Abstract: Machine for edging and bevelling ophthalmic lenses comprising guide means r forming a small bevel on the edge of lenses having a relatively thick edge, said guide means comprising a guide member connected to the frame of the machine by means of a pair of links forming a parallel-link motion device, a pair of springs constantly urging said links to a stable position in which their longitudinal axes form a predetermined angle with the axis of the rotating spindle which supports the lens to be bevelled, a bearing member supported by a movable carrier for said spindle and urged for engagement with said guide member, one of the guide member and bearing member comprising a bar extending at right angles to the spindle axis and provided with coupling means capable of preventing any relative movement between the guide member and the bearing member in a direction at right angles to the spindle axis. The adjustments of the machine for forming the small bevel art thus greatly simplified.

Abstract: A device for attaching on a spectacle lens a block for mounting on a lens edging or bevelling machine comprises fixed mounting block holding means, lens holding means located substantially in one plane and movable between a rest or centering position, in which the lens to be blocked is at a distance from the mounting block and a blocking position for securing the mounting block on the lens. This device further comprises centering marks located substantially in the plane formed by the lens holding means when no lens is placed on said holding means. The centering marks are movable in a direction substantially perpendicular to said plane in such a way that they are always in contact with the surface of a lens placed on its holding means, said surface being the surface adapted to receive subsequently the mounting block.