Line printer with reduced magnetic permeance

Details Line printer with reduced magnetic permeance Line printer with reduced magnetic permeance

1998-09-25

1999-12-14

Bennett, Christopher A.

Printing

Selective or progressive

Bed and platen machines

4001242, B41J 2245

Patent

active

060003308

ABSTRACT:
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.

REFERENCES:
patent: 4882987 (1989-11-01), Sakai et al.
patent: 5344242 (1994-09-01), Farb
patent: 5743665 (1998-04-01), Ryan et al.

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