The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 11, 1979
Filed:
May. 01, 1978
Donald L Head, Kettering, OH (US);
Robert C Howard, Arcadia, CA (US);
The Mead Corporation, Dayton, OH (US);
Abstract
An ink jet printing device is provided of the type having a manifold (10) forming a liquid reservoir (11) with means (12) for supplying the reservoir (11) with liquid under pressure, a flexible orifice plate (13) forming one side of the reservoir (11) and containing a plurality of orifices (14) disposed in at least one row through which the printing liquid is expelled, means (18) for stimulating the orifice plate (13) to cause traveling wave vibrations there along so as to induce formation of uniform filaments and droplets from the orifice plate (13), means (15) for electrically charging selective ones of the droplets coming from the orifices (14) and further means (16) for catching the selectively charged droplets. A vibration damping means (21, 26, 32) is provided which engages an end portion or end portions of the orifice plate (13) beyond the end of the rows of orifices (14) for substantially completely damping out the traveling wave vibrations in the orifice plate (13) as they reach the end portions, with the damping means(21, 26, 32) having a V-shaped cross sectioned portions (22, 28, 36) in a plane parallel to the orifice plate (13) with the apex (23) of the V-shaped portion (22, 28, 36) extending towards the oncoming traveling waves. An alternative embodiment uses the damping means (21,26,32) in engagement with a pressure plate (40) which is liquid coupled to the orifice plate (13).