可搬型茶摘採機の作業負荷軽減に関する研究(第1報)
茶葉重量の把持力への影響について
1994 年 29 巻 2 号 p. 83-89
詳細
1994 年 29 巻 2 号 p. 83-89
With the purpose of elucidating the influence of the harvested tea leaves weight and the tea plant height with portable type machine, the grasping forces of each finger in various tea leaves weight and tea plant height were measured. The obtained results are as follows.
1) With the increase of the tea leaves weight, the total grasping forces increased at blade side right handle and engine side left handle. The increasing ratio was 1.5 and 1.4 respectively with the increase of tea leaves weight from 0kg to 12kg. There was not particular influence at other two handles.
2) With the increase of the tea plant height, the total grasping force increased around 20% on the blade side and 25% on the engine side with the increase of the tea plant height from 70cm to 100cm.
3) The distribution percentages of each finger were not influenced neither by tea leaves weight nor the tea plant height. The average percentages were on the 2nd finger 15.1%, on the 3rd finger 30.1%, on the 4th finger 35.5% and on the 5th finger 19.3%.
4) In consideration of the original grasping ability, the 2nd finger contributes a little while the 4th finger contributes too much in tea-plucking operation.
5) The supporting force of the additional operator against the tea gathering bag was around one third of the tea leaves weight.
6) For the labour burden reduction of tea-plucking operation, the operators are expected to rotate to reduce the accumulated burden and the plucking machine should be designed to be adjustable for various tea plant height.
