Square bottom sealable bag forming machine

An improved machine for making a bag having a front face with a lower edge, a back face with a lower edge, a bottom with peripheral edges, and a pair of gusset sides with lower edges, and being of the type having a frame, an upper mandrel, a lower mandrel with an upper position and a lower position, and sealers, said improvement comprising:

• the lower mandrel having a pair of long plates and a pair of short side plates;
• each of the two long plates of the lower mandrel has a cut-out section and each of the two short side plates of the lower mandrel has a pair of cut-out sections;
• said cut-out section of each of the two long plates of the lower mandrel selectively accommodate the sealers when the lower mandrel is in the lower position thereof allowing sealing of the lower edge of the front face of the bag with an associated peripheral edge of the bottom of the bag and the lower edge of the back face of the bag with an associated peripheral edge of the bottom of the bag;
• said pair of cut-out sections in each of the two short side plates of the lower mandrel selectively accommodate the sealers when the lower mandrel is in the lower position thereof allowing sealing the lower edges of the pair of gusset sides of the bag with a pair of associated peripheral edges of the bottom of the bag so as to allow the bag to be sealed where the gusset sides of the bag meet associated peripheral edges of the bottom of the bag instead of the bottom of the bag proper.