In-line package strapping system

Details In-line package strapping system In-line package strapping system

1989-06-12

1991-02-05

Sipos, John

Package making

With contents treating

Reshaping

53530, 53586, 53588, 100 7, B65B 1304, B65B 6302, B65B 2708

Patent

active

049893971

ABSTRACT:
An in-line strapping system which is particularly adaptable for strapping a compressible stack of sheet material includes a stack feeding mechanism which captures and holds the stack with its vertical side faces squared through the strapping cycle. A pair of vertically disposed compression belts captures the stack fed from an upstream squaring mechanism and feeds the stack into a strapping station to partially encircle the stack with a strap disposed in the path of movement. Only one lateral side of the stack is captured between the compression belt such that the stack is held in cantilevered fashion in the strapping station with the opposite lateral side unsupported. A rotary strap arm supports the partially wrapped strap and carries it around the unsupported rear portion of the stack to a sealing position overlapping the free end of the strap beneath the stack. A heat sealing apparatus seals the overlapping portions of the plastic strap, simultaneously cuts the strap to provide a new free end and clamps the new free end in a preliminary holding position. The strapped stack exits the system and the rotary strap arm continues in the same direction to an upper position and repositions the strap in the path of the next incoming stack. The heat sealing apparatus and associated strap clamping mechanism are operated by a common camshaft adapted to provide one complete operating cycle in a single revolution. The unidirectional rotation of the rotary strap arm allows the use of a much simplified strap clamping mechanism.

REFERENCES:
patent: 2982063 (1961-05-01), Coleman
patent: 3766708 (1973-10-01), Kubo
patent: 3930442 (1976-01-01), Buttner
patent: 4178739 (1979-12-01), DuBroff
patent: 4738078 (1988-04-01), Benz

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