Existing Japanʼs first Electric milking machine “DK-5 II”

This device is the first domestically produced electric milking machine in Japan, and was developed by Kyoei Seiki Co., Ltd. in 1957 referencing the construction of imported milking machines. It accomplished milking by attaching a two-layer milking section with a liner inserted into a stainless steel cup to the teat of a cow, and sucking milk by depressurizing the inside of the liner. In addition, it would operate intermittently by alternately switching between atmospheric pressure and vacuum in the space between the liner and the cup at a frequency of approximately 40 times per minute. Sanitation was considered in the machining of the device. Dairy farmers were thus relieved from the heavy labor of hand squeezing, which also contributed considerably to promoting public health.