Studies on the Human Engineering of Harvesting and Transporting in Plastic House (III)

Motion and Time Study

Abstract

We performed the motion and time study of harvesting and transporting when used the cart for transporting and used the hand-basket that is customary working, by using model cucumber plan ting, The results were as follows:
(1) we prepered three kinds of designated model cucumbers which resemled real ones in size and hanged them on a model device together with other model cucumbers. After that, we let a person pick the designated model cucumbers.
The accuracy of picking incresed with increase of picking time but thers was a limit in the increase of picking accuracy. There was not very much change in the accuracy when the number of the designated model cucumbers was varied.
(2) The picking motion of the picker was classified into three groups, viz, the standing posture, the half sitting posture and the stooping posture.
The time of picking increased with increase of the number of designated model cucumbers and the increased time was roughly equal to the increase in time due to half sitting and the stooping motions.
(3) when the number of the designated model cucumbers increased, the number of times of each posture also increased. Above all the increase in the case of half sitting posture was remarkable.
(4) The coefficient of variation of time of the half sitting and the stooping postures was increased with increase of the number of designated model cucumbers. It showed that the time of above two postures became irregular with increase of the number of designated model cucumbers.
The relation between the number of designated model cucumbers and the coefficient of variation of time of the standing posture was not clear.
(5) The motion and time study showed no difference between applying a cart and the customary working methed. Therefore it may be concluded that the motion of a picker could not be simplified by using a cart.