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Low Cost Design and Method of Presenting Integrated Heat Spreaders in a Precisely Registered Mode for Assembly Automation and Shipping

IP.com Disclosure Number: IPCOM000008587D
Publication Date: 2002-Jun-25
Document File: 4 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for controlling the tray-to-tray, tray-to-component, and tray-to-equipment interfaces of thermoformed shipping trays. Benefits include improved registration while the component is presented to the automated process equipment.

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Low Cost Design and Method of Presenting Integrated Heat Spreaders in a Precisely Registered Mode for Assembly Automation and Shipping

Disclosed is a method for controlling the tray-to-tray, tray-to-component, and tray-to-equipment interfaces of thermoformed shipping trays. Benefits include improved registration while the component is presented to the automated process equipment.

Background

Currently, large clearances are incorporated between thermoformed trays to prevent trays from sticking together during automated handling. The horizontal presentation accuracy is +/- 0.010 inch to +/- 0.030 inch on the x and y axis, and up to 0.750 inch for the stack. Tray stack parallelism can have a range of  +/- 0.250 inch. Trays nest in the pocket features of components to control tray-to-tray pitch, which may result in component damage or significant foreign material generation. Tray-to-tray pitch varies between +/- 0.030 inch. Trays frequently stick together, causing component damage or loss, and machine downtime. Tray cost is typically $2.50 per tray.

General Description

The disclosed method moves the primary tray-to-tray registration features above the top plane of the tray body, and incorporates secondary features in the tray body to improve the control of tray stacking pitch, tray-to-tray horizontal float, and tray stack parallelism. The disclosed method prevents sticking and component damage associated with pocket and/or tray body nesting, while reducing cost.

The disclosed method contains three key features (see Figure 2):

§         Feature A—mating pitch and float control. This feature is integral to presentation accuracy. The number and exact locations of these paired and unpaired mating controls vary as the tray matrix (number of columns and rows of pockets) varies.

§         Feature B—zero draft walls with over draw and pedestal seating plane. This feature crea...