| 摘要 |
Apparatus for and method of forming a surface on, for instance, a contact lens. The apparatus includes first and second movable members. The first member is pivotally connected to suitable support structure for rotation about a first axis. The second member, which supports a cutting tool, is pivotally connected to the first member for rotation about a second axis. This second axis is offset from the first axis so that it (the second axis) rotates or pivots about the first axis when the first member is rotated. The apparatus also includes a cam surface and a cam follower. In the first embodiment the cam follower is located on the second member and the cam surface is located on a cam or third member which is pivotally connected to the support structure for rotation about a third axis. This third member is also interconnected with the first member so that rotation of the third member rotates or pivots the first member about the first axis. In an alternate embodiment, the cam follower is secured to the support structure and the cam surface is provided on the second member. In operation, the second member is rotated about the second axis until relative movement between the cam follower and the cam surface induces movement of the first member about the first axis to thereby continuously shift the position of the second axis. With the first member in motion, a suitable cutting tool secured to the second member undergoes a dual movement (rotation about the second axis plus simultaneous movement with the second axis as it pivots relative to the first axis) to form an aspheric surface on the contact lens. |
