Method and apparatus for providing edge-side tracks of holes...

Details Method and apparatus for providing edge-side tracks of holes... Method and apparatus for providing edge-side tracks of holes...

B - Operations, Transporting

26

F

B26F 1/02 (2006.01) B41F 17/00 (2006.01)

Patent

CA 2042501

Abstract This invention refers to method for providing edge-side tracks of holes at a printing belt for a rotary printing machine with at least one counter pressure cylinder and at least two printing belt cylinders around which the continuous printing belt carry- ing printing forms or printing pictures is led, with one printing belt cylinder thereof being provided with a radial ring of pins in the region of each of its ends, wherein the pins thereof mesh with holes of the edge-side tracks of holes of the printing belt. For the solution of the problem to provide a method of this kind, according to which the edge-side perforations can be provided at a printing belt such that the punched holes maintain their ciruclar shape even in the stretched state of the printing belt in a printing machine and that the distance of the spacing of the holes of the tracks of holes exactly corresponds to the spacing of the pins of the tooth rows, prior to providing the edge-side tracks of holes, the printing belt is stretched with a tension corresponding to the tension with which the printing belt is led around the printing belt cylinders in printing opera- tion. Said state of tension is maintained during the punching of the tracks of holes. The invention furthermore refers to an appa- ratus for carrying out the method mentioned hereinbefore.

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