| 摘要 |
A lithograph press in which a web is simultaneously printed on both sides by passing the web between a pair of blanket cylinders, the blanket cylinders being gear driven from associated plate cylinders and the plate cylinders being coupled to a common drive shaft. An auxiliary torque loading is applied, by means of brakes, to the blanket cylinders, thereby to minimize the effect of transient changes in loading which tend to occur within the rotative cycle because of the tendency of one blanket cylinder momentarily to over-drive the other. In the disclosed embodiment the braking is accomplished by means of loaded hydraulic pumps coupled to the respective blanket cylinders.
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