Browse Prior Art Database

INGESTION ORIFICE FOR AN INK JET DEVICE

IP.com Disclosure Number: IPCOM000025174D
Original Publication Date: 1983-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 60K

Publishing Venue

Xerox Disclosure Journal

Abstract

Startup and shutdown of an ink system in a Rayleigh synchronous ink jet printer presents a formidable task. A main limitation during shutdown is the creation of a negative pressure in the fluid system, thus drawing air in through one or more orifices and promoting subsequent failures. Air ingestion tends to occur in the one particular orifice offering the least resistance.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 85% of the total text.

Page 1 of 2

KEROX DISCLOSURE JOURNAL

INGESTION ORIFICE FOR AN INK JET DEVICE
Donald N. Kords

Proposed Classification
U.S. C1. 346/75 Int. CI. Gold 15/18

Startup and shutdown of an ink system in a Rayleigh synchronous ink jet printer presents a formidable task. A main limitation during shutdown is the creation of a negative pressure in the fluid system, thus drawing air in through one or more orifices and promoting subsequent failures. Air ingestion tends to occur in the one particular orifice offering the least resistance.

Use of an addition orifice of a diameter larger than the printing orifices will offer the least resistance and will prevent air ingestion by the printing orifies. Such an orifice would be designated to tolerate air ingestion easily expelled during startup. All air ingestion, if any, would occur here, preventing problems from occuring at the printing orifices. Thus, an orifice specifically for the ingestion of air will make the system tolerant of air ingestion during startup and shutdown.

The ingestion orifice would not necessarily be located near the printing orifices on the aperture plate. Also, the ink stream from the ingestion orifice may be guttered and recirculated immediately.

As the number of printing orifices is increased, flow loss through the ingestion orifice, as a percentage of total flow, is reduced.

With an air ingestion tolerant ink system, possible startup and shutdown failures may be reduced, thus reducing maintenance and downtime and impr...