果実の機械収穫に関する研究 (第2報)
オウトウ果実の振動脱離特性
1974 年 36 巻 1 号 p. 126-131
詳細
1974 年 36 巻 1 号 p. 126-131
In this study, some laboratory experiments were carried out to investigate the removal characteristics of cherries from the spur by vibration.
The used branch segments had one spur with (A) one fruit without leaves, with (B) several fruits without leaves and with (C) several fruits and leaves, respectively. The branches were given certain harmonic vibrations. A high speed camera (600pps) was used to observe the behavior in motion of fruits and leaves during vibration. The main results are as follows;
1. In the case of (A), the number of reciprocation required for the removal of fruits was very different, however, most of fruits were removed in no more than 0.2sec, under both the conditions of 2cm (stroke) and 1200cpm (frequency) and of 6cm and 600cpm.
2. In the cases of (B) and (C), the time required for the removal of the first fruit was almost equal to that in (A). Most of the time required for the removal of all fruits were below 1.5sec.
3. No relationship was found between the maturity and the time equired for the removal of all fruits in this experiment.
4. The sum of time when a fruit stem was being strained by lateral tension during vibration was mostly below 30% of the total time required for the removal of a fruit.
5. The behavior of a fruit during vibration in the case of (A) was classified into six patterns as shown in Fig. 5.
6. The behaviors of fruits and leaves during vibration in the cases of (B) and (C) were so complex that any regular patterns might not be found for the motions of fruits and leaves.
