Robert N Wiley

US Patent:

43576133, Nov 2, 1982

Filed:

May 15, 1980

Appl. No.:

6/150130

Inventors:

Robert A. Wiley - Richardson TX
Theodore F. Williams - Union OH
James W. Davis - Richardson TX

Assignee:

The Mead Corporation - Dayton OH

International Classification:

G01D 1518

US Classification:

346 75

Abstract:

An ink jet printer includes a charge decoupling device which permits fluid flow of electrically conductive fluid between a high voltage electrode and a grounded fluid reservoir while presenting a high impedance electrical path therebetween. The charge decoupling arrangement includes a nonconductive casing defining an interior casing cavity which is separated into an upper and a lower portion by means of a perforated plate extending horizontally across the cavity. A plurality of drop stabilizers are mounted adjacent associated ones of the perforations to define downwardly extending capillary fluid paths from the perforations into the lower portion of the cavity to form fluid drops which drip off of the bottoms of the stabilizers. The break up of the fluid into drops provides the high impedance path through the charge decoupling device, thus ensuring that the deflection electrode arrangement and the catchers are substantially electrically isolated.

US Patent:

43463886, Aug 24, 1982

Filed:

Jun 13, 1980

Appl. No.:

6/159016

Inventors:

Robert A. Wiley - Richardson TX

Assignee:

The Mead Corporation - Dayton OH

International Classification:

G01D 1518

US Classification:

346 75

Abstract:

A fluid supply system for an ink jet print head includes a recirculating path through a fluid pump, an inertial filter, and a variable restriction valve. Filtrate effluent from the inertial filter passes from the recirculating fluid path through a fixed restriction to the fluid supply line for the print head. The pressure drop across the fixed restriction is monitored and is utilized to control adjustment of the variable restriction valve in the recirculating fluid path such that the flow rate to the print head supply line is held constant. By this arrangement, the fluid within the print head may be maintained at a constant pressure level without the need for a pressure monitoring device directly associated with the print head.