Abstract: A process for controlling a lens manufacturing process comprising the steps of: a) manufacturing a master lens according to a manufacturing process using a manufacturing device, b) measuring by using at least a measuring device at least one parameter of the master lens of step a), c) recording the value of the parameter, d) repeating regularly step a) to c) and checking the evolution of the parameter over time, wherein the evolution of at least one parameter of the manufacturing device used during the lens manufacturing process is checked over time and the evolution over time of at least one parameter of the master lens is related with the evolution over time of the at least one parameter of the manufacturing device.

Abstract: A process for controlling a lens manufacturing process comprising the steps of a) manufacturing a master lens according to a manufacturing process using a manufacturing device, b) measuring by using at least a measuring device at least one parameter of the master lens of step a), c) recording the value of the parameter, d) repeating regularly step a) to c) and checking the evolution of the parameter over time, wherein the evolution of at least one parameter of the manufacturing device used during the lens manufacturing process is checked over time and the evolution over time of at least one parameter of the master lens is related with the evolution over time of the at least one parameter of the manufacturing device.

Abstract: A method includes the following steps: a first shell (12) is immobilized in a first shell carrier (6); a second shell (29) is immobilized in a second shell carrier (27); the first shell carrier (6) is oriented in such a way that a useful moulding surface of the first shell (12) faces upwards and forms the base of a vessel; a pre-determined quantity of polymerizable material is placed in the vessel; the first shell carrier (6) and the second shell carrier (27) are moved into a pre-determined relative position wherein the first shell (12) and the second shell (29) are in a pre-determined moulding position, by at least partially arranging the second shell (29) in the vessel, at a distance from the edges thereof. The inventive device includes a structure for positioning the shell carriers.

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).

Abstract: The inventive device includes a first shell holder (6) for fixing a first shell (12), a second shell holder (27) for fixing a second shell (29), a first support (1) on which the first shell holder (6) is mounted and a second support (2) on which the second shell holder (27) is mounted, the first (1) and second (2) supports being pivotable with respect to each other. When the first (1) and second (2) supports are in a first relative position thereof they are arranged oppositely to each other, thereby bringing the first (12) and second (29) shells into a predetermined relative moulding position thereof. When the first (12) and second (29) shells are brought into the second relative position thereof, the first (1) and second (2) supports are removed from each other by pivoting motion.

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).

Abstract: The inventive device includes a first shell holder (6) for fixing a first shell (12), a second shell holder (27) for fixing a second shell (29), a first support (1) on which the first shell holder (6) is mounted and a second support (2) on which the second shell holder (27) is mounted, the first (1) and second (2) supports being pivotable with respect to each other. When the first (1) and second (2) supports are in a first relative position thereof they are arranged oppositely to each other, thereby bringing the first (12) and second (29) shells into a predetermined relative moulding position thereof. When the first (12) and second (29) shells are brought into the second relative position thereof, the first (1) and second (2) supports are removed from each other by pivoting motion.

Abstract: A method includes the following steps: a first shell (12) is immobilized in a first shell carrier (6); a second shell (29) is immobilized in a second shell carrier (27); the first shell carrier (6) is oriented in such a way that a useful moulding surface of the first shell (12) faces upwards and forms the base of a vessel; a pre-determined quantity of polymerizable material is placed in the vessel; the first shell carrier (6) and the second shell carrier (27) are moved into a pre-determined relative position wherein the first shell (12) and the second shell (29) are in a pre-determined moulding position, by at least partially arranging the second shell (29) in the vessel, at a distance from the edges thereof. The inventive device includes a structure for positioning the shell carriers.

Abstract: A lens holding spindle for grinding machines is provided comprising two substantially cylindrical elements mounted concentrically one inside the other, one of the two elements forming the body of the spindle intended to be fixed to the grinding machine, the other element comprising, at one of its ends, a recess for receiving a metal block fixed to one face of a lens, the other face of which is to be ground; the body of the spindle is the inner cylindrical element which comprises an end portion which projects axially inside the recess of the external cylindrical element and which has an end face forming both a fixed reference and an axial bearing surface for the lens to be ground; the external cylindrical element is mounted for sliding on the inner cylindrial element; clamping means mounted on one of said two cylindrical elements for clamping the other of the two cylindrical elements.

Abstract: A machine for fashioning vegetables and similar products.The machine comprises: a fashioning gripper 12 comprising two jaws 18, 19 adapted for seizing the vegetable via opposed axial actions; a fashioning tool 17 rotating about an axis parallel to the common axis of the fashioning gripper and of the vegetable, said tool being in the shape of a solid of revolution about its rotation axis; means 40 for successively bringing the fashioning tool 17 near and away from the fashioning gripper 12; means 27 for rotating the gripper about itself over a predetermined angle, between two fashioning operations, and an outlet cutting station with two spaced apart cutting tool 43, adapted for eliminating on the facetted vegetable end portions, at least in the areas where the fashioning tool has not removed material, so that the machined facets end axially on two end radial faces.

Abstract: Apparatus for machining, polishing and/or smoothing workpieces having curved surfaces such as optical or ophthalmic lenses. A bearing head maintains a tool against a workpiece. Pressure is applied by a pneumatic piston and cylinder unit for establishing contact pressure between the workpiece and the tool. An eccentric drive mechanism including a compound table generates relative displacement between the workpiece and the tool. The pneumatic piston and cylinder unit actually forms part of the tool holder spindle. The cylinder or piston rod of the unit is provided with a tool holder block mounting the tool and the other of the piston rod or cylinder is attached to the drive mechanism. The bearing head has a freely rotating position and a locked position preventing rotation.