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Acoustical Diagnostic Analysis of Individual Print Wire Actuators

IP.com Disclosure Number: IPCOM000040288D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Whitehead, K: AUTHOR

Abstract

A microphone attached to the platen of an impact printer is used to sense the acoustical energy generated by the impact of each individual hammer, print wire, or element. A microphone is placed on the platen that supports the paper or other medium to be printed upon. The first time a print actuator is used, the action of the other actuators is suppressed, and the acoustical energy generated by the impact of the sole actuator against the print medium and platen is monitored by the microphone. The output signal from the microphone is compared to predetermined minimum and maximum sound output levels which have been defined to yield acceptable printing for a particular medium or project, without causing other problems, such as ribbon damage.

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Acoustical Diagnostic Analysis of Individual Print Wire Actuators

A microphone attached to the platen of an impact printer is used to sense the acoustical energy generated by the impact of each individual hammer, print wire, or element. A microphone is placed on the platen that supports the paper or other medium to be printed upon. The first time a print actuator is used, the action of the other actuators is suppressed, and the acoustical energy generated by the impact of the sole actuator against the print medium and platen is monitored by the microphone. The output signal from the microphone is compared to predetermined minimum and maximum sound output levels which have been defined to yield acceptable printing for a particular medium or project, without causing other problems, such as ribbon damage. The input energy to each individual print actuator is increased or decreased to compensate for any deviations from the acceptable acoustic energy levels. These adjustments may be made by the microcode programmed into the printer controller. This invention may be used to detect print wires that are clogged due to gummy ink deposits, slowed by excessive or insufficient wear-reducing lubricants, or that stick for other reasons. Secondly, the invention may also be used to vary the input energy to each actuator to match the impact of the printing element to the medium which is to be printed upon, its thickness, or the number of copies. Thirdly, the invention may be used...