【正文】 ht reflectors, movement of one of said reflectors relative to the other of said reflectors producing interference fringes on relative light and dark, said one reflector being mounted on said first carriage and said other reflector being mounted on said second carriage, a transducer for converting such fringes of relative light and dark into electrical pulses upon relative movement between said first and second carriages, means energizing said first carriage driving means, signal means connected to said transducer and operative upon receiving a first given number of electrical pulses for deenergizing said first carriage driving means and then energizing said second carriage driving means, said signal means being further operative upon receiving a second given number of electrical pulses to de energize said second carriage driving means and the n to energize said first carriage driving means. References Cited in the file of this patent UNITED STATES PATENTS 1,455,795 LoganMay 22,1923 1,744,642 KondoJan. 14,1930 1,814,701 IvesJuly 14,1931 2,123,276 EckerlinJuly 12,1938 2,506,141 DrouinMay 2,1950 2,527,338 StamnOct. 24,1950 2,575,367 StrongNov. 20,1951 2,702,393 MertonFeb. 22,1955 745,919 Great BritainMar. 7,1956 OTHER REFERENCES Jenkins and White,”Fundamentals of Optics,”second edition,1950 McGrawHill Book Co.,Inc.,New York,.,pages 247249.(C0py in ) 濟南大學(xué)畢業(yè)設(shè)計 外文資料翻譯 12 濟南大學(xué)畢業(yè)設(shè)計 外文資料翻譯 13 United States Patent Office, Ser. No. 739,123 網(wǎng)格劃 線機 John T Ferris, Houston, Tex. 摘 要 本發(fā)明涉及到網(wǎng)格劃線機，更特別是 ，此設(shè)備為得到準(zhǔn)確的橫向劃長度廣泛的空白網(wǎng)格給與保障。 我發(fā)明的另一個目的是提供一個劃空網(wǎng)格的新方法，即在工作臺實現(xiàn)運動時不需要啟動和停止設(shè)備。 of metal, glass plastic or the like. The grid blank 30 may be held stationary by any conventional fasteners, clamps or other holding means and disposed as shown with its longitudinal axis parallel to the ways 5 and 6 and its transverse axis perpendicular to the plane of the carriages 1 and 2. On the adjacent surface of the grid blank 30 is a coating 31 of a light sensitive emulsion requiring the maintenance of controlled conditions of area illumination to avoid inadvertent exposure. Mounted on carriage l to travel therewith is an elongate electronic flash tube 34 having its longitudinal axis disposed perpendicular to the plane of the carriage l and hence, parallel to the surface of the grid blank 30. the flash tube 34 has the surface thereof aluminized to prevent the transmission of light except through a narrow straight line slit 35 etched or scribed along the length thereof by accurate machine tool methods. Therefore each time the tube is flashed, a narrow, vertical bean of light is transmitted to and through a lens 35 a which focuses the beam to a narrow line of light impinging upon the light sensitive coating 31 to expose a fine line L transversely across the surface of grid blank 30. The flash tube 34 is energized upon closing of an appropriate switch in the control circuit :24 by the souro of stored electrical power of a conventional power supply and trigger circuit 36 and conductors 37. The control circuit is adapted to trigger the power supply each time a predetermined number of pulses are delivered by photoelectric cell 23 0nly during the movement of carriage 1. It is believed that the operation of my apparatus can now be readily understood. In response to appropriate signal the motor 8 is energized to move carriage 2 in advance of carriage l to set the grid ruling apparatus for operation. Throughout the movement of carriage 2, the power supply 36 is inactive. Then, carriage l is driven by motor 7 through a distance measured by a predetermined number of pulses delivered by photoelectric cell 23. Throughout this movement power supply 36 is operative and repeatedly on appropriate signal from control circuit 24 in response to a fixed number of pulses delivered thereto releases an electrical signal to energize the flash tube 34 and expose a narrow line on the face of grid blank 30. After exposure the light sensitive emulsion is processed by 濟南大學(xué)畢業(yè)設(shè)計 外文資料翻譯 7 conventional photographic techniques. In the case of extremely long grids the developing process can be performed with the grid still in position by manual application of developing chemicals. Again, while I have referred specifically to a motor and gear and rack drive for the carriage, it is obvious that many different types of drive means may be employed. It is significant only that start and stop means for the carriage be under the control of mechanism operated in response to signals generated by the interferometer 10. While I have shown a preferred embodiment of my Invention, it is apparent that m any modifications an changes may be made therein without departing from the spirit and scope of my invention which is defined by the claims appended hereto. Having described my invention, I claim : 1. Apparatus for ruling a grid blank prising, a grid marking device, first and second carriages independently movable along a fixed path parallel to said grid blank, said grid marking device being mounted upon said second carriage for movement relative to said grid blank, 39。驅(qū)動方式和停止方式可能被整合，用來提供每一個工作臺的獨立運動。 畢業(yè)設(shè)計外文資料翻譯 題 目 網(wǎng)格刻