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IP.com Disclosure Number: IPCOM000006371D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2001-Dec-28
Document File: 1 page(s) / 54K

Publishing Venue

Motorola

Related People

Richard Fisher: AUTHOR [+4]

Abstract

Due to the nature of the paging business with new products being introduced frequently, the need for pro- duction line flexibility is increasing. To facilitate multi- product screen printing, a quick method for changing nest-plates has been developed, by using magnetic interaction.

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MOTOROLA INC. Technical Developments Volume 15 May 1992

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by Richard Fisher, Ovidiu Neiconi, Garth Mager and Daniel Yeaple

  Due to the nature of the paging business with new products being introduced frequently, the need for pro- duction line flexibility is increasing. To facilitate multi- product screen printing, a quick method for changing nest-plates has been developed, by using magnetic interaction.

  'EaditionaUy nest plates have been bolted to the print- ing table of a solder screen printer, which results in a cumbersome change over process when a new nest plate is to be used. This new nest plate requires no tools for changing and eliminates troublesome surface tension. The quick change stencil nest uses the existing vacuum system and tooling pins to locate the nest plate precisely and hold the nest plates without fasteners or tools. By placing magnets with a common polarity in both the nest-plate and printing table, the nest plate will be easily

released by magnetic repulsion, allowing the nest plate to be grasped when the vacuum is turned off.

  The tooling pins serve two purposes, to precisely locate the nest plate when the vacuum is on and to hold it in position when the vacuum is released. The location of the magnets is chosen to position the magnets symmetrically from both pins to maintain parallel air gap between the nest plates and printing table when the vacuum is turned off. The magnet size and strength is chosen to lii a 1....