| 摘要 |
PROBLEM TO BE SOLVED: To provide the subject apparatus having a simple structure, exhibiting a high accuracy, and capable of quickly detecting the state of clogging by placing an optical sensor-type clogging detector which detects clogging in a tube for flowing down rice seeds. SOLUTION: This apparatus is constructed in such a manner that rice seeds are directly seeded on a field through a tube 21 for flowing down rice seeds from a rice seed hopper, and an optical sensor-type clogging detector 32 which detects the state of clogging in the tube 21 for flowing down rice seeds by intercepting light path is attached on the tube. Further, the above-mentioned clogging detector 32 can be placed on the upper-side inner wall of the tube 21 for flowing down rice seeds which is placed in an inclined state. Furthermore, a hood 34 can be placed so that the rice seeds which flow down near the upper- side position where said clogging detector 32 is placed by-pass the detecting means 32. |
