Presses – Binding – Methods
Patent
1976-01-21
1977-09-27
Wilhite, Billy J.
Presses
Binding
Methods
100 26, 100 33PB, 156 735, B65B 1302
Patent
active
040503720
ABSTRACT:
An automatic strapping machine is disclosed wherein strap is fed at a high rate of speed about a package so as to form a loop which is then tensioned and sealed. The loop is formed so that the leading end of the strap is overlapped by a trailing end of the strap and the resulting overlapped strap portions are joined together so as to form a seal which is not susceptible to snagging. The distal end of the overlapping strap end portion is urged against and is moved back and forth relative to an underlying strap portion in tension at a high rate of speed so as to generate heat therebetween and to form a friction-fused joint. During joint formation the strap loop about the package is in tension, but the strap end portion overlapping the loop is relaxed, i.e., not in tension.
Sealing energy generating means is adapted to engage the distal end of the overlapping strap end portion and comprises a pivotable anvil and a rotatable - oscillatable hammer adapted to receive overlapping strap regions therebetween, and an oscillating motor means for the hammer which engages the loop-over-lapping strap end portion and rubs the overlapping end portion against the underlying strap region at a rate sufficient to melt an interface region therebetween and to form a friction-fused joint when energized by the oscillating motor means.
REFERENCES:
patent: 3331312 (1967-07-01), Leslie et al.
patent: 3442203 (1969-05-01), Kobiella
patent: 3442732 (1969-05-01), Stensaker et al.
patent: 3442733 (1969-05-01), Vilcins
patent: 3442734 (1969-05-01), Ericsson
patent: 3442735 (1969-05-01), Stensaker
patent: 3494280 (1970-02-01), Kobiella
patent: 3548740 (1970-12-01), Kobiella
Signode Corporation
Wilhite Billy J.
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