移植作業における組作業者数と移植機または作業者の稼動時間の関係

抄録

In Japan, use of transplanting machines has been tested for vegetable crops like cabbages. In such cascs, however, attention was payed mainly to efficiency of machines but not to overall efficiency of workers when taking account of hand work of pricking out seedlings.
In this report it was tried to calculate theoretically the working rate per day of transplanting machines under different numbers of workers on the supposition that a gang of workers performs both pricking out seedlings by hand and planting them by machines each day and that all members have the same hours of duty.
The working hours per day of a machine increase linearly when the number of workers increases, but level off beyond a certain gang, of which number of workers is estimated by N_P+(W_P/W_S), where N_P, number of planting workers on the machine; W_P, working rate of planting per hour per machine; W_S, working rate of pricking per hour per worker. Reverse is the case for the actual working hours of workers of a gang per day.
When overall efficiency of workers consisted of hand pricking and machine transplanting is expressed as working hours of machine per sum of hours of duty of a gang, it is directly proportional to per cent of hours of duty occupied by actual working hours of a gang. On the other hand, when expressed as working hours of machine per sum of actual working hours of a gang, overall efficiency maintains a constant value irrespective of different numbers of workers.