Browse Prior Art Database

Anti-Crash System for Flexpunch Machines

IP.com Disclosure Number: IPCOM000034917D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 5 page(s) / 102K

Publishing Venue

IBM

Related People

Seing, HS: AUTHOR [+2]

Abstract

A technique is described whereby a positioning system is used with a flexpunch machine to prevent green-sheet carrier tooling and punch and die tooling from crashing in the event of power, software or other malfunctions. A series of sensors and mechanical stops combined with interlocking circuitry provide flexpunch machines with anti-crash capabilities. Flexpunch machines, used for punching via hole patterns in multi-layer circuit green-sheet material typically consist of carrier assemblies, punch and die assemblies, as shown in Fig. 1, and positioning and verification devices controlled by computer software. The machines are designed to function automatically so as to move the green-sheets into position, punch the required holes and verify the (Image Omitted) success of the operation.

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Anti-Crash System for Flexpunch Machines

A technique is described whereby a positioning system is used with a flexpunch machine to prevent green-sheet carrier tooling and punch and die tooling from crashing in the event of power, software or other malfunctions. A series of sensors and mechanical stops combined with interlocking circuitry provide flexpunch machines with anti-crash capabilities. Flexpunch machines, used for punching via hole patterns in multi-layer circuit green-sheet material typically consist of carrier assemblies, punch and die assemblies, as shown in Fig. 1, and positioning and verification devices controlled by computer software. The machines are designed to function automatically so as to move the green-sheets into position, punch the required holes and verify the

(Image Omitted)

success of the operation. However, in the event of power failure, software or other malfunctions, the various elements of the carrier tooling and punch and die tooling could conceivably crash and cause damage to the tooling. Therefore, the concept described herein provides an anti-crash system to prevent crashing and potential damage to the equipment. The anti-crash system consisting of four basic elements - Sensor Masks; Position Sensors; Logic Circuitry; and Mechanical Stops. Three main staging areas are used to provide distinctive sensing areas; the X1 stage for the right side, X2 stage for the left side and the Y stage for the punch and die position, as shown in Fig. 1. The four elements function as follows: 1) Sensor Masks are strips of sheets metal attached to the

stationary base of the positioning devices. The masks

define five logical areas or positions in the movement of

the green-sheet though the process: Home position; Engage

area; Restricted area; Slow Scan area; and Fast Scan area.

2) Position Sensors are photo switches which are attached to

the underside of each carrier. Each carrier is fitted with

two sensor assemblies and each sensor assembly is an array

of photo switches mounted so that the emitters and

detectors straddle the sensor masks.

(Image Omitted)

3) Logic Circuitry is provided to interconnect the position

sensors and sensor masks with motors which control the

carriages carrying the green-sheets to the various

positions during the punch and verification operations. The

logic Circuitry allows the movement of the carriers as

follows:

1

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a. A carrier is allowed to leave its home position only

if another carrier is in its respective position.

b. The punch and die tooling carriage cannot leave its

position unless green-sheet carriers are at their

required positions.

c. Once a green-sheet carrier and the punch and die

carriage have been engaged for operation, neither may

leave the scan area unless to disengage and return to

its home position.

d. The punch and die carriage must disengage first and

will be prevented from doing so unless the green-sheet carrier is in the engage position. The green-sheet

carr...