Starting Method for a Weaving Machine

Abstract

The invention relates to a method for the controlled run-up of a weaving and shedding machine, wherein the weaving and the shedding machine are connected with a controller, wherein the weaving machine is driven by means of a main drive, wherein the shedding machine is driven by means of an electric motor auxiliary drive, wherein the weaving and the shedding machine are connected by means of a common converter intermediate circuit for the energy flow transmission, wherein the shedding machine is started at a time point t0 and is run-up until to a time point t1 to an overspeed that lies above its operating rotational speed, wherein the time point t1 lies before a time point t3, wherein the weaving machine is started at a time point t2 and wherein the start phase of the weaving machine lies in the time interval from the time point t2 to the time point t3, and wherein a power transmission (feedback) by means of the converter intermediate circuit from the shedding machine to the weaving machine is carried out in the stated start phase. The method according to the invention is characterized in that the shedding machine is run-up to a predetermined overspeed between the time points t0 and t1, and that the gradient of the rotational speed progression of the shedding machine is more negative in a later section of the start phase than in an earlier section.

1 . Method for the controlled run-up of a weaving and shedding machine,
 wherein the weaving and the shedding machine are connected with a controller,   wherein the weaving machine is driven by means of a main drive,   wherein the shedding machine is driven by means of an electric motor auxiliary drive,   wherein the weaving and the shedding machine are connected by means of a common converter intermediate circuit for the energy flow transmission,   wherein the shedding machine is started at a time point t 0  and is run-up until a time point t 1  to an overspeed that lies above its operating rotational speed, wherein the time point t 1  lies before a time point t 3 ,   wherein the weaving machine is started at a time point t 2 , and wherein the start phase of the weaving machine lies in the time interval from the time point t 2  to the time point t 3 , and   wherein a power transmission (feedback) by means of the converter intermediate circuit from the shedding machine to the weaving machine is carried out in the stated start phase,   characterized in that the shedding machine is run-up to a predetermined overspeed between the time points t 0  and t 1 , and   that the gradient of the rotational speed progression of the shedding machine is more negative in a later section of the start phase than in an earlier section.   
     
     
         2 . Method according to  claim 1 , characterized in that in the temporal midpoint, the gradient of the rotational speed progression of the shedding machine between the time point t 2  and a time point t′ is less negative than in the temporal midpoint between the time points t′ and t 3 . 
     
     
         3 . Method according to  claim 1 , characterized in that the gradient of the rotational speed progression of the shedding machine toward the end of the start phase is the most negative in the entire time span of the start phase. 
     
     
         4 . Method according to  claim 1 , characterized in that the gradient of the rotational speed progression of the shedding machine is a strictly monotonic declining function as of the later of the two time points t 1  or t 2 . 
     
     
         5 . Method according to  claim 1 , characterized in that the stated overspeed of the shedding machine is calculated by means of a computing unit with the use of machine data. 
     
     
         6 . Method according to  claim 5 , characterized in that for the calculation of the overspeed and of the further rotational speed progression of the shedding machine, additionally process data, at least such data based on calculated or estimated weaving machine losses and advantageously also on shedding machine losses, preferably also based on the duration of the stated start phase of the weaving machine, flow into the stated calculations. 
     
     
         7 . Method according to  claim 1 , characterized in that the rotational speed progression for the weaving machine in the stated start phase is prescribed in such a manner so that at least toward its end it comprises a decreasing, that is to say less positive, gradient.