behavior can be explained by observing that in the case of conventional symmetric heald frames the strains in both heald slide bars are generally directed in different senses as well as being of different intensity but in the case of the asymmetrical heald frame according to the invention both heald slide bars deflect in the same sense even if to a slightly different extent one in respect of the other in this way the frame behaves dynamically keeping substantially unvaried distances between corresponding points of the two heald slide bars no or practically no relative flexure the breaking of the frame stitches which easily occurs in the case of conventional frames unless their structure is strengthened is thus prevented in the frame according to the invention without having to resort to the disadvantageous devices of known technique with evident considerable progress it should be noted that the proposed solution as well as being extremely economic in that it uses interchangeable parts which are already widely used in this field of technique also keeps the weight and inertia low in that it strengthens the structure of only one of the heald slide bars of the frame and above all it does not introduce any kind of supplementary bulk it has also been found that the heald frame according to the invention behaves particularly well at the high speeds even in the case of working with unbalanced weaves as.