Weaving method with control or adjustment of the yarn tension in warp threads. and weaving machine for producing a fabric using said weaving method

Weaving machine comprising:

• weft insertion means in order, in successive weft insertion cycles, to insert at least one weft thread at a weft insertion level between warp threads,
• shed-forming means for positioning the warp threads in each weft insertion cycle relative to each weft insertion level such that the warp threads and the weft threads inserted in between together form a fabric according to a predefined weaving pattern, and
• a yarn tensioning device for controlling or adjusting the yarn tension of the group of warp threads which comprises at least part of the warp threads,
• wherein the yarn tensioning device comprises several yarn tensioning elements which are provided for changing the yarn tension in the warp threads of respective part groups of the group of warp threads, and a control or steering unit which is provided, in cooperation with the yarn tensioning elements, to adjust or control the yarn tension in the warp threads separately per part group in order to follow a respective reference yarn tension profile during weaving, wherein each part group comprises at least one warp thread;
• that the control or steering unit is provided to change the reference yarn tension profile to be followed during weaving for at least one part group;
• that the yarn tension device comprises a storage unit in which a collection of at least two different reference yarn tension profiles is provided;
• and that the control or steering unit is provided, for at least two part groups, to determine the reference yarn tension profile to be followed during weaving by selection from said collection.