Provided is a bag-making, filling and packaging machine capable of reducing energy loss without reducing throughput. A bag-making, filling and packaging machine includes a cylinder-making unit that forms a band-shaped packaging material into a cylindrical shape, a conveying device that conveys the cylindrical band-shaped packaging material, a first sealing device that seals an overlapped end of the band-shaped packaging material, a second sealing device that seals both sides of the band-shaped packaging material that is formed into a cylindrical shape and contains a product, An operation control device that controls operations of the conveying device, the first seal device, and the second seal device, a battery that charges and discharges electric power, The method comprising: Charging the battery with energy generated by at least one of the first seal device and the second seal device as electric power; and supplying the electric power charged to the battery to the conveying...

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