| 摘要 |
A doctor blade assembly for photogravure printing machines for the removal of excess printing ink from a printing surface comprising an elongated doctor blade having opposite longitudinal edge portions one of which has a contact surface adapted to contact a printing surface, a strengthening element secured to said doctor blade therealong and having a longitudinal edge terminating short of the contact surface, a plurality of individually connected though sequentially removable means between the longitudinal edge and the contact surface for supportive back-up of said one edge portion and for sequentially reducing the length of the removable means in a direction away from the contact surface whereby the distance between the last of the removable means and the contact surface is maintained essentially constant during the progressive wear of the doctor blade one edge portion. |
