Rotary dobbies for weaving looms

In a dobby of the rotary type having a dobby element for actuating each heddle frame of a weaving loom, the loom having a main shaft driven with intermittent rotational motion and having a reading device having control members located at element control stations adjacent to the shaft, each heddle frame actuating element comprising:

• a connecting arm operative to actuate a heddle frame, the arm having a central opening loosely surrounding the shaft;
• an eccentric member between the shaft and the connecting arm and having an outer surface on which the connecting arm is journaled at its central opening, and having an inner opening surrounding the shaft and journaled thereon, the inner opening being disposed eccentrically with respect to said outer surface, and the eccentric member having a pivot lug extending radially therefrom and offset laterally from said bead on the arm;
• a driving disc carried by the shaft adjacent to the eccentric member and of diameter larger than the shaft, and the outer periphery of the driving disc having annularly spaced notches thereon;
• and
• a rocking hook pivotally supported by the lug on the eccentric member and having a notch-engaging nose on one side of the pivot disposed opposite the periphery of the disc, the rocking hook when located at a control station of the reading device being disposed to be selectively rocked by a control member to engage its nose into a notch of the periphery of the disc in order to couple the main shaft with the eccentric member.