A cutter is provided with a pair of squeezing rolls which is oppositely located and horizontally movable, and a pair of heat sealing means which is oppositely located under the squeezing rolls at a distance necessary for heat sealing and horizontally movable. A cutting means is provided immediately underneath the heat sealing means at a distance equivalent to the width of a sealed portion. The pair of squeezing rolls is provided with a means to intermittently rotate the rolls to move a packed bag.
