| 摘要 |
<p>A dampener for a lithographic press comprises a form roller (20b), a metering roller (22b), a reservoir of dampening solution lying above and between the form and metering rollers (20b,22b), and means for supplying solution to the reservoir. The amount of solution applied to the form roller (20b) can be controlled by adjusting the pressure between the form and metering rollers (20b,22b) without appreciably affecting the pressure between the form roller (20b) and the plate cylinder (10b). Excess moisture retained on the form roller (20b) and excess solution which collects between the plate cylinder (10b) and the form roller (20b) is continuously returned directly to the reservoir. The metering roller (22b) and the plate cylinder (10b) are driven by the press gear drive system, and the form roller (20b) is driven from frictional contact with the plate cylinder (10b) and the metering roller (22b), to aid in retrofitting the dampener to existing presses.</p> |
