Hammer assembly for printers
AssigneeSeiko Epson Corporation
InventorSatoshi Fujioka
Life of this patent
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Abstract
A plunger type electromagnetic hammer assembly for use with a printer including a hammer housing having a magnetic flux emitting surface. The hammer assembly includes a hammer slidably situated in the housing wherein the hammer includes a plunger portion having a first radius and a head portion having a second radius. The plunger portion and the head portion are coupled by a neck portion having a third radius, the third radius being less than the first radius and than the second radius. The plunger, neck and head portions are coaxially oriented. A biasing structure biases the hammer away from the platen. A magnetic flux on the magnetic flux emitting surface causes the hammer to slide toward the platen.
Claims7
A plunger type electromagnetic hammer assembly for impacting onto a platen in a printer comprising:
- a housing formed with a yoke having a central elongated opening, said opening having a magnetic flux emitting surface;
- coil means for generating magnetic flux inside the central elongated opening of the yoke;
- elongated hammer means formed with a plunger portion having a first cross-sectional dimension and an impact heat portion having a second cross-sectional dimension, said plunger portion and said head portion coupled by a neck portion having a third cross-sectional dimension, said third cross-sectional dimension being smaller than said first dimension and than said second dimension, said plunger, neck and head portions being coaxially oriented, the plunger, neck and head portions all being integrally constructed from the same electromagnetic material;
- and
- the distance between the magnetic flux emitting means for reducing flux leakage from said flux emitting surface to the neck portion, said last mentioned means comprising maintaining, said closest surface being directly
Dependencies are inferred from the claim text.