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THROW DISTANCE CONTROL DEVICE FOR AN INK JET RECIPROCATING CARRIAGE PRINTER

IP.com Disclosure Number: IPCOM000025281D
Original Publication Date: 1984-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 106K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a stiched, continuous stream type ink jet printer with a reciprocating carriage, one significant tolerance affecting spacing between droplets from adjacent nozzles as they impact the paper, is the throw distance. By throw distance, it is meant that distance between the nozzle and the paper. Several dimensional tolerances will vary the throw distance as the carriage traverses across the paper. For example, varying thickness of the paper, the varying platen diameter along its axis, the platen axis eccentricity as the platen rotates, etc.

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Page 1 of 2

(EROX DISCLOSURE JOURNAL

THROW DISTANCE CONTROL DEVICE FOR AN INK JET RECIPROCATING CARRIAGE PRINTER Int. C1. Gold 15/18 Chein-Hwa S. Tsao

Proposed Classification
U.S. Cl. 346/75

FIG. I

\

32

FIG. 2

Volume 9 Number 3 May/June 1984 189

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THROW DISTANCE CONTROL DEVICE FOR AN INK JET RECIPROCATING CARRIAGE PRINTER (Cont'd)

In a stiched, continuous stream type ink jet printer with a reciprocating carriage, one significant tolerance affecting spacing between droplets from adjacent nozzles as they impact the paper, is the throw distance. By throw distance, it is meant that distance between the nozzle and the paper. Several dimensional tolerances will vary the throw distance as the carriage traverses across the paper. For example, varying thickness of the paper, the varying platen diameter along its axis, the platen axis eccentricity as the platen rotates, etc.

Figure 1 shows a carriage 12 which traverses back and forth across the width of paper 14 on rods 16. The paper is in the form of a web and moves around circular platen 18. The carriage contains multiple ink jet nozzles with eject streams of ink that break up into streams of ink droplets 20. The droplets are charged at the point of breakoff from the streams according to information to be printed by means well known in the art. The charged droplets are deflected into a trajectory which will cause it to impact at a specific location on the paper by an electrostatic field produced by deflection electrodes as the droplets pass therethrough. The droplet...