Tension And Compaction Controller

PURPOSE

Improvements in yarn package formation may be realized by controlling and, as the package builds, changing the yarn winding tension and the spindle-against-roller-bail pressure (compaction). The Tension Compaction Controller TCC-1 provides this programmable control by intelligently generating analog reference signal for the pneumatic pressure regulators that drive the linear-force-producing air cylinders which create the yarn tension and compaction force.

FUNCTION

The TCC-1 accepts an electrical pulse input that represents the accumulated measure of yarn as its wound. The TCC-1 also accepts a contact or open-collector closure input that indicates when winding is in progress. The TCC-1 is programmed by means of a keypad and display for beginning tension and compaction values, measure value where compaction and tension begin decreasing, ending tension and compaction values and their respective rates of decrease.

When the "winding in progress" input signal occurs the TCC-1 resets the measure (yards, meters, etc.) count to zero and then displays the increasing yarn accumulation. At the same time the tension output reference changes from the programmed string-up tension value to the programmed beginning tension value. The compaction output reference is at its programmed beginning compaction value.

When the "begin ramp measure" is reached both tension and compaction begin to "ramp" down in value. As winding progresses the tension value decreases linearly at its programmed decrease rate which determines when the tension value reaches its programmed "tension hold value" where it will remain throughout the rest of the package build. The compaction changes likewise in accordance with its own beginning, rate, and hold values.

When the "winding in progress" input signal ceases the display freezes with the accumulated measure, the compaction output returns to its beginning value, and the tension output returns to its string-up value.

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