US 6,776,545 B1 · Impact dot print head and a printer including the same

Abstract

In the impact dot print head of the present invention there is used an armature spacer having side yoke portions which extend away from cores of a yoke and confront armatures. With such an armature spacer, when a magnetic circuit is formed by a magnetic flux generated by a coil which circuit passes from the associated core in the yoke, then through to-be-attracted members and the armature spacer successively, and reaches the yoke, the magnetic flux generated by the coil is prevented from flowing directly from the core to the armature spacer without flowing through the armature, whereby it is made possible to form a satisfactory magnetic circuit which permits the magnetic flux generated by a coil to flow from the associated core to the armature spacer through the associated to-be-attracted members. Consequently, a decrease of an attracting force for attracting each armature to the associated core, which is caused by the generation of a magnetic flux, is prevented and hence it is possible to attain high printing speed and printing pressure.

Claims16

Dependent claims

An impact dot print head comprising:

a plurality of armatures each disposed so as to be pivotable within a pivotal plane and between a printing position and a stand-by position;
printing wires provided so as to move with pivotal motions of the armatures;
a yoke having cores with coils wound thereon respectively, the cores being arranged in opposition to the armatures respectively on the printing position side with respect to the armatures;
and
an armature spacer integrally provided with an abutting portion for abutment against the yoke and side yoke portions each positioned between adjacent said armatures, the side yoke portions extending in a direction away from the cores and so as to confront the armatures.

2 more elements

A printer comprising:

an impact dot print head including:
a plurality of armatures each disposed so as to be pivotable within a pivotal plane and between a printing position and a stand-by position;
printing wires provided so as to move with pivotal motions of the armatures;
a yoke having cores with coils wound thereon respectively, the cores being arranged in opposition to the armatures respectively on the printing position side with respect to the armatures;
and
an armature spacer integrally provided with an abutting portion for abutment against the yoke and side yoke portions each positioned between adjacent said armatures, the side yoke portions extending in a direction away from the cores and so as to confront the armatures;
a head drive mechanism for reciprocating the impact dot print head in a horizontal scanning direction;
a printing control means which causes, in accordance with printing data, the impact dot print head to be reciprocated by the head drive mechanism and which causes the armatures to pivot selectively;
and
a recording medium conveying mechanism which brings a recording medium into opposition to the impact dot print head in the reciprocative range of the impact dot print head and which conveys the recording medium in a vertical scanning direction orthogonal to the horizontal scanning direction in accordance with a printing control made by the printing control means.

7 more elements

Dependencies are inferred from the claim text.

Impact dot print head and a printer including the same

Life of this patent

Impact dot print head and a printer including the same

Life of this patent

Abstract

Claims16