| 摘要 |
A vacuum frame apparatus including a latching system with means to assist in repressurizing the vacuumized area of the frame includes a vacuum blanket support frame pivotally mounted along one side of a glass panel for holding workpieces in precise registration against the glass panel for making copies includes a hollow rectangular frame around a flexible vacuum blanket. The frame members have a plurality of small vacuum ports on the underside inside a peripheral bead seal for evacuating the space between the flexible vacuum blanket and the glass panel when a vacuum is pulled on the interior of the hollow peripheral frame by a vacuum pump. Large size frontal ports are provided on the front side member of the frame to cooperate with batch mechanisms for clamping and holding the frame tightly against the glass panel during copy making. The latch members serve a dual function of latching and holding the frame in a closed position for exposure of material and automatically closing and opening the frontal ports, respectively, when the latch mechanisms are operated to speed up breaking of the vacuum and opening of the frame at the end of a copy making cycle in readiness for the next operation.
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