| 摘要 |
<p>A waterjet cutting head for cutting a moving sheet has a base plate and a cover plate positioned over the base plate. The cover plate includes an upper support surface for supporting the sheet and has depending chamfered sidewalls extending downwardly to the base plate to define a chamber. The upper support surface includes two matrix arrays of circular shaped suction apertures through which air is drawn by a fluid motor to draw the sheet into flat engagement with and over the upper support surface. A waterjet emitting aperture is located in the upper support surface between an upstream suction aperture and a downstream suction aperture in a first general direction relative to sheet travel. A waterjet nozzle is positioned in the chamber below the waterjet emitting aperture for directing a waterjet through this aperture to cut through the sheet. The upstream aperture is positioned partially offset in a direction orthogonal to the first general direction relative to the downstream suction aperture. The waterjet emitting aperture is aligned with a portion of the upstream suction aperture in the first general direction and is offset from the downstream suction aperture in a direction orthogonal to the first general direction. Consequently, the sheet is drawn by the upstream aperture over the waterjet is cut and only an uncut portion of the sheet is supported by the downstream aperture. The sidewall of the cover plate in the downstream direction of sheet travel has an exit aperture through which air is exhausted from the chamber. The base plate has a flat surface extension beyond the exit aperture about which the sheet follows. The exhausted air and flat surface extension further support the cut sheet portion.</p> |
