网格划线机毕业论文外文翻译（可编辑）.doc

毕业设计外文资料翻译 题 目 网格刻线机 学 院 机械工程学院 专 业 机械工程及自动化 班 级 机升1002班 学 生 张静 学 号 20100404071 指导教师 苏东宁 二〇一二 年 四 月 二 日
United States Patent OfficeSerNo739123 GRID RULING MACHINE John T Ferris Houston Tex United States Patent Office Abstract This invention relates to grid ruling machine and more particularly to apparatus for effecting an accurate transverse ruling of a grid blank of extensive length Key words grid ruling machine GRID RULING MACHINE John T Ferris Houston Tex assignor to Dresser Indhustres Incorporated Dallas Tex a corporation of Delaware Filed June 2 1958 Ser No 739123 11 C1aims Cl 88-24 This invention relates to grid ruling machine and more particularly to apparatus for effecting an accurate transverse ruling of a grid blank of extensive length In the past grids have been ruled by machines using conventional mechanical drives and stop and start controls in conjunction with a reciprocating mechanical scribing carriage However it is apparent that the numerous increments of short movement of the carriage interrupted by a complete stop during the operating stroke of the scribing carriage permits a repeated back lash or play between the machine elements within the limits of manufacturing tolerances Since perfect accuracy in the design and construction of conventional machine elements is unattainable evenmore small errors in scribing are multiplied with repetition so that grids scribed by such machines are necessarily limited in length More recently interferometers have been employed to control the longitudinal increment of movement of the scribing carriages but since interference fringes lose their brilliance and contrast to an unusable level beyond certain minimum limits of movement grids of more than a few centimeters in length cannot be produced under conventional interferometer control It is the