| 摘要 |
<p>HAROLD P. DAHLGREN INK METERING APPARATUS Ink metering apparatus comprising a resilient surfaced roller urged into pressure indented relation with a printing plate; a source of ink positioned to apply an excess of ink to the surface of the roller which has applied ink to the printing plate; and a resilient metering member having a hard, smooth, polished, highly developed, flexible edge resiliently urged in a direction generally radial of the roller and rigidly supported in a direction generally tangent to the roller surface for forming a film of controlled thickness on the surface of the resilient roller. The flexible polished edge on the metering member is positioned in pressure relation with the resilient roller surface such that ink carried by the resilient roller surface impinges against a metering surface on the metering member adjacent the polished edge. The flexible polished edge is resiliently urged into pressure indented relation with the resilient roller surface by a force of sufficient magnitude to deform the flexible polished edge and the resilient roller surface such that the edge and the roller surface complement each other and cooperate to form an orifice which is self-adjusting to imperfections of the metering member and the resilient roller surface. The metering surface on the metering member, against which ink impinges, is oriented such that hydrokinetic forces exerted by the ink on the metering member do not significantly alter the ink film when the surface speed of the resilient roller surface is changed. The metering member is positioned such that the angle of departure between the metering member and the surface of the roller which has passed the polished edge is sufficient to cause separation of the ink from the metering member to prevent trailing of ink along the surface of the metering member.</p> |
