Mold unit for molding ophthalmic lenses

Mold unit (22) for molding ophthalmic lenses, the mold unit (22) comprising:

• an adapter piece (220) for insertion into a compartment (20) of a lens mold carrier (2), the adapter piece comprising an opening (2200) extending around a longitudinal axis (2201);
• a sleeve (221) fixedly connected to the adapter piece (220) and extending along the longitudinal axis (2201) through the opening (2200) of the adapter piece (220);
• a lens mold (222) rigidly mounted to the sleeve (221);
• an adjustment ring (224) firmly attached to the sleeve (221) and mounted to the sleeve (221) in a manner such as to circumferentially surround a portion of the sleeve (221);
• wherein the adjustment ring (224) comprises a circularly curved smooth non-toothed outer engagement surface (2244) facing radially outwardly and extending in a circumferential direction around the sleeve (221), and wherein the adapter piece (220) comprises at least one clamping block (2211) having a circularly curved smooth non-toothed inner clamping surface (2214) facing radially inwardly towards the circularly curved smooth non-toothed outer engagement surface (2244) of the adjustment ring (224), the at least one clamping block (2211) being arranged such that the circularly curved smooth non-toothed inner clamping surface (2214) of the clamping block (2211) frictionally clamps the circularly curved smooth non-toothed outer engagement surface (2244) of the adjustment ring (224) so as to prevent inadvertent rotation of the sleeve (221) relative to the adapter piece (220) but to allow rotation of the sleeve (221) relative to the adapter piece (220) upon the application of a torque to the sleeve (221) which is higher than a predetermined threshold torque in the range of 0.3 Nm to 0.6 Nm.