| 摘要 |
A new and improved graphic arts device for exposing copy sheets to controlled light from a light source passed through an image sheet includes a light source and a glass frame including a rigid panel of transparent material having a surface against which an image sheet and a copy sheet are pressed during an exposure cycle. A vacuum blanket is provided for biasing the image and copy sheets against the planar surface of the transparent panel. A yoke is provided for supporting the glass frame between the vacuum blanket and the light source at a convenient working level for movement between a horizontal, closed position used during exposure and a second, upwardly sloping open position for permitting removal and placement of the image and copy sheets on the transparent panel. The glass frame is normally locked in position on the yoke but can be unlocked for a full 360 DEG pivotal action about a central axis of the frame extending transversely between opposite legs of the yoke at said points thereon. This permits the transparent panel to be easily cleaned from the front of the device on both faces of the panel. The glass frame is formed of elongated frame member of extruded material, each frame member supporting an edge portion of the transparent panel. The panel is readily removed by detachment of one of the frame members by withdrawing a pair of fasteners used to attached the frame member to other frame members at right angles thereto. In addition, the graphic arts device is provided with a linkage mechanism for automatically lowering the vacuum blanket assembly away from the glass frame whenever the glass frame is pivoted upwardly toward the open position.
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