Importance

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Abstract

A method for providing edge-side tracks of holes in 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 carrying printing forms or printing pictures is led, with one printing belt cylinder being provided with radial ring of pins in the region of each of its ends, wherein the pins mesh with holes of the edge-side tracks of holes of the printing belt. 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 operation. Said state of tension is maintained during the punching of the tracks of holes such that the punched holes maintain their circular 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 radial rings of pins. A machine frame for carrying out the method includes a clamp for holding the front end of the belt, stretching rollers for stretching the belt, a supply roller for feeding belt between stretching wheels, an upper shaft carrying a punch wheel at each end and a lower shaft carrying a die wheel at each end, sledge-like carriages mounted in tracks at each side of the frame to carry the punch and die wheels along the side-edge of the belt to punch the tracks of holes.

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First Claim