of the motor for controlling the thread brake elements 40 the position of said thread brake elements 40 can easily be determined as a function of the main shaft of the loon furthermore the maximum tension that the weft thread can stand without a real danger of breaking is for example entered into the machine terminal or the central server according to an example of the aforementioned thirteenth aspect of the invention the screen 17 shows for each position of the main shaft the progress bar 43 as well as the thread brake elements 40 in their corresponding positions furthermore on the screen 17 the weft thread is coloured for example blue if its tension is less than 20 of its entered maximum tension green if its tension is between 20 and 50 of this maximum tension orange if its tension is between 50 and 80 of this maximum tension and red if its tension is between 80 and 100 of its maximum tension hereby the colour will become darker red or will flash up the more the measured tension approaches this maximum tension this enables a person to control the tension of the weft thread in particular to control in what positions of the main shaft the tension is the highest and whether the tension approaches the maximum tension of the thread in this way the person can check very easily in which positions of the main shaft and of the thread brake elements there is a considerable risk of a thread break by checking whether the weft thread 47 shown on the screen 17 becomes darker red or.