| 摘要 |
A draw control system for a process line is provided wherein the process line comprises a number of stand or sections having the speeds N1, N2-Nn. The stands are provided with a master reference voltage V which may be modified at each section to change its speed to Nn+ DELTA Nn where n=1-2, 3-n. One section is selected as a no-draw section, i.e., the master voltage is applied without change to the speed regulator for that section to determine its speed, say N1. All succeeding sections comprise non-inverting summation operational amplifiers arranged in cascade respectively so that the output of one determines the speed for its section and this output is also applied to the input of the non-inverting summation amplifier for the succeeding section. With this arrangement all perturbations ripple on through the draw control system so that interstand tension is maintained under all conditions. Thus, if the master reference voltage is changed to V+ DELTA V then <IMAGE> and if Nn-2 is changed to Nn-2+ DELTA Nn-2 in order to increase the interstand tension between stands Nn-2 and Nn-1 then the speed Nn is changed to DELTA Nn+ DELTA n and DELTA Nn= DELTA Nn-1 . The input to the each cascaded non-inverting summation operational amplifier includes a scale factor or multiplier K which sets the range for the change in speed for each section respectively.
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