| 摘要 |
A material handling system (10) has a vacuum cup assembly (14) engagable with an object (20) and movable to move the object using a pressurized air s ource (12), a vacuum cup (16), a venturi device (18) and a vacuum valve (24) and auto-release valve (26). The venturi device (18) is in fluid communicat ion with the vacuum cup (16) and connected to the supply line (28) so that p ressurized air can be supplied to and through said venturi device to generat e a partial vacuum when the perimeter seal of the vacuum cup is engaged with the object surface. The vacuum valve (24) may open and close the supply lin e at a location upstream of the venturi device in response to a pressure lev el at the vacuum cup cavity. The auto-release valve (26) may vent the vacuum cup cavity to atmosphere in response to reduced pressure in the supply line at a location upstream from the vacuum valve (24).
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