Web printing machine with integrated torn paper cutter

Details Web printing machine with integrated torn paper cutter Web printing machine with integrated torn paper cutter

1985-12-26

1987-06-30

Fisher, J. Reed

Printing

Rolling contact machines

Rotary

B41F 1360

Patent

active

046761594

ABSTRACT:
To eliminate space requirements of an additional separating device to cut a torn web of paper in a rotary printing machine, a paper cutter is integrated into the circumference of a guide or transport roller (1) in the form of a knife (12) smoothly merging with the circumference (2) of the roller (1), but pivotable outwardly of the circumference (compare FIGS. 2 and 3) if a "torn paper" condition is sensed. In normal operation, a cam (6) rotates with the roller (1) being carried along, for example by friction, by a stub shaft (4). Upon sensing a "torn paper" condition, an electromagnet (20) pulls a latch (17) in engagement with a ratchet stop (16) on the cam, inhibiting rotation of the cam with the roller (1) and causing a cam follower (8) to rise on a land (7) of the cam, thereby pivoting the knife out of circumferential position with respect to the roller and severing the paper web (5).

REFERENCES:
patent: 837633 (1906-12-01), McAnulty
patent: 2125443 (1938-08-01), Helsel
patent: 2653536 (1953-09-01), Cooksey
Wochenblatt fur die Papierfabrikation 2, 1969, S.48=Weekly For Paper Manufacture, vol. 2, 1969, p. 48, Article by Dietrich Nebel.

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