Abstract: A frame holder has two jaws (1, 2) mounted so as to be slidable relative to each other in order to be movable toward or away from each other. A clamping mechanism (5) is provided for maintaining the frame (6) between the jaws in a reference plane. At least one jaw (1, 2) is provided with at least one sensor (14) which is adapted to produce a signal indicating the arrival of the jaw in a position of activation of the clamping mechanism (5) when the two jaws move toward each other. The frame holder can be used in an apparatus for analyzing rims of spectacles frames.

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).