Browse Prior Art Database

Standoff Attach Tool

IP.com Disclosure Number: IPCOM000036094D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Funk, SG: AUTHOR [+3]

Abstract

In the manufacture of integrated circuit modules, molded plastic standoffs are frequently placed on several selected module pins to maintain critical distance between the module and the printed circuit board during subsequent processing. Prior efforts at automating the standoff placement were stymied by the small protrusions on the standoffs. Such protrusions are often found on small injection molded plastic parts. The protrusions created difficulties in centering and seating the standoffs against a vacuum finger which was intended to collect the standoff from a bulk supply of standoffs and install the standoffs on a module pin.

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Standoff Attach Tool

In the manufacture of integrated circuit modules, molded plastic standoffs are frequently placed on several selected module pins to maintain critical distance between the module and the printed circuit board during subsequent processing. Prior efforts at automating the standoff placement were stymied by the small protrusions on the standoffs. Such protrusions are often found on small injection molded plastic parts. The protrusions created difficulties in centering and seating the standoffs against a vacuum finger which was intended to collect the standoff from a bulk supply of standoffs and install the standoffs on a module pin.

This article describes a four-point centering mechanism which allows high repeatability in the orientation of the standoffs to the vacuum finger. It also describes the operation of the tool which separates the standoffs from a bulk supply and installs them on selected pins on the circuit module.

The figure shows the apparatus in cross section. A number of vacuum fingers 10, equal to the number of standoffs needed per module, form the basis of the invention. The spacing of these fingers 10 is determined by the spacing of the module pins to which the standoffs are to be attached. Air cylinders 12 support an upper portion 26 above base 16. Hopper 14 is partially filled with standoffs 18 and the top of hopper 14 forms a module nest 20. To ensure proper standoff feed and positioning, the apparatus is mounted on a vibrator...