| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reduction scale ruler with which a dimension value can be acquired without use of electric power even when a reduced scale of a drawing is unknown, based on shape and dimension value of a figure shown in the drawing. <P>SOLUTION: A reduction scale ruler includes: a scale sheet having a plurality of line segments provided thereon so that neighboring spaces can be reduced or enlarged in a constant ratio; a measurement portion which can place a part of the line segments near a measured portion along a direction orthogonal to a movement direction of the scale sheet; two rollers which are arranged in parallel and are independently rotatable from each other; and operation means which is rotatable by selectively engaging one of the rollers thereto. One end and other end in a longitudinal direction of the scale sheet are respectively wound around the two rollers, and the scale sheet is rolled up on one of the rollers by the operation means. <P>COPYRIGHT: (C)2012,JPO&INPIT |
