| 摘要 |
<p>A doctor-blade assembly for a printing machine surface comprises a doctor blade (11) supported at the end by a pair of carriages (12) moving along guides (23) parallel with the doctoring direction on the surface. The carriages comprise compressed air means (13) for movement of the doctor blade in the direction of approach towards and withdrawal from the surface and compressed air means (14) for inclination of the doctor blade with respect to the surface. A valve assembly (17,18) and a valve assembly (15) supply the compressed air means (13) respectively with a pressure which compensates the weight of the doctor blade and with a predetermined thrust pressure of the doctor blade against the surface. Upon command a valve (21) sends a doctor-blade raising pressure. <IMAGE></p> |
