| 摘要 |
<p>A high speed screen printing machine (20) is provided for accurately imprinting images on segments (205) bearing indicia (206) of a transparent web (34, 36). The machine (20) includes a vacuum platen (24) which is transversely adjustable to accommodate webs of differing widths, a camera assembly (28) beneath the platen (24) and indicia (206), and an X, Y, υ adjustable frame (30) supporting an upper screen frame support assembly (32) adapted to hold a printing screen (208) provided with reference indicia (212). When a segment (205) is initially positioned and held by platen (24), the camera assembly (28) is used to generate a combined image of the indicia (206) through the segment (205) and the screen reference indicia (212); a microprocessor controller uses this data, together with positional information establishing the location of the screen frame support assembly (32), and activates the three-motor adjustment frame (30) for simultaneous X, Y and υ adjustment of the support assembly (32) and camera assembly (28) until the screen (208) and segment (205) are registered. At this point, a squeegee is used to transfer the screen image onto the segment (205).</p> |
