Browse Prior Art Database

ANTI SUCK BACK PICKUP TIP

IP.com Disclosure Number: IPCOM000006127D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Dec-06
Document File: 1 page(s) / 49K

Publishing Venue

Motorola

Related People

Ong Chuan Aik: AUTHOR [+3]

Abstract

The pickup tip is an essential unit in a pick and place assembly operation. The tip is attached to a robot arm and connected with a vacuum source. The nozzle of the pickup tip is spring loaded for the following reasons: 1. To ensure proper contact between the nozzle tip and the component being picked up by allowing a small amount of over-travel without damaging the nozzle or the component; and 2. To minimize the amount of impact acting on the component during the pick and place operation.

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MOTOROLA INC. Technical Developments Volume 12 April 1991

ANTI SUCK BACK PICKUP Tlti

by Ong Chuan Aik, Lim Fun Yoong and Bernaid Tee

  The pickup tip is an essential unit in a pick and place assembly operation. The tip is attached to a robot arm and connected with a vacuum source. The nozzle of the pickup tip is spring loaded for the following reasons:

  1. To ensure proper contact between the nozzle tip and the component being picked up by allowing a small amount of over-travel without damaging the nozzle or the component; and

2. To minimize the amount of impact acting on the component during the pick and place operation.

Prior art pickup tips, illustrated in FIG. 1, experience a nozzle suck back problem. That is, when

the vacuum builds up in the prior art pickup tip, the spring loaded nozzles is retracted by an amount proportional to the spring strength and the vacuum pressure. The amount of retraction can be up to 2 mm.

  After the vacuum ,is removed, the spring back action of the nozzle will cause an impact on the component. This impact can cause some component cracking or placement misalignment.

  In the present pickup tip, illustrated in FIG. 2, the vacuum inlet is moved ~from a point at the upper end of the moveable nozzle to a point midway between the ends of the moveable nozzle. This design separates the vacuum system and the spring system so that the vacuum suction will not retract the nozzle tip.

FIG,1

FIG,?

140

53 Motorola. 1°C. 1991

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