Dampening system for printing presses, particularly offset printing
presses
    3.
    发明授权
    Dampening system for printing presses, particularly offset printing presses 失效
    印刷机防潮系统,特别是胶版印刷机

    公开(公告)号:US4130057A

    公开(公告)日:1978-12-19

    申请号:US856635

    申请日:1977-12-02

    IPC分类号: B41F7/26 B41L25/16

    CPC分类号: B41F7/26

    摘要: A dampening system for a lithographic printing press which includes, in series, a driven fountain roller, an adjustable intermediate roller, a driven distributor roller, and an adjustable form roller, the latter engaging the printing plate, the intermediate and form rollers being mounted upon respective throw-off levers. A single actuator is used, connected to the form roller throw-off lever. The intermediate roller throw-off lever is effectively in the path of final movement of the form roller throw-off lever, for throw-off by the latter, so that upon subsequent restoration to working position a water path is completed progressively through all of the rollers starting with the fountain roller, and with the form roller touching the plate last, thereby to insure, regardless of the length of the period of throw-off, that the form roller will be wetted to proper degree, free of either flooding or starvation, before being applied to the plate. It is one of the features of the invention that the reaction force of the intermediate throw-off lever against the form roller throw-off lever, upon throw-off, acts through the center of rocking movement of the latter so that the actuator does not have to resist the reaction force. In the preferred form of the invention pressureless "kissing" contact is retained between the intermediate roller and the fountain roller and between the distributor roller and the form roller under the condition of throw-off to insure that the residual moisture on the surfaces of the latter does not contract into droplets.

    摘要翻译: 一种用于平版印刷机的阻尼系统,其包括串联的驱动供料辊,可调节中间辊,从动分配辊和可调整成型辊,后者接合印刷板,中间和成型辊安装在 各自的脱手杠杆。 使用单个执行机构,连接到成型辊分离杆。 中间辊甩杆有效地位于成型辊甩杆的最终移动路径中,以便由后轮甩出,以便随后恢复到工作位置,水路逐渐通过所有的 辊子从供墨辊开始,并且成型辊最后接触板,从而确保,无论延长的时间长短,成型辊将被润湿到适当的程度,没有淹水或饥饿 ,然后再施加到板上。 本发明的特征之一是,中间脱离杆抵靠成型辊甩出杆的反作用力通过后者的摇摆中心作用,致使致动器不起作用 必须抵制反应力量。 在本发明的优选形式中,在脱落的条件下,在中间辊和供墨辊之间以及分配器辊和成型辊之间保持无压力的“接吻”接触,以确保后者的表面上的残留水分 不收缩滴。