| 摘要 |
Grinding machine of the copying type for grinding a concave surface of an article such as a lens blank, comprising a templet having a concave surface identical with that to be obtained on the article and with a mean sphere. The machine also comprises a pair of supports for the templet and the article, respectively, which are both rotatably driven in synchronism about two parallel axes, a movable copying head carrying a pin-point contact feeler engageable with the templet and a rotatably driven grinding wheel, and means for guiding the copying head so as to impart thereto a component of movement of rotation about fixed axis passing through the center of the mean sphere of the concave surface of the templet. This axis is parallel to a straight line passing through the centers of symmetry of the feeler and grinding wheel, while the distance between said straight line and the fixed axis is variable. |
