| 摘要 |
The guidance assembly includes a diode device (30, 130, 230) for emitting a vertical line of laser light (32). The assembly is characterized by an alignment mechanism for maintaining the vertical line of laser light (32) in parallel alignment with gravity to compensate for misalignment of the upright axis of the carriage (12) from vertical to maintain the vertical line of laser light (32) aligned with gravity as the carriage (12) moves over an uneven plot. In the first and second embodiments of Figures 2 through 5, the alignment mechanism includes a rotary motor (38 and 138), for rotating the diode device (30, 130) for rotating the vertical line (32) relative to the upright axis of the carriage (12). The third embodiment of Figures 6 and 7 implements the generic concept of maintaining the vertical line of light (32) aligned with gravity by an alignment mechanism including a leveling device (238) for maintaining the platform (28) perpendicular to vertical gravity and to move the vertical line (32) relative to the upright axis of the carriage (12). |
