Abstract: The invention is a grinding machine for ophthalmic glasses (14) of the type featuring a carriage (10) bearing a clamping axle in two parts (12A, 12B) between which a blank (14) of an ophthalmic glass is clamped and of the type equipped with a clamping device which axially acts upon at least one (12B) of the two parts (12A, 12B) of the clamping axle and features to that effect at least one geared motor (60, 66) and motor motive power transmission components (54, 28) which cause an axial translation of said part (12B) of the clamping axle, characterized by the fact that one (54) of the transmission components (28, 54) slides in relation to the carriage (10) in a direction parallel to the clamping axle against which (10) it rests axially with a reaction spring (80) mounted in between, and by the fact that a control unit is provided to vary the motor (66) motive power, and thus the axial clamping force on the blank (14) as a function of the elastic deformation of the spring (80).

Abstract: The frame holder for prescription glasses (24) of the type featuring two jaws mounted in such manner that they slide in relation to each other so that they can move toward or away from each other, and also featuring a device (22) to center the frame (24) between the jaws (12) so as to hold said frame (24) in a reference plane (P), characterized by the fact that it features a device (30) to support frame (24) approximately in the reference plane (P) before the frame (24) is clamped inside the jaws (12).

Abstract: A machine for grinding opthalmic glasses including a carriage, a clamping shaft carried by the carriage and composed of two shaft parts for clamping therebetween an opthalmic glass blank, and a clamp cooperative with at least one of the shaft parts for exerting an axial force thereon. The clamp includes a motor-speed reducer unit having a motor, transmission elements for transmitting the driving force of the motor to at least one of the shaft parts, a housing enclosing the motor and the transmission elements and mounted relative to the carriage to pivot about a pivot axis, a reaction spring connecting the housing to the carriage, and a control unit associated with the motor and with the spring for varying the driving force of the motor as a function of the variation in the length of the spring.

Abstract: The invention provides a machine for grinding and bevelling ophthalmic glasses of the type comprising a carriage (1) mounted to be movable in translation and in oscillation in a direction parallel with and perpendicular to a shaft (5) carrying at least one grinding wheel (4, 4A), and means for measuring the distance (L1) between the plane (PO) tangent to the pole (0) of the convex face of the glass (3) and the edge of the convex face, characterized in that the measuring means comprise means defining a reference surface (S) which is connected to move axially in translation with the grinding wheel, extends in a radial plane perpendicular to the axis of rotation of the grinding wheel and with which at least one point of the edge (A) of the convex face of the glass (3) is brought into contact by a movement in translation of the carriage (1), a sensor (18) for measuring the movements in translation of the carriage (1) relative to the grinding wheel (4) and means (12) for analyzing and processing signals from the s

Abstract: Machine for grinding and bevelling ophthalmic lenses of the type comprising a carriage movable in translation and in oscillation in directions parallel to and perpendicular to a shaft carrying grinding wheels for edge trimming (4) and bevelling, and a follower (7) for measuring the distance between the plane tangent to the pole of the convex surface of the lens and the edge of the surface and for measuring the value which corresponds to the width of the edge surface (12) of the lens (3). The follower (7) has a surface (8) having a convex curvature identical to that of the grinding wheel and which comprises a matrix of detection elements which cooperate with the edge surface (12) of the lens. Each of the detection elements is connected to a corresponding portion of a sensor (14) to which it transmits a signal representing the passage of a part of the edge surface (12) of the lens in front of the corresponding detection element.

Abstract: The apparatus comprises a device which explores without contact the inner contour of the frame rim (16) and employs an optical device (30) for sensing the image of characteristic points of the rim inner contour, an analyzer for analyzing the sensed images for determining the spatial coordinates of the characteristic points, and a calculating device for reconstituting the shape and/or the profile of the contour of the frame rim from these spatial coordinates.

Abstract: Device for mounting an adapter (18) on a lens blank (12), in particular for a lens centering machine (10). The device is of the type comprising a housing (22) in which is slidably mounted a mounting shaft (24) having an end (26) which is adapted to receive the adapter (18). The housing (22) is mounted to be movable between a position for loading the adapter (18) at the end (26) of the slidable shaft (24) and a position for mounting the adapter (18) in which the slidable shaft (24) extends in a direction (X--X) perpendicular to a support surface (P) for the lens blank (12). The device further comprises a frame (11) on which the housing (22) is mounted to be pivotable about a first pivot pin (34,Z--Z) parallel to the support surface (P) between the adapter-loading position and the adapter-mounting position, and an arrangement (50,64,72) for consecutively actuating the pivoting of the housing (22) and the sliding of the slidable shaft (24).