Apparatus for stacking paper webs in zig-zag formations

Details Apparatus for stacking paper webs in zig-zag formations Apparatus for stacking paper webs in zig-zag formations

1989-02-10

1990-10-23

Look, Edward K.

Sheet-material associating

Associating and folding

Zigzag package

270 32, 493410, B41L 132

Patent

active

049646265

ABSTRACT:
A running web of computer paper is provided with transversely extending rows of perforations between successive coherent panels which are thereupon folded over each other in zig-zag formations to be converted into a series of stacks. When a stack exhibits a tendency to lean forwardly or backwards, as considered in the direction of advancement of the web, the web is stretched in the regions which are to be provided with perforations and the web is thereupon permitted to contract so that certain panels are slightly shorter than the remaining panels. This eliminates the tendency of the stacks to lean forwardly or backwards. In order to eliminate the tendency of stacks to lean in one direction, the web is stretched for the making of successive or selected oddly numbered rows of perforations, and the tendency of stacks to lean in the other direction is eliminated by stretching the web during the making of successive or selected evenly numbered rows of perforations. Signals which initiate stretching of the web (either by accelerating the web downstream of the perforating station and/or by altering the length of the path for the web upstream of the perforating station) can be generated by hand as a result of visual observation of growing stacks, or automatically in response to signals from one or more inclination monitoring devices.

REFERENCES:
patent: 4201102 (1980-05-01), Rudszinat
patent: 4255998 (1981-03-01), Rudszinat
patent: 4683704 (1987-08-01), Vorachek
patent: 4708332 (1987-11-01), Basemann

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