Method of transferring strip-like plastics bag material in packing machine
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United States of America Patent
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Jun 29, 1982
Grant Date -
N/A
app pub date -
May 16, 1980
filing date -
May 17, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention provides a method of transferring a strip-like plastic bag material in a packing machine. The method comprises the steps of transferring the bag material by a pair of intermittently operated pinching rollers. The bag material comprises a series of interconnected bags each having a heat-sealed bottom portion with a flap-like margin. The flap-like margin is raised during transfer of the bag material by guide means. The bottom portion is then detected by means of a microswitch having an elongated contact adapted to be releasably engaged with the flap-like margin as the flap-like margin is raised by the guide means during transfer of said bag material. The bag material is then stopped for a packing operation in response to detection by the microswitch of the bottom portion.
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