Browse Prior Art Database

Jam Proof Device for Vapor Blast Machine

IP.com Disclosure Number: IPCOM000045040D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Aoude, FY: AUTHOR [+3]

Abstract

Printed circuit boards go through a vapor-blasting machine to remove shear and contamination after hole drilling. As shown in Fig. 1, the vapor-blasting machine comprises bottom conveyor rollers which are chain driven and top conveyor rollers which are free floating. The printed circuit boards are fed between the rollers and are vapor blasted by spray manifolds. Occasionally the boards get stuck between the conveyor rollers and get damaged from too much vapor blasting.

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Jam Proof Device for Vapor Blast Machine

Printed circuit boards go through a vapor-blasting machine to remove shear and contamination after hole drilling. As shown in Fig. 1, the vapor-blasting machine comprises bottom conveyor rollers which are chain driven and top conveyor rollers which are free floating. The printed circuit boards are fed between the rollers and are vapor blasted by spray manifolds. Occasionally the boards get stuck between the conveyor rollers and get damaged from too much vapor blasting.

As shown in Fig. 2, the above problem may be solved by locating eight evenly spaced metallic discs, which serve as sensors, on the free-floating rollers. These sensors will activate a proximity switch which resets a timer every 10 seconds to keep the machine running. If a circuit board gets jammed up in the conveyor, the free-floating rollers will not rotate to activate the proximity switch. As a result, within a maximum time of 10 seconds the machine will shut off. The operator then can clear the jam and continue the process, preventing the circuit boards from being scrapped.

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