Browse Prior Art Database

Active Pin Straightener

IP.com Disclosure Number: IPCOM000034248D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 3 page(s) / 98K

Publishing Venue

IBM

Related People

DelPuerto, SE: AUTHOR [+4]

Abstract

This article concerns a device for straightening bent pins in pin grid array modules prior to electrical test or assembly of such modules on printed circuit (P/C) boards. (Image Omitted) Bent or damaged pins on a module must be straightened prior to module insertion into test site/sockets; otherwise, they will either destroy themselves or the receptacle holes. In normal practice, low volume product is visually inspected for bent pins and manually repaired prior to test insertion while high-volume low-cost product is automaticaly routed to a pin die employing counter-sunk holes that act to straighten slightly bent pins prior to module electrical test.

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Active Pin Straightener

This article concerns a device for straightening bent pins in pin grid array modules prior to electrical test or assembly of such modules on printed circuit (P/C) boards.

(Image Omitted)

Bent or damaged pins on a module must be straightened prior to module insertion into test site/sockets; otherwise, they will either destroy themselves or the receptacle holes. In normal practice, low volume product is visually inspected for bent pins and manually repaired prior to test insertion while high-volume low- cost product is automaticaly routed to a pin die employing counter-sunk holes that act to straighten slightly bent pins prior to module electrical test. Bent pins exceeding the "capture range" of the countersunk holes in the die are frequently destroyed (crushed or buckled) in this process, leading to excessive failures at electrical test. The disclosed device straightens bent pins by trapping them between the opposite corners of two identical grid plates, one aligned with and stacked atop the other, as shown in Fig. 1 (top view of grid plates). Fig. 2 illustrates the nature of the disclosed pin capture operation, wherein the top grid plate 1 (shown in black) is aligned with the bottom grid plate 2 (shown in white). A module pin 3 is shown as contained within the square enclosure formed by the two grid plates (Fig. 2A). Fig. 2B illustrates the pin 3 now forced into a nominal position between the diagonally opposed corners of the two plates. This action is explained in the c...