device perforates or creases a sheet fed from the sheet stacking apparatus along a longitudinal center line thereof. A plow folding unit folds the perforated or creased sheet around the longitudinal center line.

Abstract: In the case of the process for producing multi-leaf printed products, different types of sheets, which are printed by various printing methods, are set down one after the other in the conveying direction, in accordance with a freely selectable sequence, on a main conveying device at different set-down stations, the sheets subsequently being folded one after the other and then collated one above the other.

Abstract: In the case of the method of, and the apparatus for, processing sheets further to produce multi-leaf printed products, a plurality of sheets (20) are folded around a folding line (30) and are then collated one above the other such that the folding line (30) is located at the top and the folded sheets (20) open in the downward direction. An adhesive (34) is applied to the sheets (20), in the region of the folding line (30), prior to collation.

Abstract: In the case of the method by which sheets which are printed, in particular, by a digital-printing machine are processed further to produce multi-leaf printed products, the printed sheets are folded at least once to form a folded sheet, and the folded sheets are collated one above the other. The sheets are folded prior to collation such that the folding edge of the folded sheet is located at the top and the folded sheet opens in the downward direction, with the result that the folded sheets can maintain their position prior to collation.

Abstract: In the case of the method of, and the folding machine for, folding a plurality of sheets (50) in a buckle folder (12) with at least a first and a second buckle plate (30, 34, 70), in which a respective first sheet stop (32) and a second sheet stop (36, 72) are provided and between which at least one pair (41) of folding rollers, with folding rollers (40, 42) rotating in opposite directions, is arranged, the sheets (50) are transported one after the other into the first buckle plate (30) until they strike against the corresponding sheet stop (32), in which case they are collected in the first buckle plate (30) to form a group (51) of sheets.

Abstract: In the method for further processing sheets printed in particular by a digital press for the production of multi-sheet printed products, the printed sheets are folded at least once by at least one folder to form a folded sheet and the folded sheets are collated one above another in a gathering device. The sheets are provided with detection features to be detected by a detection device and the detection device passes on signals corresponding to the detection features to a central control device, which controls at least one folder and/or the gathering device in accordance with the detection features.

Abstract: The folding machine includes at least one pair of knife shafts, the knife shafts (22, 24) of which are, in a working position, mounted parallel to each other between two spaced-apart side walls (18, 20) of the folding machine (10). In order, in parallel with the production process, to be able to prepare knife shafts for a subsequent production process, the knife shafts (22, 24) are mounted in a cassette (28) which can be displaced through a sidewall (20) facing the operator from an inserted position, in which the knife shafts (22, 24) are in their working position, into a pull-out position, in which the knife shafts (22, 24) are outside the folding machine (10).

Abstract: In the process for folding a sheet into a folded sheet with a minimum of 16 pages (sides), a first folded sheet (12) with four pages is formed by virtue of the sheet (11) being folded around a folding line (21) running transversely to the feeding transporting direction (30). Continuing in the feeding transporting direction, the second and third folded sheets are formed by virtue of being folded around corresponding lines running along the feeding transporting direction. The third folded sheet (14) can then be deflected through 90° and, thereafter, folded, around its center line (22a, 22b) running longitudinally in relation to the continued-transporting direction (31), into a fourth folded sheet with 32 pages. This process makes it possible to achieve very high sheet-processing speeds.

Abstract: In the case of the method of setting the folding-nip width of a plurality of pairs of folding rollers which are provided on a folding machine, the two folding rollers (12 to 22) of the pairs of folding rollers are brought into contact with one another. A sheet is then guided through between the two folding rollers (12 to 22) of the pairs of folding rollers, as a result of which at least one of the two folding rollers (12 to 22) moves in relation to the other, with a folding nip being formed in the process, it being the case that, for each pair of folding rollers, a measured value corresponding to the folding-nip width is detected as the sheet is guided through. Finally, the folding-nip widths of the individual pairs of folding rollers are set by adjustment of the at least one moveable folding roller (14 to 22) by means of a drive (42), which is connected kinematically thereto, based on the corresponding measured values which have been detected.

Abstract: A buckle-folding unit for a folding machine has at least one buckle plate (10) including a plurality of plate-bar structures (12) which are spaced apart one beside the other in a single plane, each of the plate-bar structures (12) including two plate bars (14, 16) spaced apart from one another to form a gap (18) therebetween, the gaps (18) being located in a single plane. The plate bars (14, 16) have an inner recess (33) in the side thereof which is directed toward the gap (18). A sheet-stopping device (22), which can be displaced in the longitudinal direction of the plate-bar structures (12), is arranged transversely to the plate-bar structures (12) and passes through the gaps (18) of the plate-bar structures (12).