US 5,002,095 A · Electronic control of terry pile warp yarn dispensing rate

Abstract

A terry loom having a negative pile warp let-off motor is electronically controlled to produce terry having uniform pile-to-ground warp ratio. The negative pile warp let-off motor is controlled to dispense pile warp yarn at a rate which yields the desired pile-to-ground warp ratio regardless of the tension on the pile warp yarn. The desired rate of pile warp let-off may be provided to the loom controller as a known quantity or may be calculated by the loom controller based upon the known desired pile-to-ground warp ratio and a measured or preset ground warp let-off rate. The desired pile warp let-off rate is compared to the actual pile let-off rate, and a signal is generated based upon deviations between actual and desired pile warp let-off rates, to control the pile warp let-off motor. Simplified control with uniform pile-to-ground warp ratio is thereby provided.

Claims41

Dependent claims

A terry loom comprising:

a first supply beam from which pile warp yarn is dispensed;
a negative pile warp let-off motor connected to said first supply beam, for dispensing said pile warp yarn from said first supply beam at a variable rate and under variable tension;
a second supply beam from which ground warp yarn is continuously dispensed;
a reciprocally operable read past which said pile and ground warp yarns are directed to weave terry;
means for sensing the variable rate at which the pile warp yarn is dispensed from the first supply beam, and for producing a first electrical signal responsive thereto;
and
electronic control means responsive to said first electrical signal, and to data representing a desired pile warp yarn dispensing rate, for producing an output signal determined by the difference between said first electrical signal and the desired pile warp yarn dispensing rate, independent of the variable tension on said pile warp yarn, and for applying said output signal to said pile warp let-off motor to control said variable rate at which the pile warp yarn is dispensed;
whereby pile warp yarn is dispensed by said negative let-off motor to produce the desired pile-to-ground warp ratio.

5 more elements

An electronic control system for a terry loom having a first supply beam from which pile warp yarn is dispensed, a negative pile warp let-off motor for dispensing the pile warp yarn from the first supply beam at a variable rate and under variable tension, a second supply beam from which ground warp yarn is continuously dispensed, and a reciprocally operable reed past which the pile and ground warp yarns are directed to weave terry, said electronic control system comprising:

means for sensing the variable rate at which the pile warp yarn is dispensed from the first supply beam, and for producing a first electrical signal responsive thereto;
and
electronic control means responsive to said first electrical signal, and to data representing a desired pile warp yarn dispensing rate, for producing an output signal determined by the difference between said first electrical signal and the desired pile warp yarn dispensing rate, said output signal being independent of the variable tension on said pile warp yarn, and for applying said output signal to said pile warp let-off motor to control said variable rate at which the pile warp yarn is dispensed;
whereby pile warp yarn is dispensed by said negative let-off motor to produce a desired pile-to-ground warp ratio.

1 more element

Dependencies are inferred from the claim text.

Electronic control of terry pile warp yarn dispensing rate

Life of this patent

Electronic control of terry pile warp yarn dispensing rate

Life of this patent

Abstract

Claims41