| 摘要 |
PURPOSE:To obtain a strong suction force without any lowering by a method in which a number of valve chambers are provided below suction ports connected to the suction holes and the openings of the valve chambers in the face of the suction holes not to be closed by an object to be printed are automatically closed by ball valves to be lowered by the suction force of a vacuum device. CONSTITUTION:When a vacuum device is actuated, ball valves 8 in valve chambers 6 facing suction holes 5 closed by an object 4 to be printed are slowly lowered when overlapping the object 4 to be printed, having an arbitrary size, on a suction case 3 but fail to close the lower openings of the chambers 6. The valves 8 in the chambers 6 facing the holes 5 not closed by the object 4 press springs 7, go down, and closely adhere to the lower part of the chambers 6, where the openings are closed to completely prevent the inflow of open air from the holes 5 into the suction case 3. The object 4 can thus be strongly sucked to the upside of the case 3.
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