Low friction hole punch element

B - Operations – Transporting – 26 – F

Patent

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Details

B26F 1/14 (2006.01) B26F 1/44 (2006.01)

Patent

CA 2619806

A hole punch device that reduces the force required to create a hole in papers or other sheet media. A punch element of the hole punch device includes a locally sloped or indented floor to create a bend in the sheet media as it is punched to create an enlarged, oval hole. The punch pin may include an expanding sleeve surround the pin that forms a larger diameter during the cutting stroke and springs back to a smaller diameter during a pull out stroke. A coiled torsion return spring is positioned remotely from and non- coaxially with the punch pin. A keyed pin and support frame arrangement ensures a predetermined rotational orientation of the pin for sequential cutting for reduced cutting force. The pin and/or other components optionally include electroless nickel plating to reduce friction and wear at the component or pin sliding and cutting surfaces.

La présente invention vise un dispositif perforateur exigeant moins de force pour réaliser un trou dans des papiers ou autres supports en feuilles. Un élément perforateur du dispositif perforateur comporte un fond localement incliné ou dentelé qui sert à créer une courbe dans le support en feuille lorsqu~il est perforé pour créer un trou ovale agrandi. La broche de perforation peut comporter une gaine extensible autour de la broche qui forme un diamètre plus grand pendant la course de coupe et qui revient à un diamètre plus petit pendant une course de remontée. Un ressort de retour à torsion en spirale est positionné à distance de la broche de perforation de façon non coaxiale à celle ci. Un agencement de broche à clavette et de cadre de support garantit une orientation rotative prédéterminée de la broche lors d~une découpe en série avec moins de force de coupe. La broche et/ou d~autres composants comportent facultativement un plaquage chimique « electroless » au nickel pour réduire la friction et l~usure au niveau des surfaces de glissement et de coupe sur les composants ou la broche.

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