Mechanism for cutting single thickness paper or like sheet mater

Details Mechanism for cutting single thickness paper or like sheet mater Mechanism for cutting single thickness paper or like sheet mater

1983-12-09

1985-04-16

Schran, Donald R.

Cutting

With means to deform work temporarily

83582, 83584, 83694, B26D 130

Patent

active

045108412

ABSTRACT:
A paper shear mechanism consists of a guillotine having a fixed blade and a pivoted blade. The cutting edge of the fixed blade is concavely curved so that paper to be cut as fed between the blades assumes a corresponding curvature and is given some longitudinal rigidity during the cutting operation. The pivoted blade is of composite structure to simplify the manufacturing process and thus reduce cost. Essentially, it includes a cutting section stamped from flexible sheet steel shim to provide a cutting edge with the desired nip angle. The flexible steel section is spot welded to a mild steel backing member with an elongated spring member sandwiched between the two. The spring member has a number of spring teeth which exert a force along the length of the flexible section to deflect its cutting edge laterally towards the fixed blade. By this means contact between the cutting edges is maintained along the length of a cut and relief between the facing surfaces of the two blades is provided. A sheet feeding apparatus with a correspondingly curved cross-section to the fixed blade feeds paper web to the shear mechanism. A single motor serves to feed paper during forward rotation and to operate the paper shear during reverse rotation.

REFERENCES:
patent: 938741 (1909-11-01), Campbell
patent: 1565654 (1925-12-01), Laukhuff
patent: 1894379 (1933-01-01), Link
patent: 2382406 (1945-08-01), Engberg
patent: 3353432 (1967-11-01), Philippi
patent: 3757621 (1973-09-01), Breetvelt
patent: 3799022 (1974-03-01), Nagel et al.

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