Expand-and-constrict style band guiding device for a strapping machine

An expand-and-constrict type band guiding device for a strapping machine, said band guiding device comprising:

• An expand-and-constrict unit having an elongate fix member fixed on a bottom of a strapping machine and plural elongate slide members fitted in said fix member to telescope each other, and an elongate shift member telescopically fitted in one of said elongate slide members;
• An elastic coiled rod positioned properly on said expand-and-constrict unit and shaped as U, having a first end connected to an inner end of said shift member and a second end;
• A receiving member fixed on a proper location of said strapping machine, said second end of said elastic coiled rod extended into said receiving member,
• A roller unit having two rollers facing each other, said two rollers fixed with shafts on said strapping machine at two sides of said elastic coiled rod, said two rollers sandwiched said elastic coiled rod and move it in a preset direction so that said shift member may be extend outward or retreat inward;
• A clamp device fixed on a proper location of the bottom of said strapping machine for clamping the end of a strap band passing over a pushing location of said expand-and-constrict unit, said shift member pushing said strap band out for a preset distance, said clamp device releasing said band in due time so that the end of said band may be continually pushed to another side of a storage board for an operator of said strapping machine to conveniently catch hold of the band for subsequent work.