Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
A matrix print head including a common magnetic yoke plate, magnetic pole defining cores annularly arranged on said yoke plate, electromagnetic coils mounted on said cores, a common permanent magnet plate arranged in magnetic conductive relationship to said yoke plate; said yoke plate, said cores, said coils, and said permanent magnet plate establishing an electromagnetic assembly, there being additionally a common annular armature assembly including an armature plate and a plurality of deflectable radially extending armature arms, said armature assembly arranged in relation to the electromagnetic assembly such that the armature arms cooperate with said electromagnetic cores, there being print elements connected to said armature arms the improvement comprising: said armature plate being an annulus that extends around a common center, and said radially extending armature arms being physically separated from the armature plate in radial direction but being resiliently interconnected to establish a single uncritical parasitic radial air gap; and said magnetic yoke plate and said armature plate being radially, inwardly recessed vis-a-vis said permanent magnet plate, so that the permanent magnet plate has a larger radial outward extension through said yoke plate and said armature plate.
Claim 2
Dependent Claim
188 words
A matrix print head including a common magnetic yoke plate, magnetic pole defining cores annularly arranged on said yoke plate, electromagnetic coils mounted on said cores, a common permanent magnet plate arranged in magnetic conductive relationship to said yoke plate; said yoke plate, said cores, said coils, and said permanent magnet plate establishing an electromagnetic assembly, there being additionally a common annular armature assembly including an armature plate and a plurality of deflectable radially extending armature arms, said armature assembly arranged in relation to the electromagnetic assembly such that the armature arms cooperate with said electromagnetic cores, there being print elements connected to said armature arms the improvement comprising: said armature plate being an annulus that extends around a common center, and said radially extending armature arms being physically separated from the armature plate in radial direction but being resiliently interconnected to establish a single uncritical parasitic radial air gap; and said magnetic yoke plate and said armature plate being radially, inwardly recessed vis-a-vis said permanent magnet plate, so that the permanent magnet plate has a larger radial outward extension through said yoke plate and said armature plate.
Claim 3
Dependent Claim
28 words
The improvement as in claim 1 including an intermediate plate interposed between said yoke plate and said armature plate, said intermediate plate coplanar interfacing with said armature plate.
Claim 4
Dependent Claim
32 words
The improvement as in claim 2 said intermediate plate being likewise radially, recessed in relation to said permanent magnet plate, at least along one of the following, radial inside and radial outside.
Claim 5
Dependent Claim
28 words
The improvement as in claim 2 there being a relatively short resilient arm provided between each of said armature arms and said armature plate having a radial step.
Claim 6
Dependent Claim
35 words
The improvement as in claim 1 there being a two-part housing, a first one of the housing part containing essentially said electromagnetic coil assembly, the other part of the housing containing essentially said armature assembly.
Claim 7
Dependent Claim
35 words
The improvement as in claim 1 wherein said yoke plate is annular having a central opening being essentially closed by means of an electrical printed circuit board including electrical conductors connected to said electromagnetic coils.