| 主权项 |
1. An apparatus for successively making plastic bags each of which includes a panel portion, side gusset portions and a fastener portion, the apparatus comprising:
a panel material feeding device by which first and second webs of panel material are superposed with each other and fed longitudinally thereof; a fastener material joining device by which a first body of fastener material is joined to the first web of panel material while a second body of fastener material is joined to the second web of panel material before the first and second webs of panel material are superposed with each other, the first and second bodies of fastener material extending longitudinally of the first and second webs of panel material, the first and second bodies of fastener material being then interposed between the first and second webs of panel material and aligned with each other after the first and second webs of panel material are superposed with each other; a side gusset material supply device by which a web of side gusset material is withdrawn from a roll, folded into halves and supplied to the first web of panel material to extend widthwise of the first web of panel material before the first and second webs of panel material are superposed with each other, the web of side gusset material having a width, the web of side gusset material being then interposed between the first and second webs of panel material after the first and second webs of panel material are superposed with each other; and an additional joining device by which a third body of fastener material is joined to the web of side gusset material after the web of side gusset material is withdrawn from the roll and before the web of side gusset material is folded into halves and supplied to the first web of panel material, the third body of fastener material extending widthwise of the web of side gusset material and having a length corresponding to the width of the web of side gusset material, the web of side gusset material being then folded into halves and supplied to the first web of panel material so that the third body of fastener material is folded by the web of side gusset material and interposed between the first and second bodies of fastener material after the first and second webs of panel material are superposed with each other, the first and second bodies of fastener material being aligned with the third body of fastener material, the panel portion being formed of the first and second webs of panel material, the side gusset portion being formed of the web of side gusset material, the fastener portion being formed of the first, second and third bodies of fastener material. |
