| 摘要 |
<p>Apparatus for coating articles with plastics material comprises a number of workholders (45) each consisting of a conduit and at least one jig (57) attached to the conduit. Each jig is adapted to support one or more articles to be coated. The apparatus further includes means for passing a continuous flow of cooling fluid through the conduits when the apparatus is in operation, an oven (58) for heating the articles on the workholders, a fluidizable bed (62) of plastics coating material and means for lowering the heated articles into the bed (62) for a predetermined period to allow coating of the articles to a predetermined thickness to take place and for subsequently lifting the articles from the bed. The lowering and lifting means comprise a parallelogram linkage consisting of a straight arm (43) and a cranked arm (44) for each worlholder which is pivotally connected to its respective arms. The cranked arm (44) is arranged to be acted on by a pneumatic cylinder (7O) whereby movement of the associated piston in one direction is effective to lower the and the associated worlholder and movement of the piston in the other direction is effective to lift the arm and workholder. In operation of the apparatus, the workholders are moved through a circular path whereby at a first station the jigs are loaded with one or more articles, the workholders then pass through the oven (58) to heat the articles, each workholder is then brought in turn to a station at which the associated arm (44) is acted on by the cylinder (70) and the articles suspended from the workholder are lowered into the fluidized bed (62) and then lifted out of the bed, the articles are then allowed to cool and are finally removed from the jigs at an unloading station. The jigs and workholders are maintained at a temperature below the fusion point of the plastics material by the cooling means so that they are not coated while the articles are being coated with said plastics material. </p> |
