Matrix print head assembly
AssigneeHelmut Falk
InventorDonald G. Hebert
Life of this patent
Estimating the term…
Abstract
A wire matrix print head assembly in which armatures are mounted between pairs of magnetic pole members and wire printing members with coplanar radially spaced pole member end surfaces facing the direction of movement of the armatures and the wire printing members during printing movement from a non-print position to a print position and the pole member end surfaces providing a first radially innermost pivotal support means engageable with the armature members only during an initial portion of the armature movement and also providing a second radially outermost pivoted support means engageable with the armature members only during a terminal portion of the armature movement.
Claims18
A matrix print head assembly comprising:
- a number of wire stylus members spaced about a central longitudinal axis and being longitudinally movable between a non-print position and a print position;
- guide means for movably supporting said wire stylus members;
- a number of rigid armature members equal to the number of wire stylus members movable between a non-print position and a print position and extending radially outwardly of and being circumferentially spaced about the central longitudinal axis with a radially inner portion being driveably engageable with said wire stylus members during movement from the non-print position to the print position to drive the stylus members from the non-print position to the print position;
- a number of electromagnet means equal to the number of armature members mounted in juxtaposition to a radially outer portion of said armature members for pivotally supporting said armature members during movement from the non-print position to the print position and being selectively energizable for causing pivotal movement of the radially outer portion of said armature members toward said electromagnet means and opposite pivotal movement of the radially inner portion of said armature members away from said electromagnetic means during movement from the non-print position to the print position by magnetic force applied to the radially outer portion;
- said armature members being positioned between said electromagnet means and said wire stylus members and said radially innermost portion being movable away from said electromagnetic means toward said wire stylus members during movement from the non-print position to the print position;
- first pivotal support means for pivotally supporting said armature members during a first initial portion of the movement of said armature members from the non-print position to the print position;
- and
- second pivotal support means pivotally supporting said armature members during a second terminal portion of the movement of said armature members from the non-print position to the print position.
Dependencies are inferred from the claim text.