Bottom material folding mechanism of bag making machine

摘要

An apparatus is arranged to successively make plastic bags. The apparatus comprises a trapezoidal plate (4) including a short edge (6) having opposite ends from which opposite oblique edges (8) extend divergently. The trapezoidal plate (4) comprises a double walled structure in which clearance means (10) is formed between walls. The apparatus further comprises drive means by which the trapezoidal plate (4) is moved in a direction of height of trapezoid so that the short edge (6) can be engaged with the bottom gusset material (2). In addition, the apparatus comprises a pair of folding plates (24) arranged to be engaged with the bottom gusset material (2) and then inserted into the clearance means (10) at positions corresponding to the oblique edges (8) in accordance with the movement of the trapezoidal plate (4) so that the bottom gusset material (2) can be inserted into the clearance means (10) by the folding plates (24) to be folded into halves along the short edge (6) and folded into the clearance means (10) along the oblique edges (8). The bottom gusset material (2) is then inserted between the pair of panel portions (44). IMAGE