| 摘要 |
When a sheet (10), e.g. of steel, is cut by a relatively moving, localised energy source such as the laser (3) beads of dross tend to accumulate on opposite sides of the cut on the side of the sheet (10) remote from the energy source (3). This dross subsequently has to be removed in a separate operation, e.g. by milling or grinding. To prevent the accumulation of dross the present invention provides a source (12) of gas under pressure which flows from a nozzle (13) across the underside of the sheet (10). The nozzle (13) remains stationary relative to the cutter (3) whether the sheet (10) moves in the direction of the arrow or whether, in a modification, the sheet (10) is clamped to remain stationary and the cutter (3) and nozzle (13) move in synchronism. <IMAGE> |
