| 摘要 |
<p>An engraving system (10) and method is disclosed having multiple engraving heads (22, 24) wherein the operation of each head is controllable so that a vertical and/or horizontal screen may be independently controlled, enabling each engraving head to engrave in accordance with different screen rulings selected by a user. The engraving system includes a signal generator for controlling the vertical screen by utilizing a plurality of vertical scalers which use a cylinder factor signal corresponding to the rotational position of a cylinder (16) and as screen variables, such as a screen angle and screen ruling, to generate independent vertically scaled signals which are used to independently energize the engraving heads to engrave patterns defining different vertical resolutions or vertical screens. This system and method also discloses a drive system (28) for independently driving the engraving heads using the cylinder factor signal and the screen variables to enable the engraving heads to engrave patterns having differing horizontal resolution or horizontal screens.</p> |
