Signature perforating knife and signature

Details Signature perforating knife and signature Signature perforating knife and signature

1988-09-13

1990-08-28

Bell, Paul A.

Books, strips, and leaves

Strips and leaves

83660, 281 211, 281 5, B42D 1300

Patent

active

049519670

ABSTRACT:
A signature formed as a plurality of layers of paper sheets and having a fold line is provided along the fold line with a line of spaced perforations. This line of perforations is formed by a signature perforating knife which has a plurality of spaced perforating teeth. The folded signature avoids creases and bulges during stacking of plural signatures.

REFERENCES:
patent: 2176815 (1939-10-01), Hirohashi
patent: 2343119 (1941-11-01), Zaslawsky
patent: 2700556 (1955-01-01), Holmwood
patent: 2775448 (1956-12-01), Baker et al.
patent: 2782056 (1957-02-01), Allegretti
patent: 3228710 (1966-01-01), Chodorowski
patent: 3343851 (1967-09-01), Bensler, Sr. et al.
patent: 3809410 (1974-05-01), Johnson et al.

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