Severing by tearing or breaking – Breaking or tearing apparatus – Work-parting pullers
Patent
1975-01-29
1976-12-28
Vlachos, Leonidas
Severing by tearing or breaking
Breaking or tearing apparatus
Work-parting pullers
225 97, 225106, B26F 300
Patent
active
039996948
ABSTRACT:
A method of severing useful lengths connected together by small fillets in a sheet of paper, pasteboard or the like, comprises applying the sheets on to a substantially non-flexible support having a contact surface of a first coefficient of friction, and then exerting on adjacent useful lengths, through forces which act in opposite directions tangentially on said adjacent useful lengths with a contact pressure by way of a second coefficient of friction exceeding the value of said first coefficient of friction, a splaying movement sufficient to destroy the fillets. Apparatus for carrying out the method may comprise a press, pressure fingers disposed at both sides of the longitudinal axis of said press, and contact surfaces having said comparatively high second coefficient of friction and at the free ends of said pressure fingers, said contact surfaces being intended for application to the useful lengths to be severed. The pressure fingers may be adapted to be moved away from one another in a plane substantially perpendicular to the principal plane of said useful lengths and the plane of separation between said useful lengths, a spring counteracting said movement of said pressure fingers as a function of downward movement of said press with increase of the spacing between the contact surfaces. Alternatively, there may be means for applying an additional and external force independent of the force applying the press to said useful lengths, said additional force being displaceable in a direction substantially tangential to the principal plane of said useful lengths.
REFERENCES:
patent: 2711793 (1955-06-01), Zalkind
patent: 3658220 (1972-04-01), Norton
patent: 3895751 (1975-07-01), Shepherd
Silverberg Fred A.
Vlachos Leonidas
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