Apparatus for perforating paper webs and the like

Details Apparatus for perforating paper webs and the like Apparatus for perforating paper webs and the like

1986-05-15

1987-06-23

Meister, James M.

Cutting

Cutting motion of tool has component in direction of moving...

Orbital motion of cutting blade

83346, 83347, 83561, B26F 108

Patent

active

046743774

ABSTRACT:
A perforating apparatus wherein two rolls define a nip for a running web of paper which is provided with rows of transverse perforations by tools at the periphery of one of the rolls. The rolls are driven in opposite directions by a timing shaft through the medium of a system of gears including an intermediate gear which indirectly drives the one roll and is directly or indirectly mounted on an eccentric. The eccentric is driven by a power train including a differential one output shaft of which carries the eccentric and another output shaft of which is normally held against rotation but can be turned by a worm to thereby change the phase of the one output shaft relative to the input shaft of the differential to thus compensate for eventual inaccuracies in the distribution of perforating tools at the periphery of the one roll. The input shaft of the differential is driven by a second system of gears, and the rolls are driven in such a way that they rotate through identical angles during each cycle of the apparatus.

REFERENCES:
patent: 4063493 (1977-12-01), McEvers et al.

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