Package making – Partial cover application – Band or tube
Patent
1988-03-31
1990-07-03
Sipos, John
Package making
Partial cover application
Band or tube
53582, 100 26, 100 33PB, 242 752, B65B 1306, B65B 1318
Patent
active
049380095
ABSTRACT:
A package strapping machine draws a thermoplastic strap off of a reel, loops the strap around a package, clamps a leading end of the strap, and then tightens the strap around the package with a strap tightening mechanism. A trailing end of the strap is cut underneath the leading end, and then both these ends are automatically welded together. When the strap is tightened, a portion of the strap is fed back towards the reel. The reel is provided with a device for rewinding this portion of the strap. A spiral spring stores energy from the rotation of the reel when the strap is drawn off, and when the strap is fed back the spiral spring causes the reel to rotate so as to rewind the strap. Because the strap is fed back towards the reel faster than the reel can rewind the strap, a loose strap portion accumulates between the reel and the strap tightening mechanism. A case stores the loosened portion between the reel and the strap tightening mechanism, and is provided with a resistor to tension the strap moving from the case to the reel. The rewinding speed of the reel can thus be controlled by the resistor, to allow the strap to be exactly and smoothly rewound.
REFERENCES:
patent: 2993659 (1961-07-01), Johnson
patent: 3057289 (1962-10-01), Luthi
patent: 3647128 (1972-03-01), Shah
patent: 3672595 (1972-06-01), Jablin
patent: 4030678 (1977-06-01), Simpson
patent: 4172565 (1979-10-01), Zaffarano
patent: 4177724 (1979-12-01), Johnson
patent: 4534817 (1985-08-01), O'Sullivan
patent: 4559767 (1985-12-01), Takami
patent: 4575994 (1986-03-01), Takami
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