Yarn tester system
AssigneeLawson-Hemphill, Inc.
InventorJohn B. Lawson
Life of this patent
Estimating the term…
Abstract
A yarn tension control for a yarn testing machine includes: a support; a carriage moveable relative to the support; and a tension arm pivotably mounted to the carriage for engaging the yarn. The tension arm is set in a neutral position to apply a predetermined tension to the yarn. Rotation of the arm indicates an incremental change in the yarn tension. Upon such a change in tension the carriage is moved from an initial position to a compensating position to re-establish the predetermined tension. The drive elements then vary the speed of the yarn to produce an offsetting incremental change in the yarn feed rate to restore the tension arm to its neutral position.
Claims32
A yarn tester system comprising:
- heater means for inducing a change in length of yarn to be tested;
- first means for feeding yarn to be tested to said heater means at a first predetermined tension;
- first means for sensing a function of the amount of yarn transferred by said first means for feeding;
- second means for feeding yarn for receiving yarn from said heater means;
- second means for sensing a function of the amount of yarn transferred by said second means for feeding;
- third means for feeding yarn for receiving yarn from said second means for feeding;
- third means for sensing a function of the amount of yarn transferred by said third means for sensing;
- first yarn tension control means for establishing a second predetermined tension on said yarn between said first and second means for feeding and controlling the speed of said second means for feeding to maintain said second predetermined tension;
- second yarn tension control means for establishing a third predetermined tension on said yarn between said second and third means for feeding and controlling the speed of said third means for feeding to maintain said third predetermined tension;
- and
- means, responsive to said first, second, and third means for sensing, for determining fiber shrinkage and recovery of the yarn which has been transferred between the first, second, and third means for feeding.
A yarn tension control means for a yarn testing machine having means for varying the speed of a yarn feeding device, comprising:
- support means;
- a carriage movable relative to said support means;
- a tension are pivotably mounted to said carriage and having means for engaging the yarn;
- means for setting the tension arm in a neutral position to apply a predetermined tension to the yarn;
- means, responsive to rotation of said arm, for indicating an incremental change in yarn tension;
- means, responsive to said means for indicating, for moving said carriage from an initial position to a compensating position to re-establish said predetermined tension;
- and
- means, responsive to the motion of said carriage, for driving said means for varying the speed of a yarn feeding device to produce an offsetting incremental change in yarn feed rate to restore said tension arm to its neutral position.
A yarn tension control means comprising:
- support means;
- a carriage movable relative to said support means;
- a tension arm pivotably mounted to said carriage and having means for engaging the yarn;
- means for setting the tension arm in a neutral position to apply a predetermined tension to the yarn;
- means, responsive to rotation of said arm, for indicating an incremental change in yarn tension;
- and
- means, responsive to said means for indicating, for moving said carriage from an initial position to a compensating position to re-establish said predetermined tension.
Dependencies are inferred from the claim text.