Patent ID: 7896282

Claim:
Apparatus for controlling the tension in a yarn, comprising: first means for measuring a first actual tension in a yarn at a first location proximate to a first region at which the yarn is unwound from a spool; means for regulating the first actual tension in the yarn at the first location to substantially equal a variable first set point; second means for measuring a second actual tension in the yearn at a second location proximate to a second region, distant from the first region, at which the yarn enters a textile machine for processing; means for comparing and calculating a difference, if any, between said second actual tension in the yarn at the second location and a predetermined fixed second set point; and means for modifying the first variable set point based on the difference, if any, between the second actual tension in the yarn and the second fixed predetermined set point so that said means for regulating the first actual tension in the yarn at the first location modifies the first actual tension in the yarn such that the value of the second actual tension of the yarn at the second location is substantially equal to the second fixed predetermined set point.