Method and apparatus for measuring the tension of the warp in a weaving machine
AssigneeSulzer Rueti AG
InventorsGodert De Jager, Dietmar Markward, Lorant Gacsay
Life of this patent
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Abstract
In the method a force F.sub.M is measured which has substantially the same magnitude over the pivotal range depending on the path of the warp and on the geometrical arrangement of the deflection member, of the tensioning member and of the pivot axis. The tension of the warp can thereby be substantially correctly determined independently of the position of the tensioning member by measurement of the force F.sub.M, and the measured value can be directly incorporated into the regulation of the warp let-off.
Claims14
Method for the measurement of tension in a warp of a weaving machine, wherein the warp is led along a path over a deflection member and a rotationally symmetrical tensioning member which is pivotable over a pivotal range, is acted on by a spring, and is pivoted about an axis under the action of the warp, wherein a force acting on the tensioning member is measured by a force pickup connected in a force transmitting manner to the tensioning member, and measuring a force F.sub.M which has a substantially constant magnitude over the pivotal range in dependence on the path of the warp and on a geometrical arrangement of the deflection member, the tensioning member and the pivot axis.
Apparatus for the measurement of tension in a warp of a weaving machine, comprising a deflection member over which the warp is led along a path and a rotationally symmetrical tensioning member which is pivoted about an axis, a force pickup device which has a pressure pickup surface that is elastic in bending and includes at least one measurement element which is connected to the pressure pickup surface, the force pickup device and the tensioning member being arranged with respect to one another so that a normal line at a center of the pressure pickup surface and a line along which a force F.sub.M acts and which is to be measured by the measuring element extend in substantially the same direction.
A method for measuring tension in a warp of a weaving machine, the warp being formed by a multiplicity of warp yarns, comprising the steps of providing a deflection member and a rotationally symmetrical tensioning member which is pivotable about a pivot axis;
- biasing the tensioning member about its pivot axis in a first direction;
- leading the multiplicity of warp yarns over the deflection member and the tensioning member to thereby subject the tensioning member to a force which pivots the tensioning member in a second direction opposite to the first direction about the pivot axis and over a pivotal movement range;
- geometrically positioning the deflection member, the tensioning member and the pivot axis relative to each other so that the application of the force generates a component force F.sub.M which is substantially constant over the pivotal movement range of the tensioning member;
- and measuring the component force F.sub.M with a force pickup device operatively coupled to the tensioning member.
Dependencies are inferred from the claim text.