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DROPLET SENSOR ARRAY WITH AN EXTRA NEUTRAL STREAM SENSOR

IP.com Disclosure Number: IPCOM000025331D
Original Publication Date: 1984-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 99K

Publishing Venue

Xerox Disclosure Journal

Abstract

In continuous stream, pagewidth printing from an array of fixed nozzles positioned transverse to the direction of the movement of paper, each nozzle produces a stream of ink. The ink from the nozzles is under a predetermined pressure and perturbated at a predetermined frequency, so that the streams break up into droplets at a fixed distance from the nozzles and so that the droplets travel at a selected velocity. Each nozzle is assigned printing responsibility for a lineal segment, the total number of segments produce a line across the width of the paper. To cause the droplets to fan out across its lineal segment, they are charged by a charging electrode at the breakoff point of the ink stream according to digital information signals and the charged droplets are passed through an electric field. Those droplets that are not to be printed are directed to a gutter for collection and recirculation.

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XEROX DISCLOSURE JOURNAL

DROPLET SENSOR ARRAY WITH AN EXTRA NEUTRAL STREAM SENSOR Chein-Hwa S. Tsao

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

In continuous stream, pagewidth printing from an array of fixed nozzles positioned transverse to the direction of the movement of paper, each nozzle produces a stream of ink. The ink from the nozzles is under a predetermined pressure and perturbated at a predetermined frequency, so that the streams break up into droplets at a fixed distance from the nozzles and so that the droplets travel at a selected velocity. Each nozzle is assigned printing responsibility for a lineal segment, the total number of segments produce a line across the width of the paper. To cause the droplets to fan out across its lineal segment, they are charged by a charging electrode at the breakoff point of the ink stream according to digital information signals and the charged droplets are passed through an electric field. Those droplets that are not to be printed are directed to a gutter for collection and recirculation.

It is known from US. Patent 4,255,754 to P.A. Crean et al. to place a sensor at each end of each segment to optically sense the droplets passing thereby and to check the charge on that droplet. The charge on the droplet passing by the sensor is used to monitor and correct the charges to be placed on subsequent droplets issuing from that nozzle in order to place accurately the droplets on their designated pixel locations on the paper.

In the accompanying figure, the droplet charging electrodes, the deflection

309 Volume 9 Number 5 September/October 1984

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DROPLET SENSOR ARRAY WITH AN EXTRA NEUTRAL STREAM SENSOR (Cont'd)

electrodes, the guttering assemblies, and paper are omitted for clarity. The ink str...