Printing head for wire-dot printer
AssigneeFujitsu Limited
InventorsShigeo Miura, Yuji Oshime
Life of this patent
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Abstract
A wire-dot printing head has a housing in which a plurality of actuator assemblies are accommodated to drive a plurality of wire elements. An annular hollow space is formed in a side wall of the housing surrounding the actuator assemblies, whereby noise and vibration produced during operation of the actuator assemblies can be effectively damped due to the formation of the annular hollow space. When an interior of the housing is partially charged with gel-like damping material for damping the noise and vibration, a hollow space is formed in the charged damping material, whereby the increase in the inertial mass of the printing head can be reduced.
Claims22
A wire-dot printing head, comprising:
- a housing having an interior, a first end and a second end;
- an actuator accommodated in the interior of said housing;
- a plurality of wire elements, extending into the interior of said housing, engaged and driven by said actuator;
- said housing comprising an inner peripheral side wall portion surrounding the interior of the housing and the actuator, an outer peripheral side wall portion surrounding the inner side wall portion and defining a hollow space therebetween and a first end wall at the first end of the housing, extending between the inner and outer peripheral sidewalls and closing the hollow space therebetween at the first end of the housing, the actuator being supported by the first end wall;
- a non-liquid phase type sound-absorbent material charged in the hollow space between the inner and outer peripheral side wall portions for damping noise and vibration produced during operation of said actuator means;
- and
- the interior of the housing and the hollow space being accessible at the second end of the housing for inserting therein, respectively, the actuator and the charge of non-liquid phase type sound-absorbent material.
A wire-dot printing head comprising:
- a housing;
- an actuator accommodated in said housing;
- a plurality of wire elements, extending into said housing, engaged and driven by said actuator;
- an interior of said housing being partially charged with a non-liquid phase type damping material for damping noise and vibration produced during operation of said actuator, and said charge of non-liquid phase type damping material having a hollow space therein, thereby to minimize an increase in an inertial mass of the printing head due to the charge of damping material.
A wire-dot printing head comprising:
- a housing having an interior and first and second ends;
- an actuator accommodated in the interior of said housing;
- a plurality of wire elements, extending into the interior of said housing, engaged and driven by said actuator;
- said housing comprising a peripheral sidewall defining first and second openings at the respective first and second ends of the housing and a first end wall at the first end of the housing extending inwardly therefrom and defining a corresponding opening of reduced size relative to the first opening and through which at least end portions of the plurality of wire elements are disposed, the actuator being supported by the first end wall;
- and
- an interior of said housing being partially charged with a non-liquid phase type damping material for damping noise and vibration produced during operation of said actuator, and said charge of non-liquid phase type damping material having a hollow space therein, thereby to minimize an increase in an inertial mass of the printing head due to the charge of damping material, the hollow space being centrally disposed within the housing interior at the second end of the housing and extending from the second end and toward the first end.
Dependencies are inferred from the claim text.