| 摘要 |
A plate (5) fixed in the bench mark has several geometrical reference parts (18) which move vertically between a lower and upper position. These parts are divided in as many sets of parts as exist different pieces to be placed in the marker. The reference parts are each manoeuvred between their two positions by an actuator (6-13). These actuators have a telescopic body between a base plate and an upper plate which takes a specific reference tool (18). Control and synchronisation of the movement of the other movable parts of a same set comprises a fixed actuator connected to the upper plate by a supple strap movable in a sheath.
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