Valve and supplying device for filling a molding cavity with a polymerizable material
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsDavid Freson, Jean-François Cailloux
Life of this patent
Estimating the term…
Abstract
The inventive valve comprises a dosing chamber (20) connected to a dispenser (16) provided with input and output orifices (7, 8) which are connected to said dosing chamber (20) when the dispenser (16) is in a position (21), an injection orifice (9) being isolated. When the dispenser (16) is in a position (23), the input and output orifices (7,8) are isolated from the dosing chamber (20) and from an injection orifice (9) which are connected to each other. In addition, said device comprises a source of polymerisable material which is provided with a container (5), a continuous pump (6) and a control unit (3) for control elements (19, 24) of the valve (2).
Claims16
Valve suitable for filling, with a polymerizable material, a cavity (10) for molding an optical lens, especially an ophthalmic lens, which valve (2) includes a material inlet orifice (7), a material outlet orifice (8), an orifice (9) for ejecting material into said cavity (10), and a distributor (16) for putting into communication with each other or isolating from each other the material inlet orifice (7), the material outlet orifice (8) and the ejection orifice (9), which valve is characterized in that:
- it includes a dosing chamber (20) connected to said distributor (16), a mobile piston (18) whose position fixes the volume of said dosing chamber (20), means (19) for controlling the position of said mobile piston (18), and means (24) for controlling the position of said distributor (16);
- the inlet orifice (7) and the outlet orifice (8) are in permanent communication;
- and
- said distributor (16) has a first position (21) in which said material inlet orifice (7) and said material outlet orifice (8) are in communication with said dosing chamber (20) and in which said ejection orifice (9) is isolated from said material inlet orifice (7), from said material outlet orifice (8) and from the dosing chamber (20), and has a second position (23) in which said material inlet orifice (7) and said material outlet orifice (8) are isolated both from the dosing chamber (20) and from the ejection orifice (9) and in which the dosing chamber (20) and the ejection orifice (9) are in communication with each other.
Dependencies are inferred from the claim text.