bar 16 which form together the u shaped frame part which is nonmovable in elevational direction are anchored pivotally through the pivot bolt 19 in the bearing 20 which permits the operator to spread apart in a conventional manner the upper parts of two adjacent heddle frames if he wants to repair a warp thread therebetween in a special construction the bolt 19 is part of a slider 21 which is guided in a groove 22 an easily accessible regulating screw 23 has a head 24 which engages the vertical guide bar 16 and threadedly engages with its thread 25 the thread of the slider 21 this connection permits an adjustment of the fixed frame part 10 16 in its vertical height relative to the bearing 20 secured to the weaving machine frame 1 or to the floor and relative to the movable upper bar 9 as a result the tension of all springs 13 of one frame can at the same time be easily adjusted which may for example be necessary when the type of warp thread is being changed in addition the screw can be removed completely from the slider 21 the entire frame consisting of the parts 9 10 11 13 and 16 and can be removed from the weaving machine the threading on rail 18 may have weak or strong teeth 26 which makes movement of the springs 13 difficult or impossible one can easily see from the illustrations that a considerable part of the heddle frame 10 16 is not moved either by the dobby or by the springs thus the.