| 摘要 |
<p>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. </p> |
