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 (6, 14) 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 (6, 14) 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.