Cross-cutting device for a folding unit

Abstract

The invention relates to a cross-cutting device 2 for a folding apparatus 1 for producing individual signatures from a printing material web. The invention is based on the object of creating a solution that makes it possible to ensure a precise severing of a printing material web 4 and a precise positioning of the signatures 3 using a cross-cutting device 2. This object is achieved in that the cross-cutting device 2 is equipped with a first transport device 5, wherein the first transport device 5 is configured such that belts 7 thereof can be driven at a first speed v1, wherein the first speed v1 corresponds to the web speed vb, with a first cutting device 8 arranged in the region of the first transport device 5, with a second transport device 6 arranged downstream of the first transport device 5 and designed as a belt guide system,wherein the second transport device 6 is arranged such that belts 7 thereof can be driven at a second speed v2, with a second cutting device 9 arranged in the region of the second transport device 6, and wherein each signature 3 downstream of the second cutting device 9 is picked up by an acceleration device 11 which can be driven at a third speed v3 and accelerated to the third speed v3.

Claims

[1] Cross-cutting device (2) for a folding device (1) for producing individual signatures (3) from a printing material web (4), with a first transport device (5) designed as a belt guide system for the printing material web (4), which runs into the cross-cutting device (2) at a web speed vb, wherein the first transport device (5) is arranged such that a plurality of belts (7) thereof can be driven at a first speed v1, wherein the first speed v1 corresponds to the web speed vb, with a first cutting device (8) arranged in the region of the first transport device (5), wherein the first cutting device (8) is arranged such that it cuts the printing material web (4) in those sections which are not covered by the belts (7) of the first transport device (5), with a second transport device (6) arranged downstream of the first transport device (5) and designed as a belt guide system, the belts (7) of which are offset transversely to the transport direction of the printing material web (4) to the belts (7) of the first transport device (5), wherein the second transport device (6) is arranged such that belts (7) thereof can be driven at a second speed v2, with a second cutting device (9) arranged in the region of the second transport device (6), wherein the second cutting device (9) is arranged such that, in order to separate signatures (3), it cuts through the printing material web (4) in those sections which are covered by the belts (7) of the first transport device (5), and wherein each signature (3) downstream of the second cutting device (9) is detected by an acceleration device (11) which can be driven at a third speed v3 and is accelerated to the third speed v3. [2] Cross-cutting device (2) according to claim 1, characterized by that the second speed v2 is equal to the path speed vb, and wherein the third speed v3 of the acceleration device (11) is greater than the path speed vb. [3] Cross-cutting device (2) according to claim 1, characterized by that the second speed v2 is greater than the path speed vb, and wherein the third speed v3 of the acceleration device (11) is greater than the path speed vb. [4] Cross-cutting device (2) according to claim 3, characterized by that the third speed v3 of the acceleration device (11) is equal to the second speed v2. [5] Cross-cutting device (2) according to one of claims 1 to 4, characterized by that the first cutting device (8) and the second cutting device (9) have a peripheral speed vs which corresponds to the web speed vb. [6] Cross-cutting device (2) according to one of claims 1 to 5, characterized by that the first cutting device (8) and the second cutting device (9) have a variable number of cutting blades (12) on a respective circumference. [7] Cross-cutting device (2) according to one of claims 1 to 6, characterized by that the acceleration device (11) is arranged so as to be variable in its distance a from the second cutting device (9). [8] Cross-cutting device (2) according to one of claims 1 to 7, characterized by that the distance a between the second cutting device (9) and the acceleration device (11) substantially corresponds to a signature length Ls. [9] Cross-cutting device (2) according to one of claims 1 to 8, characterized by that the acceleration device (11) is designed as an acceleration roller or as a pair of acceleration rollers or as an acceleration cam. [10] Cross-cutting device (2) according to claim 9, characterized by that a peripheral speed of the acceleration roller or the acceleration roller pair or the acceleration cam corresponds to the third speed v3. [11] Folding device (1) for folding and / or collecting and / or laying out signatures (3) separated from a printing material web (4), characterized by that the folding apparatus (1) comprises a cross-cutting device (2) according to one of claims 1 to 10. [12] Folding apparatus (1) according to claim 11, characterized by that the folding apparatus (1) comprises at least one receiving cylinder (13) designed as a gripper cylinder or as a puncture cylinder. [13] Folding apparatus (1) according to one of claims 11 to 12, characterized by that the receiving cylinder (13) has a peripheral speed vaz which corresponds to the third speed v3 of the acceleration device (11). [14] Folding apparatus (1) according to one of claims 11 to 13, characterized by that the receiving cylinder (13) comprises a device for forming a transverse fold. [15] Web-fed printing machine for printing a web of printing material (4), characterized by that the web-fed printing press comprises a folding apparatus (1) according to one of claims 11 to 14 and / or a cross-cutting device (2) according to one of claims 1 to 10.

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