| 摘要 |
PROBLEM TO BE SOLVED: To simply move a shutter plate even when foreign matter is caught between the shutter plate and a base plate in sliding the shutter plate to change an opening.SOLUTION: A fertilizer spreader 1 includes: a hopper 2 for storing a fertilizer 6; a base plate 31 having an opening part 32 for discharging the fertilizer 6 stored in the hopper 2; a shutter plate 33 having an adjusting opening part 35 for changing an opening of the opening part 32; and driving means 4 for sliding the shutter plate 33. When the stop state of the shutter plate 33 is detected by an encoder 43, the shutter plate is backed up in the coming direction (a second direction) by backup control means, foreign matter 61 is removed by stirring means, and the shutter plate 33 is turned by retry control means to be slid in a first direction. |
