Length measuring instrument

G - Physics – 01 – B

Patent

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Details

G01B 5/02 (2006.01) A61B 5/107 (2006.01) G01B 3/10 (2006.01) G01D 5/36 (2006.01)

Patent

CA 2505000

A length measuring instrument capable of measuring, displaying and recording the length around a part being measured by applying a measuring belt tightly to that part and operating the instrument by single hand. A rotary shaft (20) disposed in a housing (10) is provided with a spiral spring (40), the measuring belt (30), and an optical modulating section (100) having a part (104) for regulating the quantity of transmitted light. The belt is drawn out and applied tightly to the circumference of the part being measured. The rotary shaft is rotated forward when the belt is drawn out and rotated reversely by the recovering force of the spring to pull in the belt automatically thus, stretching and tensioning the belt. The light is converted into an optical modulation signal L depending on the rotation of optical modulating section and that signal is converted temporarily into a photoelectric conversion signal before being converted into an electric signal. The pulse generation pattern is judged at the forward/reverse rotation judging section (238) of a CPU (230), addition and subtraction counting is performed at the pulse counting section (236) in response to the judgment results, and the value of a length corresponding to the final count is read out from the storage device (222) and displayed at a display section (226).

L'invention concerne un instrument permettant de mesurer, d'afficher et d'enregistrer la longueur circonférentielle d'un élément à l'aide d'une courroie de mesure que l'on applique autour de cet élément et que l'on actionne d'une seule main. Un arbre rotatif (20) placé dans un boîtier (10) est pourvu d'un ressort spiralé (40), la courroie de mesure (30) et une section de modulation optique (100) ayant un élément (104) destiné à la régulation de la quantité de lumière transmise. On tire sur la courroie et on l'applique sur la circonférence de l'élément à mesurer en la serrant. L'arbre rotatif tourne dans le sens d'avancement lorsque l'on tire sur la courroie et tourne dans le sens inverse sous l'action de la force de rappel du ressort pour automatiquement enrouler et tendre la courroie. La lumière est convertie en un signal L de modulation optique en fonction de la rotation de la section de modulation optique et ce signal est converti temporairement en un signal de conversion photo-électrique avant d'être converti en un signal électrique. Le motif de génération d'impulsion est évalué au niveau de la section d'évaluation de rotation avant/arrière (238) d'une unité centrale (230), l'addition et la soustraction sont effectués à la section de comptage d'impulsions (236) en réaction aux résultats d'évaluation, et la valeur d'une longueur correspondant au compte final est lue dans le dispositif mémoire (222) et affichée à la section d'affichage (226).

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