| 摘要 |
A machine and method for making bags from two webs of film material with the bag being provided with a fitting having an access passageway therethrough and a flange that is heat sealed to the inner side of one wall of the bag. The two webs are advanced step by step from a feed station, the movement during each step being for lengths of the webs sufficient to provide portions for making a bag. The movement of the web is through successive stations with one web underlying an upper web. In the first of the successive station fittings are fed into a trackway having a downwardly sloped portion and a horizontal portion extending below the upper web. A hole is punched in the upper web and at the end of the horizontal position of the trackway is provided which serves to receive and align the fitting with a hole in the upper web, during a pause in the advancing movement of the webs. The elevator serves to elevate the fitting to a position within the aligned hole and then the flange of the fitting is heat sealed to the underside of the upper web while the fitting is elevated. Thereafter the upper and lower webs are progressed with the attached fitting to a bag forming station where the web portions are superposed and the margins heat sealed to form a bag.
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