Patent ID: 6058835
Filing Date: 2000-05-09
Classification: B41F,H05K

Abstract:
A screen apparatus, comprising:a screen plate including a screen and a screen frame to which a peripheral portion of the screen is fixed;a frame-support table having a frame-support surface which supports the screen frame of the screen plate;a position adjusting device which is connected to the frame-support table and which adjusts a position of the screen plate relative to the frame-support table in a direction parallel to the screen;a fixing device which, when the position adjusting device adjusts the position of the screen plate, permits the screen plate to be moved relative to the frame-support table and, after the adjustment of the position, presses the screen frame against the frame-support surface of the frame-support table, thereby fixing the screen plate to the frame-support table;at least three balls which are supported by at least one of the screen frame and the frame-support table such that each of the balls is movable between an advanced position thereof and a retracted position thereof;at least three biasing devices each of which supports a corresponding one of the balls such that said one ball is rollable and which biases said one ball toward the advanced position thereof; andat least three advanced-position defining devices 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 by a predetermined distance from the frame-support surface of the frame-support table.