Sheet hinge forming apparatus

Details Sheet hinge forming apparatus Sheet hinge forming apparatus

1984-03-02

1986-03-18

Braun, Fred L.

Photocopying

Including fiber optics

355 3SH, 428153, 428192, 493324, 493424, G03G 2100

Patent

active

045764611

ABSTRACT:
An apparatus in which a hinge is formed in successive sheets to permit the sheets to lay substantially flat after being opened when bound to one another in a booklet. The stiffness of successive advancing sheets in a marginal region along a line substantially parallel to an edge of the sheet is reduced to facilitate bending of the sheet. The line of reduced stiffness for successive sheets is offset from one another so as to enable bending of the sheets therealong permitting the open sheets of a booklet of sheets to lay substantially flat.

REFERENCES:
patent: 2168896 (1939-08-01), Asnes
patent: 3687539 (1972-08-01), Furuichi
patent: 4051285 (1977-09-01), Kramer
patent: 4134672 (1979-01-01), Burlew et al.
patent: 4408861 (1983-10-01), Hukuda et al.
patent: 4522542 (1985-06-01), Minor

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