Thread tensioner

A thread tensioner, having a tension device (5) which comprises

• a hollow first insert (41) forming a thread inlet having an inner surface (53) shaped as a surface of a truncated cone,
• a hollow second insert (42) forming a thread exit and having a basic body (49) with an inner wall section (47) shaped as a surface of a truncated cone,
• whereby each said truncated cone shaped surface (47, 53) of each said insert (41, 42) are engaged to each other at a base (48, 52) having a first small diameter of each said insert, said thread tensioner further comprising:
• a tension body (10) with a surface shaped as a surface of a cone and located in the basic body (49) of the second insert (42), the cone shaped surface of the tension body (10) engage on the truncated cone shaped surface (47) of the second insert (42) allowing the tension body (10) to be pressed against said cone shaped surface (47) of the second insert (42),
• said tension body and each said insert being placed coaxially to each other in a major axis A,
• a package (2) comprising a supply of the thread (3) to be treated being placed coaxially to the tension device (5) in the major axis A,
• said package (2) being spaced below a base (51) of the first insert (41) having a second large diameter providing an inlet section (301) for the thread (3) to be drawn off overhead from the package (2) and lead into the tension device (5),
• a deflection angle alpha between the main axis A of the package (2) and a passage of a section (302) of the thread (3), which leaves the tension device (5) and is lead to a warp beam to form a warp thereon, said angle alpha being between 70 to 90 degrees or more,
• a deflection of the thread (3) by said angle alpha being effected in two steps,
• the thread (3) being deflected in a first deflection step by an angle beta below the truncated cone shaped surface (47) of the second insert, said angle beta being greater than a deflection angle in a second deflection step on the truncated cone shaped surface (47) of the second insert and
• wherein a greater part of deflection of the thread (3) takes place before the thread (3) is engaged between the tension body (10) and the second insert (42) of the tension device (5).