Plastic article or earthenware shaping or treating: apparatus – Sets of male-female press molds
Patent
1995-05-01
1997-08-19
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
Sets of male-female press molds
4254519, 425453, 425808, 425DIG60, 4254051, B29D 1100
Patent
active
056586027
ABSTRACT:
An apparatus for forming contact lenses, wherein front curve mold halves are filled with a hardenable transparent material, such as a polymerizable hydrogel, and back curve mold halves are coupled to the front curve, therein forming a lens. More particularly, the apparatus includes a conveyor for transporting pallets of mold halves to the apparatus, an array of piston structures for raising and aligning the back curves with respect to the filled front curve halves, a mechanism for reciprocating the piston array to couple pairs of front and back curves, and a vacuum chamber for maintaining a vacuum around the curves during coupling. In addition, there is provided individual spring biasing to each reciprocating element whereby sensitivity to thickness variations and pallet misfeeds may be minimized. Further, there is provided a vacuum sleeve, through which the pistons reciprocate within the vacuum chamber, which sleeve preserves the vacuum within the chamber.
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Adams Jonathan Patrick
Andersen Finn Thrige
Kindt-Larsen Ture
Martin Wallace Anthony
Steven Jeffrey Eldon
Johnson & Johnson Vision Products Inc.
Mackey James P.
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