Abstract: An apparatus is arranged to successively make plastic bags. The apparatus comprises a trapezoidal plate including a short edge having opposite ends from which opposite oblique edges extend divergently. The trapezoidal plate comprises a double walled structure in which clearance means is formed between walls. The apparatus further comprises drive means by which the trapezoidal plate is moved in a direction of height of trapezoid so that the short edge can be engaged with the bottom gusset material. In addition, the apparatus comprises a pair of folding plates arranged to be engaged with the bottom gusset material and then inserted into the clearance means at positions corresponding to the oblique edges in accordance with the movement of the trapezoidal plate so that the bottom gusset material can be inserted into the clearance means by the folding plates to be folded into halves along the short edge and folded into the clearance means along the oblique edges.

Abstract: An apparatus is arranged to successively make plastic bags. The apparatus comprises a trapezoidal plate including a short edge having opposite ends from which opposite oblique edges extend divergently. The trapezoidal plate comprises a double walled structure in which clearance means is formed between walls. The apparatus further comprises drive means by which the trapezoidal plate is moved in a direction of height of trapezoid so that the short edge can be engaged with the bottom gusset material. In addition, the apparatus comprises a pair of folding plates arranged to be engaged with the bottom gusset material and then inserted into the clearance means at positions corresponding to the oblique edges in accordance with the movement of the trapezoidal plate so that the bottom gusset material can be inserted into the clearance means by the folding plates to be folded into halves along the short edge and folded into the clearance means along the oblique edges.