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US 5,447,381 AGranted
Piezoelectric printing head
AssigneeFujitsu Limited
InventorsDaisuke Kimura, Yuji Oshime, Syuichi Yamaki
Life of this patent
Estimating the term…
Abstract
A piezoelectric printing head includes an annular base frame and a plurality of piezoelectric actuator assemblies mounted on the base frame. Each actuator assembly includes a piezoelectric element having one end rigidly secured to the base frame and another free end, an armature having a base end and a tip end to which a printing wire is rigidly connected, and a magnifying mechanism. When the piezoelectric element is electrically energized, a displacement of the piezoelectric element is magnified and then transmitted to the printing wire. Between the base frame and the base end of the armature there is provided a vibration damping buffer member.
Claims22
A piezoelectric printing head comprising:
- a base frame;
- a plurality of piezoelectric actuator assemblies mounted on said base frame, each actuator assembly comprising:
- a piezoelectric element having one end rigidly secured to said base frame and another free end;
- an armature having a base end portion and a tip end to which a printing wire is rigidly connected;
- a magnifying mechanism including a support spring for connecting said base frame to said base end portion of said armature at a first position and a movable spring, arranged substantially in parallel to said support spring, for connecting said free end of said piezoelectric element to said base end portion of said armature at a second position adjacent to said first position, so that, when said piezoelectric element is electrically energized, a displacement of said piezoelectric element is magnified to be transmitted to said printing wire;
- and
- a vibration damping buffer member disposed between a vertical portion of said base frame and said base end portion of said armature, wherein the space between said support spring and said movable spring is free of said buffer member, and said buffer member is a gel.
4 more elements
A piezoelectric printing head comprising:
- a base frame;
- a plurality of piezoelectric actuator assemblies mounted on said base frame, each actuator assembly comprising:
- a piezoelectric element having one end rigidly secured to said base frame and another free end;
- an armature having a base end portion and a tip end to which a printing wire is rigidly connected;
- a magnifying mechanism comprising at least means for connecting said free end of the piezoelectric element to said base end portion of the armature, so that, when said piezoelectric element is electrically energized, a displacement of said piezoelectric element is magnified to be transmitted to said printing wire;
- and
- a vibration damping buffer member disposed between a vertical portion of said base frame and said base end portion of said armature, wherein the space between said support spring and said movable spring is free of said buffer member, and said buffer member is a gel.
4 more elements
A piezoelectric printing head comprising:
- a base frame;
- a plurality of piezoelectric actuator assemblies mounted on said base frame, each actuator assembly comprising:
- a piezoelectric element having one end connected to said base frame and another free end;
- an armature having a base end portion and a tip end to which a printing wire is rigid connected;
- a magnifying mechanism comprising at least means for connecting said free end of the piezoelectric element to said base end portion of the armature, so that, when said piezoelectric element is electrically energized, a displacement of said piezoelectric element is magnified to be transmitted to said printing wire;
- said one end of the piezoelectric element having a block which is connected to said base frame by means of a connecting member comprising an adjustable screw so as to give a prestress to said piezoelectric element;
- an adhesive agent for adhering said connecting member to said block of the piezoelectric element;
- and
- wherein one of said block and said connecting member has a cut-out portion and the other has a protruding portion which is engaged with said cut-out portion, and said adhesive agent is filled in a gap between said protruding portion and said cut-out portion.
6 more elements
A piezoelectric printing head comprising:
- a base frame;
- a plurality of piezoelectric actuator assemblies mounted on said base frame, each actuator assembly comprising:
- a piezoelectric element having one end connected to said base frame and another free end;
- an armature having a base end portion and a tip end to which a printing wire is rigidly connected;
- a magnifying mechanism comprising at least means for connecting said free end of the piezoelectric element to said base end portion of the armature, so that, when said piezoelectric element is electrically energized, a displacement of said piezoelectric element is magnified to be transmitted to said printing wire;
- said one end of the piezoelectric element having a block which is connected to said base frame by means of a connecting member comprising an adjustable screw so as to give a prestress to said piezoelectric element;
- an adhesive agent for adhering said connecting member to said block of the piezoelectric element;
- and
- a releasing member provided on said base frame over at least a region opposite to said block, in such a manner that an attachment of the adhesive agent to said base frame is prevented.
6 more elements
A piezoelectric printing head comprising:
- a base frame;
- a plurality of piezoelectric actuator assemblies mounted on said base frame, each actuator assembly comprising:
- a piezoelectric element having one end connected to said base frame and another free end;
- an armature;
- a beam having a base end rigidly connected to said armature and a tip end to which a printing wire is rigidly connected;
- a magnifying mechanism comprising at least means for connecting said free end of the piezoelectric element to said armature, so that, when said piezoelectric element is electrically energized, a displacement of said piezoelectric element is magnified to be transmitted to said printing wire;
- said armature and said beam having respective connecting portions connected to each other, said connecting portion of said armature having a groove extending in a moving direction of said beam and said connecting portion of said beam being inserted into and rigidly engaged with said groove;
- a width of said connecting portion of said beam in the moving direction is larger than a width of said connecting portion of the armature in the moving direction, wherein both ends of the connecting portion of said beam protrude upward and downward, respectively, from the connecting portion of said armature.
5 more elements
A piezoelectric printing head comprising:
- a base frame;
- and
- a plurality of piezoelectric actuator assemblies mounted on said base frame, each actuator assembly comprising:
- a printing wire,
- a piezoelectric element having a first end rigidly secured to said base frame and a second end which is free,
- an armature having a base end portion, and a tip end portion rigidly connected to said printing wire,
- a magnifying mechanism including a support spring connecting said base frame to said base end portion of said armature at a first position of said base end portion, and a movable spring, arranged substantially in parallel to said support spring and creating a gap with said first support spring, for connecting said second end of said piezoelectric element to said base end portion of said armature at a second position adjacent to said first position, wherein said magnifying mechanism magnifies a displacement of said piezoelectric element and transmits the magnified displacement to said printing wire, and
- vibration damping means disposed between said base end portion of said armature and said base frame, wherein said gap is free of said vibration damping means.
5 more elements
Dependencies are inferred from the claim text.