Abstract: A mechanism for controlling the movement of the griffe frames of shed-forming device in a weaving loom which includes a pair of levers which are pivotally mounted to the loom frame work and to one of the griffe frames in such a manner as to define a shiftable quadrilateral linkage which when reciprocated causes the griffe frame to move obliquely from a lower to a higher position to allow passage of the picks of the loom.