Abstract: The device for detecting breakage of leno threads in leno selvedge devices on looms, the leno selvedge forming device being provided with at least two arms for guiding at least two leno threads, the leno threads being twistable together by virtue of the rotation of the arms, the device (12, 13, 14, 14a) for detecting thread breakage being provided with a facility (13, 14) for determining the natural oscillations of the arms (12) and a loom, more specifically with heald frames, with at least one leno device which is reversible in its direction of rotation and with a facility for detecting breakage of the leno threads, the device for detecting thread breakage being arranged in the front shed (V), more specifically between the leno device (10) and the heald frames (20).

Abstract: Drop pin for stop motion (1) comprising a body (2) with a yarn lead-through opening (3) provided to rest on a thread, extending through this opening (3), by means of a supporting edge (4), forming a concavely curved bordering of this opening (3) and which, in cross-section, has a convex form. The form of the supporting surface (4) may be a rounded spherical form, as well as a form with a number of angle forming sides, such as for instance a polygon. Preferably, the yarn lead-through opening (3) is circular. Also a device for detecting the thread breakage on a weaving machine, comprising a number of similar drop pins for stop motion and a weaving machine provided with a similar device are within the scope of this invention.

Abstract: A device for tensioning and drawing back warp yarns brought from a creel to a weaving machine. The tensioning and drawing back device keeps tension and if necessary draws back warp yarns (2) led from a bobbin (1) to a weaving machine. A supporting body (6) has a curved friction surface to support the warp yarn (2) between the bobbin (1) and the weaving machine. A first (7) and a second tensioning element (8) exert a tensile force on the warp yarn (2), respectively, in front of and behind the curved friction surface (6). The tensioning elements (7), (8) can be suspended from the warp yarn (2) and for example only through their own weight may exert this tensile force. This device easily draws back the warp yarn (2) out of the weaving area. The replacement of a bobbin (1) occurs without interruption or disturbance of the weaving process.

Abstract: An elongated blade (20) has a slot (22) for receiving a contact bar (15) and an eyelet (30) at one end for receiving passing yarn (11). The eyelet (30) has a curled lip (34). The upper end of the slot has a slanted, or oblique, edge (23) which forms an angle with each side of the slot (22). A flange which includes an oblique edge flange (24) and side edge flanges (26, 28), extends around the perimeter slot (22) except at the intersection of the oblique edge (23) and the longer side of the slot. In one preferred embodiment of the drop wire (10), the blade is twisted (32) between the slot (22) and the eyelet (30) to position the eyelet (30) and slot (22) 90.degree. with respect to one another. In another embodiment (12), the blade is flat.

Abstract: For a reliable closing of the electric circuit between the inner and outer part of a contact rail on an electric warp stop, a contact drop wire with a chamfered drop wire head is provided, wherein the inner edge of the drop wire head that faces the contact rail slot of the drop wire has at least two sections which are differently chamfered.

Abstract: An apparatus automatically repairing broken warp threads in weaving machines or looms. The apparatus comprises a computerized control system having a memory storing predetermined characteristics for drawing-in of a harness and reeding each one of a plurality of weaving machines. The control system receives information on a row of drop wires which has brought about a stoppage in one of the weaving machines. A detecting device is controlled by the control system, which detecting device determines a numerical position of the fallen drop wire in a row of drop wires which contains the fallen drop wire, and sends information of this position to the computerized control system. A moving reed space counting device also controlled by the control system moves along the reed of the weaving machine and stops directly opposite the reed space at the location of a broken end corresponding to the fallen drop wire, responsive to information received as to the position of the fallen drop wire by the control system.

Abstract: Each drop plate has an aperture through which a search bar can pass in order to establish an electrical circuit should a warp yarn break. The plates may be of laminated construction with one or more metal layers and one or more layers of a vibration-damping material such as a plastics. The plates may also be made of a plastics coated metal layer. The plastics layer(s) serve to damp vibrations in the plates and thus reduce noise in the operation of the weaving machines.