| 摘要 |
A bridge crane (10) is automated by using tractor-driven end trucks (15) that move a passive loop of a cog belt or chain (25) wrapped around an encoder (30) to determine movements to predetermined positions. A controller (40) communicates with the encoder (30) and with a positional sensor (41) arranged on the course of end truck (15) movement to calibrate the encoder (30) and power the tractor drive (20) to produce positional accuracy for automation purposes. |
