The tensioning device utilizes a funneling structure to gather the tying medium, whether twine or tape or other material, into a prescribed volume while tensioning...http://www.google.com/patents/US4185548?utm_source=gb-gplus-sharePatent US4185548 - Tensioner device for package tying machineAdvanced Patent SearchPublication numberUS4185548 APublication typeGrantApplication numberUS 05/892,995Publi