Stock material or miscellaneous articles – Structurally defined web or sheet – Edge feature
Patent
1998-10-19
2000-09-05
Loney, Donald
Stock material or miscellaneous articles
Structurally defined web or sheet
Edge feature
428131, 360132, 242347, 206389, B32B 2302, G11B 2302
Patent
active
061140163
ABSTRACT:
A method for punching a template is provided comprising the steps of partially punching the template by applying a first punch to a first surface of the template to form a recessed portion thereof and by applying a first die to a second surface of the template to form a projected portion thereof, so as to produce a first shear plane connected with the first surface on a peripheral surface of the recessed portion and a second shear plane connected with the second surface on a peripheral surface of said projected portion; returning the projected portion so as to be substantially aligned with the recessed portion by holding the first surface and the second surface between a second punch and a second die; and fully punching the template by applying a third punch to the second surface and a third die to the first surface to as to produce a third shear plane connected with the second surface on a peripheral surface of the recessed portion and a fracture plane connected between the third shear plane and the first shear plane thereby causing a portion of the template to fully punched therefrom.
REFERENCES:
patent: 4097006 (1978-06-01), Saito
patent: 4651876 (1987-03-01), Tanuma et al.
patent: 5340528 (1994-08-01), Machida et al.
patent: 5372770 (1994-12-01), Machida
patent: 5585988 (1996-12-01), Kutsukake et al.
Kikuchi Shuichi
Sasaki Kazuo
Frommer William S.
Loney Donald
Ryan Matthew K.
Sony Corporation
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