| 摘要 |
The invention relates to a device for positioning a curing radiation source on an engraving cylinder or an engraving plate holder. The inventive device is suitable for use with an engraving unit which continuously forms a micro-relief that produces optical effects on a flexible laminate substrate and which can use, alternatively, interchangeable engraving cylinders (1) having different diameters, with a fixed distance between the external surface of the engraving cylinder (1) and the source (5), said distance corresponding to the focal length (F) of the source. Moreover, the invention comprises at least one support element (6) which is mounted on the shaft (7) or body of each interchangeable engraving cylinder (1) and which is used to support at least one end stop (8), said end stop being associated with a mobile structure (9) that supports the source (5). The length of the end stop(s) (8) is fixed while the diameter of the aforementioned support element (6) depends on the diameter of the corresponding interchangeable engraving cylinder (1), which is selected such that the distance (F) from the source to the external surface of the cylinder is constant, regardless of the diameter of the cylinder (1). |
