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: 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: 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).

Abstract: The device is of the type comprising a carriage slidably and pivotally mounted on a shaft (101), and an arm (102) connected to the carriage and bearing against and slidable along a rail (108) parallel to the shaft (101), the arm (102) bearing against the rail (108) through an element (110) for actuating a sensor (112) mounted on the arm (102), a roller (111) being interposed between the rail (108) and the actuating element (110) and being rotatively mounted on the latter. According to the invention, the actuating element is a rod (110) mounted by a first end (125) of the two ends (125, 113) of the rod on the arm (102) to pivot about a pivot pin (126) which is parallel to the shaft (101) and disposed in the vicinity of the rail (108). The sensor (112) is mounted on the arm (102) and cooperates with one of the two ends (125, 113) of the rod (110). A system (127-131) for balancing the force (F) applied to the rod (110) by the roller (111) is provided.

Abstract: The device comprises a grille (9) by multiple slats (11) which are inclined in the manner of slats of Venetian blinds, in the direction of rotation of the grinding wheel, and are disposed obliquely relative to the horizontal between two upright plates (10,10') to which the slats are fixed by the ends of the slats. Openings (12) are provided in one plate (10') of the plates which carries the lowermost ends of the slats 11, in the region of these ends.

Abstract: The machine for grinding ophthalmic glasses comprises a housing (1) open in its upper part and housing a grinding wheel (7) driven in rotation on a first horizontal shaft (6), a U-shaped carriage (13) pivotally mounted on a second horizontal shaft (11) and located above and at the rear of the first horizontal shaft (6) and carrying between the wings of the carriage a shaft (14) in two parts which clamp therebetween a work piece (15) to be machined, the carriage being movable about and along the second shaft. The machine further comprises a hood (2) having a pivotal upper panel (5) and mounted in the housing (1) to be pivotable between an upper closing position and a lower opening position, a motor (20) for driving the hood, and a first device (26, 27) and a second device (24, 25) for raising the carriage and the panel respectively when the hood moves from its upper position to its lower position.