| 摘要 |
<p>A screen apparatus (42) including a screen plate (80) including a screen (82) and a screen frame (84) to which the screen is fixed, a support table (90) having a support surface (190) which supports the screen frame, an adjusting device (92) which adjusts a position of the screen plate relative to the support table in a direction parallel to the screen, a fixing device (94) which, when the adjusting device adjusts the position of the screen plate, permits the screen plate to be moved relative to the support table and, after the adjustment, presses the screen frame against the support surface of the support table, thereby fixing the screen plate to the support table, at least three balls (156) which are supported by the screen frame and/or the frame-support table such that each of the balls is movable between its advanced position and its retracted position, at least three biasing devices (192) each of which supports a corresponding one of the balls such that the one ball is rollable and which biases the one ball toward its advanced position, and at least three advanced-position defining devices (194) which define the respective advanced positions of the balls where the balls cooperate with each other to position the screen frame at a position apart from the support surface of the support table.</p> |
