| 摘要 |
<p>Cropping is effected by means comprising a cutting element consisting of a mobile metal wire (2) wound around at least two rollers (4, 5) to form at least two superimposed layers (6, 7) of parallel strands. A to-and-fro movement between a delivery bobbin (3) and a take-up bobbin (8) may be imparted to the cutting element. The bar (1) rests on a support (16) located outside the cutting element below the lower layer (7) and is brought into contact with the layer (7) and pressed against it for cropping by a continuous upward relative translational movement of the support with respect to the layer (7). Application to cropping bars of silicon and other hard materials, in particular those which are anisotropic about their growth axis.</p> |
