Idanit Technologies Ltd.

Uri Adler

Gershon Miller

Ori Miller

A method of operating for an ink jet printer having a printer head bearing a plurality of equi-distantly spaced ink jets for printing parallel lines of dots on a substrate in n passes of the print head over the substrate. Between each pass of the printer head over the substrate, the printer head is displaced in a direction perpendicular to the direction of the lines by a distance y that satisfies: (i) y&equals;m,&times;a where m,is a natural number equal to 2 or more and a is the separation gap between adjacent lines; (ii) y is not a multiple of the inter ink jet separation distance of the printer head; and (iii) m,and n do not have a common factor except the factor with the value of 1. These conditions on y ensure that two adjacent lines are printed by different ink jets and that each line is printed by only one ink jet.

Method for operating an ink jet printer

A method and apparatus for direct production of photopolymeric printing plates. The method comprises forming a positive and/or negative image on a substrate by ink-jet printing with a photopolymeric ink composition, optionally preheated. The apparatus for carrying out the method of the invention comprises a rotatable drum adapted for retaining on its inner or outer surface the substrate to be printed; a carriage, displaceable axially in respect of the drum; a container for a photopolymeric ink composition; at least one nozzle communicating with the carriage for ejecting the photopolymeric ink composition; and a UV source located so as to expose the printed surface of the substrate to UV radiation.

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Holon, Israel

Uri Adler