| 摘要 |
<p>894,022. Cutting by fusion. UNITED STATES STEEL CORPORATION. Feb. 23, 1960 [March 12, 1959], No. 6369/60. Class 83 (4). [Also in Group XXIII] A rolled section beam 12 is positioned on a roller conveyer 10 by photo-electric cell means 23 which, on arrival of the beam at a predetermined position, stop the conveyer motor 11 and the beam is then cut to length by a torch 13. A light source 18 and four photo-cells 19, 20, 21, 22 control relays 25, 27, 28, 29 and are adjustably mounted so that the length cut can be varied. The first relay 25 is de-energized when the light falling on cell 19 is interrupted by the end of the beam 12 and it shunts a resistor 17a in the motor field circuit to slow down the motor. The beam continues to advance until it interrupts the light to the cell 20 and the de-energized relay 27 causes contaets 14a, 14b to open and stop the motor. Through a slow-acting relay, the torch is advanced to cut the work and is automatically returned. If the beam overshoots, relay 28 or 29 is operated and the motor 11 returns the beam at fast or slow speed until it is stopped when relay 28 is again energized. Switches are provided for operation of the conveyer at maximum forward or reverse speeds, by-passing the photo-cell control, and a take-off section 10a is constantly driven at a faster speed than the main conveyer by a motor 39.</p> |
