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Wire Matrix Printhead Driver Short Detect System

IP.com Disclosure Number: IPCOM000037429D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hardin, KB: AUTHOR [+2]

Abstract

Disclosed is a minimal hardware system that detects opens or shorts of devices included in the head driver system. Figure 1 shows two possible driver implementations (Common Upper (1) and Individual Upper (2)) for which the technique can be applied. The topology consists of electronic switches (S1-S10) that source (3) / sink (4) curre to the printhead coils (5). By using reference sources V1 (6), V2 (7) and V3 (8) along with two voltage magnitude comparators (9, 10), it can be determined if any source (3) / sink (4) device has failed such that it would damage the print head. The criterion for determining a failure mode is when Vout (11) is greater that V2 (7) or less that V3 (8). If this occurs, then all remaining switches (S1-S10) should be turned off and the device failure reported.

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Wire Matrix Printhead Driver Short Detect System

Disclosed is a minimal hardware system that detects opens or shorts of devices included in the head driver system. Figure 1 shows two possible driver implementations (Common Upper (1) and Individual Upper (2)) for which the technique can be applied. The topology consists of electronic switches (S1-S10) that source (3) / sink (4) curre to the printhead coils (5). By using reference sources V1 (6), V2 (7) and V3 (8) along with two voltage magnitude comparators (9, 10), it can be determined if any source (3) / sink (4) device has failed such that it would damage the print head. The criterion for determining a failure mode is when Vout (11) is greater that V2 (7) or less that V3 (8). If this occurs, then all remaining switches (S1-S10) should be turned off and the device failure reported.

This system can determine when any source/sink switch fails such that it would damage the print head. Failure analysis is improved due to the ability to isolate source/sink switches that fail to close or open circuits in the head driver system.

Disclosed anonymously.

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