| 摘要 |
An object of the present invention is to provide a control method for a box motion type end-sealing carried out by a longitudinal type or lateral type bag forming, filling and packaging machine, which can permit the end sealing time period to be set as long as possible even if a linear section (a sealing length of a predetermined stroke) is made constant. There is provided a method of controlling an end-sealing time period for a bag forming, filling and packaging machine. A packaging film is longitudinally sealed at its both film edges to provide a packaging cylinder, a film feeding device feeds the packaging cylinder downwardly and a box-motion type end-sealing (lateral sealing)/cutting device seals the packaging cylinder at two lateral rows, and cuts an intermediate position between the rows, one row being located at an upper side of a product to be packaged that is filled into the packaging cylinder, and the other row being located at a lower side of a product to be packaged that is to be filled into the packaging cylinder subsequently. The method is characterized in that servo-motors for forming box motion are controlled so that a sealing time period in a sealing distance of a predetermined stroke is controlled to be relatively longer. That is, during the box motion, the end-sealing heater is moved in a linear section slowly as long as possible, and moved relatively quickly in a returning section.
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