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Line printer with reduced magnetic permeance

Image Number 5 for United States Patent #6000330.

An impact printer and method of printing having a plurality of hammers in side-by-side relationship with pairs of pole pieces in associated relationship with each hammer with a hammer contact end and a distal end removed from the hammer contact. A pair of elongated magnets span the pole pieces at their distal ends and a magnet connection connects the magnets for creating a magnetic circuit through the pole pieces. The pole pieces have reduced adjacent facing areas at their distal ends, and are reduced in cross-section intermediately between their ends. The reduction in area between pole pieces directly reduces the permeance and mutual induction thereby creating greater accuracy of printing by the hammers.

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