| 摘要 |
PURPOSE:To detect the amount of curvature of a long-sized material automatically and accurately by projecting slit light at right angles to the lengthwise direction of the long-sized material and shotting its reflected image by an image pickup device, and calculating the amount of displacement from the fixed position of the reflected image due to the relative movement of the long-sized material. CONSTITUTION:The slit light is projected upon the long-sized material 1a on a mount 8 from a projector 2 at right angles to the lengthwise direction of the material, and its reflected image is shot by an image pickup camera 3. The projector 2 and camera 3 are moved along the long-sized material 1a together with a carriage 4. If the long-sized material 1a is curved, the crescent reflected image is displaced by Yi like a crescent image 14 shown by an alternate long and two short dashes line according to the extent Xi of the movement. The amount of curvature of the long-sized material 1a is detected automatically and accurately by the extent of the displacement from the fixed position. |
