| 摘要 |
PCT No. PCT/US83/01553 Sec. 371 Date May 14, 1984 Sec. 102(e) Date May 14, 1984 PCT Filed Sep. 29, 1983 PCT Pub. No. WO84/01330 PCT Pub. Date Apr. 12, 1984.A drafting machine has fixed parallel top and bottom rails (R-1,R-2) and a center rail (R-3) which is movable perpendicularly along the fixed rails and has a carriage (4) carrying a protractor head (6) which in turn carries a straight edge assembly (2) including two mounting bars (30,40) perpendicular to one another and each having a reference scale (52) and an adjustable scale (54). The mounting bar (40) is movable along the mounting bar (30) and has an X-axis straight edge (64). A Y-axis straight edge (62) is movable along the mounting bar (40). Fine adjustment mechanisms (80) are provided on the center rail (R-3), the carriage (4), the mounting bar (40), and the Y-axis straight edge (62), which operate with racks (144,145) along the top and bottom rails (R-1,R-2), a rack (152) on the center rail (R-3), and racks (84) on the mounting bars (30,40). The fine adjustment mechanisms (80) may be readily disengaged.
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