Automatic filling and packaging device

An automatic filling and packaging device comprising:

• a pusher member that fills an article to be packaged from an opening end portion of a packaging bag while pushing the article to be packaged;
• a locating means that locates the article to be packaged in a state where the article to be packaged is filled into the packaging bag with the pusher member;
• a plurality of gusset nails that fold the opening end portion of the packaging bag into a gusset shape after the article to be packaged is filled into the packaging bag with the pusher member;
• and
• a blade-equipped sealing device that cuts an extra portion of the packaging bag on a tip side while sealing the portion folded with the gusset nails into the gusset shape,
• wherein the locating means, the gusset nails and the blade-equipped sealing device are formed into a unit as a unit main body,
• the unit main body and the pusher member are formed to be able to freely move close to and apart from each other, and
• an operation control means configured to control to fold the opening end portion of the packaging bag into the gusset shape by the gusset nails when the pusher member completely moves backward from the interior of the packaging bag in the process in which the gusset nails of the unit main body and the pusher member are apart from each other.