Abstract:
An apparatus for measuring the torsional rigidity of a fibrous material utilizes a rotating viscous liquid of known viscosity to impart a torque to the fibrous material. The fibrous material is clamped at its upper and lower ends by clamping devices and the lower clamping device is connected to a cylindrical mass which is floated in a viscous liquid of known viscosity contained within an outer container. The outer container is rotationally driven to impart a circular motion to the viscous liquid which accordingly applies a torque to the cylindrical mass. The torque applied to the cylindrical mass effects turning of the fibrous material and the extent of turning is measured to obtain an output proportional to the torsional rigidity of the fibrous material.
Abstract:
The system to control the winding of yarn on to a bobbin uses a tension sensor to give a periodic measurement of the yarn tension to be compared with a pre-set value which is either constant or proportional to the increasing dia. of the bobbin, so that the rotary speed of the bobbin can be controlled throughout the winding operation. The system gives a continuing monitoring action on the yarn without imposing friction which could lead to abrasive damage of the yarn, and without requiring complex mechanical components to register yarn tension.
Abstract:
An apparatus for measuring the torsional rigidity of a fibrous material utilizes a rotating viscous liquid of known viscosity to impart a torque to the fibrous material. The fibrous material is clamped at its upper and lower ends by clamping devices and the lower clamping device is connected to a cylindrical mass which is floated in a viscous liquid of known viscosity contained within an outer container. The outer container is rotationally driven to impart a circular motion to the viscous liquid which accordingly applies a torque to the cylindrical mass. The torque applied to the cylindrical mass effects turning of the fibrous material and the extent of turning is measured to obtain an output proportional to the torsional rigidity of the fibrous material.