Patent DE-10059967-A1 (DE)
Title: The assembly to monitor the yarn splicer, as a robot maintenance unit moved to the open-end spinning station, has a signal transfer between the splicer and the yarn monitors through a communication link with the control
Inventor: ZIPPERER MARTIN
IPC: D01H13/32
Filed: 2000-12-02
Abstract: The assembly to monitor the yarn splicer, as a mobile unit which services a number of open-end spinning stations (1), has a communication unit which links the automatic splicer (2) and the yarn monitor (6), to transfer the splicing parameters from the splicer to the yarn guide.  The assembly to splice yarns at open-end spinning stations has a yarn monitor at each station with an evaluation unit. During the splicing phase, the splicing parameters are used to compute a speed profile and/or a yarn position. The evaluation unit couples the computed values from the splicing parameters with the yarn characteristic values, and the coupled values are stored in memory. The evaluation unit has a comparator, to compare the coupled values with preset threshold values, to generate a yarn cleaning signal if one or more thresholds are breached. The evaluation unit takes the splicing parameters to compute the timed and/or location position of the splicer, or the coupled values for the splicer are stored in memory. The splicing parameters include at least one reference value for the splicing speed and a timing reference value for the splicing start time. The spinning stations and/or the splicer have a number of yarn monitors, for different yarn quality parameters. A synchronizing parameter synchronizes the yarn monitor with the splicing time curve as a running time compensation parameter, which compensates for the communication time of the splicing parameter to the yarn monitors for compensation at the control of the automatic splicer or the yarn monitors. An Independent claim is included for a yarn splicing operation where the automatic splicer transfers the splicing parameters to the yarn monitors, to give the required yarn cutting positions from the measured yarn characteristic values during splicing. Preferred Features: The yarn quality values are computed from the data of the yarn cutting positions and the measured yarn characteristic values. The yarn cutting position for the splicer is computed from the splicing parameters separately for each spinning station, and they are stored in memory. The quality value is used to optimize the splicing action for one or more splicers for each spinning station. The measured yarn characteristic value for the upper yarn in front of the splicer is not taken into account or stored in the computation of the yarn quality. The yarn quality values are compared with one or more given threshold values, to trigger a yarn cleaning action by the splicer if at least one threshold value is breached. The splicing parameters are transferred from the splicer to the yarn monitors at the start of the yarn take-off. The splicing parameter gives a time point where the splicer goes through the monitors and a second time point when the yarn take-off speed achieves a nominal level. For the second time point, it is an additional condition that the splicer must have passed through the yarn monitors. The splicing parameter also gives the yarn take-off speed to the first time point. During splicing, the automatic splicer continuously transfers the actual yarn take-off speed to the yarn monitors as measured by the splicer. The splicer transfers a signal to the yarn monitors when it is through. An absolute synchronization between the splicing cycle and the assignment of the measurement values to the yarn position is made through a compensation parameter.