Abstract: In a heavy closed-shed dobby of a weaving machine having oscillating levers which are selectively connected to one of two oppositely movable actuation knives by rocking double hooks mounted thereto so as to control the movement of heddle frames to which the levers are connected, a pair of locking members pivotally mounted to each lever. An elastic element is provided to urge one end of each locking member toward abutting engagement with a double hook thereby preventing pivotable movement of the double hook when engaged by one of the knives. The locking members are released from engagement with the double hook upon simultaneous engagement of the knives with a lever.

Abstract: A mechanism for controlling the reciprocating movement of knives associated with rocking hooks connected to the heddle frames of a weaving machine which mechanism includes a pair of rotatable drums oriented parallel to the path of movement of the knives. Each drum includes two profiled grooves in the surface thereof in which tracking members associated with the knives are cooperatively guided.

Abstract: A dobby for a weaving loom including a series of actuation elements which depend on a weaving program incorporated in a reading device and which are coupled to traction levers connected by a drawing system to the heddle frames, wherein, between the traction levers and the drawing systems of at least certain of the actuation elements there is interposed an arm associated with additional actuation elements which impart thereto a periodic oscillating movement which is in synchronism with the operating cycle of the conventional actuating elements. The arms are pivotally carried by the traction levers so as to continue their oscillating movement to one or the other of two work positions of the lever.