[Object];To improve an operability by eliminating a step of peeling off a separable strip from a sheet piece S' before the sheet piece S' is wound around wires of a wiring harness.;[Solution];Sheet pieces S' necessary to assemble wiring harnesses W on the respective harness assembling boards A are recognized based on the harness assembling boards, and the sheet S from a sheet roll So is cut to specified lengths in accordance with a recognition signal and the cut sheet pieces S' are supplied to the respective harness assembling boards A by being dropped thereon. A sheet cutting apparatus 20 is provided with a sheet feed roller 22 for feeding the sheets S from the sheet rolls So, pressure rollers 23 movable to and away from the feed roller 22 with the sheets S located therebetween, and cutters 26 for cutting the sheets S. In accordance with the recognition signal, the feed roller 22 is rotated, the pressure rollers 23 are pressed against the feed rollers 22 while the sheets S are fed by specified lengths, and the cutters 26 cut the sheets S fed by the specified lengths into sheet pieces S'. Therefore, in a production line, a desired number of sheet pieces can be supplied to the specified harness assembling boards by cutting the sheets from the sheet rolls when they are necessary.
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