Roving bobbin creel for a ring spinning machine , comprising at least two creel rows which are formed by longitudinal beams and can be equipped with roving bobbins , the longitudinal beams being supported on vertical creel bars via transverse profiles , the roving bobbin creel being provided with sensor units which detect, by measurement, the amount of roving present in the creel rows and transmit this amount to a computer device which calculates therefrom the remaining operational time for the roving in the roving bobbin creel , characterized in that the sensor units are arranged in the region of the longitudinal beams of the roving bobbin creel , the sensor units are provided with strain gauges which detect the bending load of the associated longitudinal beam , which is dependent on the weight of the roving bobbins , and each longitudinal beam of the roving bobbin creel in the region of each machine section of the ring spinning machine is provided with its own sensor unit , or in that the sensor units are installed in the region of the transverse profiles of the roving bobbin creel , a sensor unit is arranged on the transverse profiles both in front of and behind the fastening of the transverse profiles to the vertical creel bar , and the sensor units detect the bending stresses introduced by the weight of the roving bobbins into the relevant portions of the transverse profiles , or in that the sensor units are each arranged in the region of the vertical creel bars of the roving bobbin creel , have a bearing component fastened in a stationary manner to a creel bar and a measuring part mounted movably with respect to this bearing component , and detect the contact pressure of the transverse profile resting thereon, which is in turn subject to loading by the longitudinal beams which support the weight of the roving bobbins . the roving bobbin creel being provided with sensor units which detect, by measurement, the amount of roving present in the creel rows and transmit this amount to a computer device which calculates therefrom the remaining operational time for the roving in the roving bobbin creel , characterized in that the sensor units are arranged in the region of the longitudinal beams of the roving bobbin creel , the sensor units are provided with strain gauges which detect the bending load of the associated longitudinal beam , which is dependent on the weight of the roving bobbins , and each longitudinal beam of the roving bobbin creel in the region of each machine section of the ring spinning machine is provided with its own sensor unit , or in that the sensor units are installed in the region of the transverse profiles of the roving bobbin creel , a sensor unit is arranged on the transverse profiles both in front of and behind the fastening of the transverse profiles to the vertical creel bar , and the sensor units detect the bending stresses introduced by the weight of the roving bobbins into the relevant portions of the transverse profiles , or in that the sensor units are each arranged in the region of the vertical creel bars of the roving bobbin creel , have a bearing component fastened in a stationary manner to a creel bar and a measuring part mounted movably with respect to this bearing component , and detect the contact pressure of the transverse profile resting thereon, which is in turn subject to loading by the longitudinal beams which support the weight of the roving bobbins . <EOS>