Gravure engraving system and method including engraving overlapping cells

摘要

An adding portion 105 superposes a density signal (a signal having its level changing in accordance with a density of a printed image) from a density signal generator 101 on a carry signal (a signal in the form of a sine wave having a prescribed frequency and a prescribed amplitude) from a carry signal generator 102 to generate an engraving signal. A stylus included in an engraving head 21 reciprocatively vibrates according to the applied engraving signal to engrave cells on a gravure cylinder rotating in the main scanning direction. A sub-scanning motor 107 moves the engraving head 21 in a sub-scanning direction perpendicular to the main scanning direction every time cells for one line in the main scanning direction of the gravure cylinder have been engraved. At this time, the moved amount of the engraving head 21 in the sub-scanning direction is controlled so that cells adjacent in the sub-scanning direction partially overlap with each other in every other line.