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INTELLIGENT PART VERIFICATION SYSTEM FOR SURFACE MOUNT PLACEMENT MACHINES

IP.com Disclosure Number: IPCOM000008612D
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jun-26
Document File: 2 page(s) / 87K

Publishing Venue

Motorola

Related People

Harsh D. Kohli: AUTHOR

Abstract

Surface mount placement machines require the correct part be placed at each feeder for a board to be correctly assembled. Parts typically come on reels that are placed on the feeder by a human being. The wrong reel may be placed on the feeder because the human misreads the part number, the feeders may be swapped before being placed on the machine, the supplier of the reel mislabeled the reel, or an incorrect bar code was placed on the reel at Motorola. As a result, boards with incorrect parts must be either scrapped completely or washed off and reworked if caught before the reflow process. This invention attempts to address all these problems.

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MOTOROLA Technical Developments

INTELLIGENT PART VERIFICATION SYSTEM FOR SURFACE MOUNT PLACEMENT MACHINES

by Harsh D. Kohli

PROBLEM SOLVED BY THE INVENTION

  Surface mount placement machines require the correct part be placed at each feeder for a board to be correctly assembled. Parts typically come on reels that are placed on the feeder by a human being. The wrong reel may be placed on the feeder because the human misreads the part number, the feeders may be swapped before being placed on the machine, the supplier of the reel mislabeled the reel, or an incorrect bar code was placed on the reel at Motorola. As a result, boards with incorrect parts must be either scrapped completely or washed off and reworked if caught before the reflow process. This invention attempts to address all these problems.

  There has been prior work done in this area like a bar code verification system that ties a particular feeder to a particular location on the machine. This system also ties the part to the feeder. The system is not foolproof, because the operator can accidentally scan a part and a feeder and swap them, giving a false match. This system will not catch any parts not correctly labeled by a supplier or an incorrect bar code was placed on the reel at Motorola.

DESCRIPTION OF THE INVENTION

The present invention proposes looking at each

part before it is placed. A part marking is placed on

the top and bottom of each part. When a part is picked up, before it is placed, the part is passed over the existing camera for part recognition based on the part marking, which needs to be unique for each different part. The machine is programmed to expect a parti...