US Patent: 2,406,299
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| Machine Tool with Photoelectric Positioning of the Work Table
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Patentee:
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| Maurice Koulicovitch (exact or similar names) - Geneva, Switzerland |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 11, 1942 |
| Granted: |
Aug. 20, 1946 |
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Joel Havens
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Description: |
| Glascock, Downing & Sebold - patent attorneys
Application filed in Switzerland, 28 Dec 1940.
The object of the present invention is a machine tool with photoelectric positioning of the worktable. It will be used with advantage for instance to determine the position of sliding tables of measuring machines and precision tool machines such as center punching machines. The usual method for determining a position consists in observing with a microscope the divisions of a scale carried by the movable object and to bring the image of a given division to correspond with a reticle provided in the microscope. This method has the drawback that the precision of the reading depends on the skill of the operator and that the latter has to look intently into the ocular, which operation is fatiguing. The apparatus according to the present invention is characterized by a photo-electric cell facing the scale, by a grid inserted between said cell and said scale, and by a source of light arranged in such a way as to send its beams onto the scale. The grid presents spaces open to light (openings or transparent zones). The beams of light coming from the scale and passing through the grid impress the photoelectric cell, except when the divisions of the scale cover the open spaces of the grid and intercept the light feeding the cell. In this latter case, there is a corresponding reaction of the cell. The current variations of the photoelectric cell, amplified if necessary and transmitted further, can control the operations involved in the applications of the apparatus. In this way, the necessity to look into an ocular and the fatigue resulting therefrom are avoided.
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