Apparatus for processing a lens

An apparatus for processing a peripheral portion of a spectacle lens in accordance with data describing a shape of a lens frame, the apparatus comprising:

• a lens support that is freely displaceable towards a tool and comprises a holding shaft supporting the lens so that the lens is freely rotatable, and a detector disposed to detect an angle of rotation of the holding shaft;
• a positioning member movable to contact with and separate from the lens support, wherein the positioning member restricts displacement of the lens support towards the tool at a position corresponding to a prescribed lens processing amount that is determined based on the rotation angle and data describing a shape of a lens frame at the rotation angle;
• a means for amplifying a relative displacement that amplifies a relative displacement between the lens support and the positioning member;
• and
• a detector disposed to detect, using the amplified relative displacement, when processing conducted at the rotation angle has been completed while the lens support contacts the positioning member,
• wherein the means for amplifying a relative displacement comprises a swinging member that contacts the lens support, wherein the swinging member is supported by a swing shaft disposed on the positioning member, and a first distance between the swing shaft and a position where the swinging member contacts the lens support is smaller than a second distance between the swing shaft and a free end portion of the swinging member.