| 摘要 |
A creasing device (10) for a work unit (11) of a machine (12) for at least creasing and possibly cutting a sheet made of a relatively rigid material, such as corrugated cardboard for packaging, fed in a determinate work direction (F), comprises a first creasing member (32) mounted rotatable with its first axis of rotation transverse to the work direction (F). The device (10) also comprises pre- creasing means (41) disposed upstream of the first creasing member (32) in the work direction (F), and configured to carry out a pre-creasing which progressively deforms the material of the sheet to be worked before it is subjected to the creasing operation proper. |
