| 摘要 |
A machine for manufacturing a base-unit (4) intended for an illuminated sign provided with a plurality of photodiodes, comprising a stand or support structure on which the base-unit is firmly fixed, an aperture-forming device (5) located on one side of the base-unit, a counterforce device (6) located on the other side of the base-unit, means for movement of the aperture-forming device and the counterforce device in relation to the base-unit (4), and control means which functions to stop the relative movement at pre-determined coordinate values in a right-angle two-dimensional coordinate system. The aperture-forming device (5) comprises a rotatable milling tool or like cutting tool. The milling tool (5) is arranged to be displaced forwards towards the counterforce device (6) to an extent such that the length or depth (a) of the circular aperture (40), seen from the rear side (4b) of the base-unit, will be constant or substantially constant irrespective of the thickness (8mm) of the base-unit. |
