![]() ![]() The basis weight measuring apparatus for sheet tobacco according to claim 5, wherein said light source has an optical axis inclined relative to the axis of the aperture.ħ. Wherein the sheet tobacco is rolled sheet tobacco and the camera is disposed on the axis of the aperture while the light source is disposed to deviate from the aperture in a direction along the transport path or a direction across the transport path.Ħ. ![]() The basis weight measuring apparatus for sheet tobacco according to claim 4, Wherein the transport path further includes a transport guide plate disposed in the clearance, and guiding transport of the sheet tobacco when the sheet tobacco moves from the upstream section toward the downstream section through the measurement position and an aperture formed in the transport guide plate, and allowing the sheet tobacco passing through the measurement position to be exposed to the light source, and the aperture has an axis perpendicular to the transport guide plate.ĥ. The basis weight measuring apparatus for sheet tobacco according to claim 3, Wherein the transport path includes an upstream section that transports the sheet tobacco toward the measurement position and a downstream section disposed with a clearance, in which the measurement position is defined, interposed between the downstream section and a downstream end of the upstream section, the downstream section transporting the sheet tobacco passing through the measurement position and said light source and the camera are disposed with the clearance put therebetween.Ĥ. The basis weight measuring apparatus for sheet tobacco according to claim 1, ![]() Wherein the camera is a color camera that obtains the image as a color image and the calculation section has a transformer that transforms the color image into a grayscale image, and calculates an average gray level based on the grayscale image.ģ. A basis weight measuring apparatus for sheet tobacco, the apparatus comprising:Ī light source disposed on a transport path for the sheet tobacco, and emitting light toward the sheet tobacco passing through a measurement position defined in the transport path and a visual sensor including a camera disposed with the transport path put between said visual sensor and said light source, said visual sensor measuring a basis weight of the sheet tobacco based on an image of the sheet tobacco taken by the camera when the sheet tobacco passes through the measurement position, wherein said visual sensor further includes: a calculation section calculating an average gray level of the image and outputting the average gray level and a converter having a conversion map indicating a relationship between the average gray level and an actual measurement value obtained by actually measuring the basis weight of the sheet tobacco, the converter converting the average gray level into the basis weight of the sheet tobacco with reference to the conversion map.Ģ.
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