Device for adjusting the phase of perforating devices as a function of the folding mode

A folder having a device for perforating material webs, the device comprising:

• a pair of perforating cylinders defining a perforation nip therebetween for passage of the material webs through said perforating nip, one of said perforating cylinders being adjustable in relation to said perforating nip relative to the other of said perforating cylinders;
• perforating tools capable of producing perforations on copies in an exactly correct position with respect to cross-folds formed in the copies, the perforation position being adjustable during machine operation;
• perforating strips said perforating tools being cooperatively related with respective one of said perforating strips for producing transverse or cross-perforations and being adjustable in the correct position relative to the cross-folds;
• at least one bridge-shaped perforating bar exteriorly straddling a respective one of said perforating cylinders, said at least one bridge-shaped perforating bar adjustably fixed to an axis of said respective one of said perforating cylinders, some of said perforating tools and said perforating strips being accommodated on said at least one perforating bar, others of said perforating tools and said perforating strips being accommodated directly on said cylinders;
• and
• an adjusting unit for adjusting said at least one perforating bar relative to a periphery of said respective one of said perforating cylinders.

A pin-less folder having a device for perforating material webs, the device comprising:

• a pair of perforating cylinders defining a perforation nip therebetween for passage of the material webs through said perforating nip, one of said perforating cylinders being adjustable in relation to said perforating nip relative to the other of said perforating cylinders;
• perforating tools capable of producing perforations on copies in an exactly correct position with respect to cross-folds formed in the copies, the perforation position being adjustable during machine operation;
• perforating strips said perforating tools being cooperatively related with respective one of said perforating strips for producing transverse or cross-perforations and being adjustable in the correct position relative to the cross-folds;
• at least one bridge-shaped perforating bar exteriorly straddling a respective one of said perforating cylinders, said at least one bridge-shaped perforating bar adjustably fixed to an axis of said respective one of said perforating cylinders, some of said perforating tools and said perforating strips being accommodated on said at least one perforating bar, others of said perforating tools and said perforating strips being accommodated directly on said cylinders;
• and
• an adjusting unit for adjusting said at least one perforating bar relative to a periphery of said respective one of said perforating cylinders.