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GUTTER DESIGN FOR AN INK JET PRINTER

IP.com Disclosure Number: IPCOM000025432D
Original Publication Date: 1985-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 182K

Publishing Venue

Xerox Disclosure Journal

Abstract

Continuous stream-type ink jet printers have one or more ink streams emitted under pressure from nozzles of a drop generator which are directed towards a recording medium, such as paper. The pressurized ink is perturbed in the drop generator, so that the ink streams break up into droplets at fixed distances from the nozzles, whereat the individual droplets are charged in accordance with a voltage indicative of digitized data signals. The charged droplets pass through an electrostatic field produced by a pair of deflection plates for each ink stream to deflect the trajectory of each droplet to specific locations on the recording medium. Droplets not to be printed are directed to a gutter for collection and recirculation to the drop generator's ink supply. Generally, a voltage potential is applied to one of the deflection plates and the other is grounded.

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XEROX DISCLOSURE JOURNAL

GUTTER DESIGN FOR AN INK JET PRINTER
William R. Burger

Proposed Classification
U.S. CI. 346/75

Int. CI. Gold 15/18

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FIG. I

FIG. 2

Volume 10 Number 3 May/June 1985 129

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GUTTER DESIGN FOR AN INK JET PRINTER (Cont'd)

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  XEROX DISCLOSURE JOURNAL Volume 10 Number 3 May/June 1985

I30

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Page 3 of 4

GUTTER DESIGN FOR AN INK JET PRINTER (Cont'd)

Continuous stream-type ink jet printers have one or more ink streams emitted under pressure from nozzles of a drop generator which are directed towards a recording medium, such as paper. The pressurized ink is perturbed in the drop generator, so that the ink streams break up into droplets at fixed distances from the nozzles, whereat the individual droplets are charged in accordance with a voltage indicative of digitized data signals. The charged droplets pass through an electrostatic field produced by a pair of deflection plates for each ink stream to deflect the trajectory of each droplet to specific locations on the recording medium. Droplets not to be printed are directed to a gutter for collection and recirculation to the drop generator's ink supply. Generally, a voltage potential is applied to one of the deflection plates and the other is grounded.

In early continuous stream, ink jet printers, the gutters 10 were fabricated separately from the ground deflection plate 12 and mounted downstream thereof as shown by Figure 1, with the gutter shown in cross section. Arrow 11 indicates the direction of travel of the ink droplets. Sloped recesses 13 in the trail edge 15 of the deflection plate provide more clearance for the droplets directed to the gutter and reduce the number impacting the plate. Dashed line 14 indicates the path of travel by the guttered droplet.

Another gutter configuration is shown in side view in Figure 2, where a bifurcated end 25 of a gutter assembly 20 molded out of an insulative material, such as plastic, is inserted over the downstream or trail edge 24 of the grounded deflection plate 22. The gutter portion 21 protrudes from a generally flat portion 23 of the gutter assembly. The entry opening 26 in the gutter portion is preceded by a sloped recess 27 to provide more clearance for the droplets entering the gutter portion. Arrow 29 indicates the direction of travel of the ink droplets, and dashed line 28 indicates the path of travel by the guttered droplet.

Still another gutter configuration is shown in a side view by Figure 3, where separately mounted small finger gutter 30, shown in cross section, is positioned downstream of the grounded plate 32. Arrow 31 indicates the direction of travel of the ink droplets, and dashed line 34 indicates the path of travel of a guttered droplet. Sloped recess 33 in the trail edge 35 of the grounded plate provides more clearance for the droplets directed to the gutter 3...