58 and 62 and which is articulated on an axle 60 reference numerals 58 39 and 58 34 show the maximum amplitude positions for the displacement of leg 58 the leg 62 has articulated thereon a transmission rod 66 e g via a displaceable connection 64 the other end of said transmission rod 66 being articulated on a two leg essentially rectangular second lever 67 which is adapted to be rotated about an axle 72 the leg 70 of said lever 67 has articulated thereon an additional transmission rod 74 which is articulated on the heald frame 76 said heald frame 76 being guided such that it is displaceable in the direction of movement of the leg 70 as is schematically shown by reference numeral 79 a heald 78 is provided in the heald frame 76 so as to effect shedding in the way in which this is normally done in the field of weaving technology as can be seen from fig2 a rotation of the main shaft to the upper maximum amplitude position 52 34 results in a displacement of the first lever to position 58 34 which will result in a corresponding displacement of the second lever 67 and this displacement will in turn be transmitted to the heald frame 76 which is adapted to be displaced in the direction of displacement of the leg 70 and which will then be moved to its lower maximum displacement position 76 34 an orientation of the main shaft in the case of which the crank 52 occupies its lower maximum amplitude position.