Cutting mechanism for a document shredder
AssigneeSchleicher & Co. International Aktiengesellschaft
InventorsHartmut Stangenberg, Rolf Gasteier
Life of this patent
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Abstract
A cutting mechanism (11) for torsion cut has two cutting rollers (12, 13), cutting disks (14, 15), which in each case have a steep cutting face (22) and a sloping back face (23). The transitions between the latter and the roller body are generously filleted and the ratios between the cutting disk spacing, height, etc. are such that the opening (29) for the cut strips (28) has a compact and well rounded shape, so that the strips do not tend to get caught.
Claims26
A cutting mechanism for a document shredder with two cutting rollers rotatable around axes, which have cutting disks arranged with an axial spacing from one another and projecting from the roller surface, each of said cutting disks comprising a substantially radial cutting face terminating in a continuous circumferential cutting edge and a bevelled back face, each cutting edge of a cutting disk of one of said cutting rollers overlapping an oppositely directed cutting edge of a cutting disk of the other of said cutting rollers and cooperating therewith for cutting a flat material introduced between the cutting rollers into strips;
- a passage for each of said strips being bounded by the cutting face and the back face of adjacent cutting disks and the roller surfaces of both cutting rollers, said passage having a compact shape wherein a first perpendicular distance between opposing back faces and a second perpendicular distance between centers of the roller surfaces being approximately equal.
A cutting mechanism according to any one of the preceding claims, wherein the transitions between the roller surface and the back face and the cutting face are provided with fillets.
Dependencies are inferred from the claim text.