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Printhead Test Fixture

IP.com Disclosure Number: IPCOM000041068D
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Barenboim, M: AUTHOR [+5]

Abstract

A printhead fixture provided with sensors permits automated testing of print wire flight time, impact force and return time.

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Printhead Test Fixture

A printhead fixture provided with sensors permits automated testing of print wire flight time, impact force and return time.

The Figure shows printhead 1 clamped in the fixture and held between sensor 2 and sensor 3. The printhead circuit card 4 is clamped between edge connectors 5, completing input circuits to the print magnets. The fixture is mounted on slide 6 which is moveable in direction 7 by motor 8.

It is required to test missile (print wire) flight time and impact at two different distances between printhead and target. For the first test, motor 7 operates slide 6 moving printhead 1 to contact sensor 2, and then backs away a pre-determined distance. The print magnets are successively energized, by computer, firing the missiles against sensor 2 which registers the arrival time and impact force of each missile. The computer calculates the flight time, i.e., the interval between energization and impact. For the second test, printhead 1 is backed away from sensor 2 to a second pre-determined distance and the above procedure is repeated. For the last test, slide 6 is moved forward until sensor 3 is in contact with print magnet stator plate 9 through the hole in circuit card 4. The print magnets are again successively energized firing the missiles. When the missile returns to its normal position, the return impact is registered by sensor 3, and the computer calculates the return time.

Disclosed anonymously.

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