Intaglio engraving
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The engraver as recited in one of claims 8 to 10 wherein the ink controller (144) comprises an engraved area which is engraved at less than a maximum engraving depth.ġ2. The engraver as recited in claim 8 or 9 wherein the at least one ink controller (144) comprises an unengraved area (145) situated in the intaglio pattern (142).ġ1. The engraver as recited in claim 8 wherein the ink controller (144) comprises a post situated in the intaglio pattern (142).ġ0.
#Intaglio engraving generator#
The engraver as recited in one of claims 1 to 7 wherein the controller means (34) comprises an ink controller generator for modifying the intaglio engraving signal (38) such that the intaglio pattern (142) comprises at least one ink controller (144) when the intaglio pattern is engraved.ĩ. The engraver as recited in claim 6 wherein the relief angle is about between 10 and 20 degrees.Ĩ. The engraver as recited in one of claims 2 to 5 wherein the stylus (58) comprises a relief angle of more than 5 degrees.ħ. The engraver as recited in one of claims 2 to 4 wherein the stylus (58) comprises a tip which is generally U-shaped.Ħ.
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The engraver as recited in claim 2 wherein the engraving head (26) comprises a response time of less than 200 microseconds.ĥ. The engraver as recited in claim 2 wherein the engraving head (26) comprises a response time of about 200 microseconds.Ĥ. The engraver as recited in claim 1 wherein the engraving means comprises an engraving head (26) having an engraving stylus (58).ģ. An engraver for engraving a cylinder (12) for printing an intaglio pattern comprising: a) drive means (30) for rotatably driving the cylinder (12) b) controller means (34) coupled to the drive means (30) for controlling the operation of the engraver and for generating an intaglio engraving signal (38) corresponding to the intaglio pattern c) engraving means coupled to the controller means (34) for engraving the cylinder (12) with the intaglio pattern during rotation of the cylinder (12) in response to the intaglio engraving signal (38),Ĭharacterised in that d) the controller means (34) is able to generate the intaglio engraving signal (38) such that the intaglio pattern comprises one or more substantially continuous intaglio characters (73) comprising of a plurality of trenches or elongated trenches (77a).Ģ. The apparatus and method facilitate engraving intaglio grooves or trenches which may be generally rectangular in cross section, and which were engraved in response to a pulse-width modulated intaglio engraving signal generated by the computer.ġ. There is also provided apparatus and method for controlling ink flow in large engraved areas or intaglio trenches. The apparatus and method also comprise a fine line boost routine for facilitating engraving fine areas or lines of the intaglio pattern. The engraving head also is capable of engraving at response times of less than 200-300 microseconds, thereby enabling the engraving head to engrave the intaglio pattern on the cylinder during the rotation of the cylinder in response to the intaglio engraving signal. The engraver also comprises an engraving head comprising a stylus having a generally flat cutting edge or surface.
#Intaglio engraving driver#
The engraver comprises a driver for rotatably driving the cylinder and a computer for controlling the operation of the engraver and for generating an intaglio engraving signal corresponding to the predetermined intaglio pattern. This invention relates to an engraving method and apparatus for engraving a cylinder for printing an intaglio pattern on a web of material. Abstract of corresponding document: US5675420