Method of making ink jet print head
AssigneeNCR Corporation
InventorsLeonhard Bader, Frank Giessner, Ernst Pechinger, Friedrich B. Rombach, Wilhelm Ruprich, Helmut Weber, Hermann Winter
Life of this patent
Estimating the term…
Abstract
A mold having a desired print head shape includes a cover in which a plurality of rods or ductile fibers are attached, the cover being positioned with the rods extending into the mold and to the side opposite the cover. A hardenable synthetic material is introduced through a hole in the cover and after hardening of the material to form the print head, the rods are withdrawn from the mold to leave bores or apertures in the print head which serve as passageways for the droplets of ink.
Claims13
A method of making an ink jet print head comprising the steps of:
- providing an open end mold having an inner shape corresponding to the print head to be cast,
- covering the open end of said mold with a member having an inclined inner portion and a plurality of apertures spaced therearound,
- inserting stud members having stem portions into said apertures to cause said stem portions to extend within said mold and terminate along a plane spaced from the bottom thereof, each of said stud members having a shape to form a cavity for receipt of an ink drive element,
- inserting pin members at an angle into the side of said mold to reach the lower portion of said stud members,
- filling the mold with hardenable casting material to form the print head,
- forming a plurality of nozzles by boring holes in an alignment perpendicular to said mold bottom plane and to the terminus of said stem portions for enabling ejection of droplets of ink from said print head, and
- removing the stud members and the pin members to provide cavities for insertion of said ink drive elements and to provide passageways for flow of ink therethrough.
A method of making a multiple nozzle ink jet print head of hardenable cast material comprising the steps of:
- providing a mold having a cavity of a form corresponding to the print head to be cast,
- covering the open end of said mold with a member having an overlapping rim for engaging with said mold and having an inclined inner portion with a plurality of apertures spaced therein, said member having an opening surrounded by the inclined portion for receiving the cast material,
- inserting plug members having stem portions into said apertures at an angle with respect to the inclined portion to cause said stem portions to extend toward the bottom of the mold and along a straight line of a plane spaced from the bottom thereof, each of said plug members having a shape to form a cavity for receipt of an ink drive element and a capillary cavity for receipt of ink therebelow,
- inserting pin members into the side of the mold to extend into the capillary cavities defined by the plug members,
- filling the mold with the hardenable casting material through the opening in the cover member,
- forming a plurality of nozzles by boring holes along said straight line perpendicular to said plane and to the bottom end of said stem portions for enabling ejection of droplets of ink, and
- removing the plug members and the pin members to provide passageways and capillary cavities for flow of ink, to provide cavities for insertion of the drive elements, and to provide channels for passage of ink to said ink nozzles.
Dependencies are inferred from the claim text.