US 5,027,484 A · Tension controller for warping machine and warping method

Abstract

A tension controller for a warping machine maintains a constant yarn tension during a warping operation from the beginning to the end of the warping operation. The tension controller has a brake force control mechanism (240) for controlling the size of the tension applied to the running yarns, and a yarn speed control mechanism (290) for controlling the running speed of the yarns. The brake control input, which is supplied to the yarns brakes, and the running speed of the yarns are so controlled that the actual yarn tension conforms to set or desired tension. When the diameters of the yarn packages are relatively large, a brake force is applied to the yarns, which run at a constant speed, thereby maintaining a constant yarn tension. When the diameters of the yarn packages are relatively small, on the other hand, a constant yarn tension is maintained by reducing the running speed of the yarns while supplying a zero or constant brake force to the yarns.

Claims10

Dependent claims

A tension controller for a warping machine for maintaining a constant tension of running yarns during a warping operation wherein a number of yarns drawn out from a respective number of packages is symmetrically arranged and wound on a warper's beam or drum, said tension controller comprising:

brake force supply means (4, 250) for applying a brake force to said running yarns within a predetermined range of a brake control input for increasing yarn tension;
tension measuring means (220) for measuring an actual tension of said running yarns;
set tension storage means (211) for storing information representing a desired yarn tension;
tension comparing means (10, 280) for comparing said actual yarn tension measured by said tension measuring means with said desired yarn tension stored in said set tension storage means to provide a yarn tension difference signal;
brake control input judging means (260) for judging whether or not an actual brake control input to said brake force supply means has reached a limit within said predetermined range and to provide a respective brake control reference signal;
brake force control means (240) for controlling the value of said brake control input to said brake force supply means (4, 250) to remove a difference between said actual yarn tension and said desired yarn tension in response to said yarn tension difference signal provided by said tension comparing means and in response to said brake control reference signal signifying that said actual brake control input has not yet reached said limit;
and
yarn speed control means (9A, 10, 290) for controlling the running speed of said yarns to remove a difference between said actual yarn tension and said desired yarn tension in response to said yarn tension difference signal and in response to said brake control reference signal signifying that said actual brake control input has reached said limit.

5 more elements

Dependencies are inferred from the claim text.

Tension controller for warping machine and warping method

Life of this patent

Tension controller for warping machine and warping method

Life of this patent

Abstract

Claims10