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Blanking Press for Printed Circuit Card Production

IP.com Disclosure Number: IPCOM000043649D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Booth, G: AUTHOR [+3]

Abstract

A blanking press for punching out individual printed circuit cards from an oversize board or biscuit is adapted to replace them into the holes from which they came, maintaining the cards original alignment, and utilizing the interference between the card and the biscuit to hold them in place. Instead of processing cards held in specially designed jig plates, one for each size of card, the cards can now be processed while held in the biscuit from which they were punched. Since all the biscuits are the same size, only one size of jig is required, and existing tool holes and notch locations on the biscuit, which are much larger than the alignment holes on an individual printed circuit card, can be used for registration. A section through a multiple card blanking tool is shown in the figure.

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Blanking Press for Printed Circuit Card Production

A blanking press for punching out individual printed circuit cards from an oversize board or biscuit is adapted to replace them into the holes from which they came, maintaining the cards original alignment, and utilizing the interference between the card and the biscuit to hold them in place. Instead of processing cards held in specially designed jig plates, one for each size of card, the cards can now be processed while held in the biscuit from which they were punched. Since all the biscuits are the same size, only one size of jig is required, and existing tool holes and notch locations on the biscuit, which are much larger than the alignment holes on an individual printed circuit card, can be used for registration. A section through a multiple card blanking tool is shown in the figure. The bed 1 of the tool carries a number of dies 2 on which a biscuit (not shown) to be cut is supported. Pins 3 projecting from the edges of the dies locate tool holes in the biscuit and ensure accurate registration. In the figure, the two die plates are assumed to be rectangular, and of the same size. However, they may well be of shapes other than rectangular and may be of differing sizes. Vertically above the die plates, and carried by a power-driven slider 4, are punches 5 of complementary shape to the dies. The interference fit between card and biscuit is achieved by virtue of an almost zero clearance between punch and die. He...