| 摘要 |
ION POSITIONING SYSTEM FOR A COATER A die, preferably one with internal metering pumps for applying an extremely uniform coating to a traveling web, is mounted over a pair of very rigid side plates. Horizontal surfaces of the plates support linear slides which in turn support the die through uprights. The slides have preloaded bearings to allow a linear movement of each upright with no lost motion. Pneumatic cylinders move each upright along its slide independently of the other upright. Adjustable stops set the die-to-web spacing when the cylinders draw the uprights, and therefore the die, toward the web. Other air/hydraulic cylinders drive the uprights away fro- the web, against the action of the main cylinders, to jump splices in the web. The system preferably-includes an outrigger arm extending from each upright to a pair of auxiliary linear slides mounted on the side face of each side plate to relieve side loading on the main linear slides. In the preferred form, the stops are positioned and the actuators are controlled by a servo loop to provide, in combination with the independently movable uprights, continuous automatic control of the cross web coating dimensions in response to a coating thickness sensor. The servo system preferably also controls adjustment screws across the die to provide a continuous automatic control of the web coating profile. |
