APPARATUS FOR CUTTING AND SHAPING MATERIAL

摘要

An apparatus for cutting and shaping a material is disclosed which includes securing means for securing an adaptor having a lens blank or a semi finished lens is fixed thereto to apparatus for working. The securing means comprises a generally cylindrical housing (40) having first and second ends and a throughbore (42), the first end having a plurality of axial slots defining a plurality of finger-like members which can act as a collet. A piston (46) is disposed within the throughbore (42) and is axially movable therein, the piston (46) being connected to a sleeve member (60) which is mounted so that it surrounds the plurality of finger-like members. The securing means further comprises means for moving the piston (46) relative to the housing (40) and means for defining a sealed fluid chamber (48) between the piston and the piston moving means. In use a non-compressible fluid fills the fluid chamber (48) and activation of the piston moving means moves the piston (46) within the throughbore (42) thereby moving the sleeve members (60) so as to close the finger-like members around the adaptor thereby securing the adaptor within the cylindrical housing.