Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1985-01-07
1987-01-06
Whitehead, Harold D.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51165TP, 5116572, B24B 914
Patent
active
046336184
ABSTRACT:
An improved lens grinding apparatus of the type including a grinding wheel for grinding lens blank, a wheel shaft for mounting the grinding wheel and two lens shafts adapted to rotatably clamp lens blank therebetween. The apparatus further includes a writing device for scribing a band of magnetized zone on the magnetic sheet by means of a writing magnet on the free end of the first arm, a reading device for reading the contour line of the magnetized zone by means of hole elements on the second arm and a center distance changing device for changing the center distance between the wheel shaft and the lens shafts in response to changing of the configuration of the contour line. These devices are operatively associated with one another and operations of each of them are controlled by a control system. The magnetic sheet is first magnetized to a certain polarity by a demagnetizing magnet and the magnetized zone is then magnetized to another polarity by a writing magnet on the first arm which is located in alignment with the follower roller adapted to contact with the V-shaped groove of a lens frame. The center distance changing device includes a moving block which is operatively connected to the lens shaft. One of two motors on the moving block has an output shaft which serves to turn the second arm.
REFERENCES:
patent: 3555739 (1971-01-01), Novak
patent: 3786600 (1974-01-01), Bloxsom
patent: 4096684 (1978-06-01), Akaba
patent: 4517870 (1985-05-01), Kopp
Koken Co.
Whitehead Harold D.
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