PROBLEM TO BE SOLVED: To enhance production efficiency by increasing operating ratio of a beam even when a replacement work of a component feeding unit is performed.SOLUTION: While a component feeding unit 13 of a component mounting apparatus 3 on a front side (an outer side of one) is being replaced, a beam 8 on the front side moves onto a side of a component feeding apparatus 5 on a rear side (an outer side of the other), a mounting head 11 moves between a printed board P on a carrying apparatus 2 and the component feeding apparatus 5 in a similar manner to a mounting head 10, and suction nozzles provided on each of the mounting heads 10, 11 pick up electronic components from the component feeding apparatus 5 and mounts the electronic components on the printed board P.
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