| 摘要 |
<p>The electric copy control installation is used on flame cutting machines. The edge-monitoring light receiver (33) is located above the centre line of the edge and on each side of the edge symmetry light receivers (34, 35) are provided. The two sets of light receivers work in conjunction with each other. An evaluating and control device (30) contains on averaging device receiving signals from the symmetry-light receivers. The averaging device is connected to the input of a differential amplifier via a store. The other input of the differential amplifier is connected with the edge-monitoring light receiver.</p> |
