| 摘要 |
This tracing apparatus (11) comprises two tracers (18, 27), which comprise a fine tracer (18), which is brought to bear against the bottom of the bezel of a frame ring (1) and which executes a revolution around the said frame ring in order to determine its form in space, and a second tracer (27), the profile of which matches that of the groove of the bevelling wheel. The difference in penetration of the pointed tips of the two tracers at the same point on the periphery of the bezel is measured in this way, and the corresponding information is sent to the grinding machine in order to control the glass-carrying carriage.
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