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AssigneeLiba Maschinenfabrik GmbH
InventorRudi Wirth
Estimating the term…
An apparatus for measuring and controlling the amount of yarn withdrawn from the warp beam of a warp knitting machine is disclosed. A pressure roll engages the yarn wound on the warp beam. The pressure roll drives a second drive roll connected to a signal generator for generating signals representative of the speed of yarn withdrawn from the warp beam. The signals preferably are evenly spaced yarn length pulses representing a measure of the length of yarn withdrawn from the warp beam. The pulses are transmitted to a controller circuit which compares the generated pulses with a predetermined knitting machine operating standard and generates a control signal to the warp beam drive mechanism for controlling rotation of the warp beam. The drive roll preferably is manufactured with a wear-resistant surface and the diameter of the drive roll is dimensioned so that the evenly distributed yarn length pulses represent a yarn length corresponding to a fraction of a minimal racking movement of the yarn laying bars in the warp knitting machine.
An apparatus for measuring and controlling an amount of yarn withdrawn from a warp beam of a warp knitting machine having a frame for supporting the warp beam, a drive mechanism for rotating the warp beam during knitting, and comprising a pressure roll, support means pivotally connected to the frame and rotatably supporting the pressure roll for movement into an operative position in which the pressure roll engages the circumferential yarn surface of the warp beam so that the pressure roll rotates as the warp beam rotates and yarn is withdrawn from the warp beam, a drive roll rotatably mounted on the support means and wherein the periphery of the drive roll frictionally engages the periphery of the pressure roll for rotating with the pressure roll as yarn is withdrawn from the warp beam, a signal generator operatively connected to the drive roll for generating signals representative of the speed of yarn withdrawn from the warp beam, a controller operatively connected to said signal generator and said drive mechanism for receiving the generated signals and comparing the generated signals to a predetermined knitting machine operating machine standard for controlling the drive mechanism and varying the rotational speed of the warp beam and resultant yarn withdrawal rate therefrom, and wherein the drive roll diameter is dimensioned so that each rotation of the drive roll corresponds to a predetermined length of yarn withdrawn from the warp beam.
Dependencies are inferred from the claim text.