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The print actuator device shown in the figure rotates about a ferro-magnetic shaft for application as a high-speed, low-mass print actuator.
English (United States)
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Rotary Actuator Design for Dot Matrix Impact Printer
The print actuator device shown in the figure rotates about a ferro-magnetic
shaft for application as a high-speed, low-mass print actuator.
Referring to the figure, the print actuator includes an annular rotating
armature 10 made of a self-lubricating polymer plastic or a polymer-coated, non-
magnetic metal, such as aluminum. Embedded in the actuator are two steel
inserts 12. The armature 10 is mounted for rotation on a shaft 14 made of a
ferro-magnetic material such as steel. The shaft acts as both a flux return path
and bearing for the rotating armature.
The inserts are initially positioned to be offset with respect to the stator 16
poleface. As the coil 18 is energized, the magnetic flux causes the inserts to
become aligned with the stator poleface, thereby creating a high-speed rotation
of the armature 10. The armature may be molded from lightweight plastic
material in order to provide a lower mass. The lever-arm advantage actuator
configuration is used to increase the speed and stroke of the actuator for high-
In a further modification additional inserts 12 can be embedded in the
actuator 16 for increasing the magnetic pull force on the actuator when the coil is