B - Operations – Transporting – 30 – B
Patent
B - Operations, Transporting
30
B
156/32.11
B30B 15/34 (2006.01) B29C 65/00 (2006.01) B29C 65/20 (2006.01) B65B 13/32 (2006.01)
Patent
CA 1141648
ABSTRACT There is disclosed a strapping machine for applying a plastic strap around an object, tensioning the strap and heat-sealing together overlapping portions of the strap, including a retractable heating member movable between the overlapping strap portions and a pressure-applying means including a pressure block with a tiltable universal joint coupling for pressing the overlapping strap portions against the heating element with a first relatively light pressure to melt the facing surfaces thereof. The heating element is withdrawn while the pressure-applying means presses the strap thereagainst with the first pressure, and then the melted strap portions are pressed together with a strong second pressure to complete the seal. A cam with a yieldable section controls the first pressure and a compression spring controls the second pressure. While retracted, the heating element is raised to a higher temperature for burn-off of strap residues. Switch means disposed in the strap path provide a positive stop to prevent strap overfeed while a yieldable track section permits escape of excess strap from the path to prevent jamming. Air filter means remove waste products of the heat- sealing operation.
353240
Middleton Charles G.
Mossell Alan T.
Simmons James R.
Cass Strapping Corporation
Hewitt Neville S.
LandOfFree
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