Abstract: A device for attaching a shaft in a frame includes at least two supports for carrying the ends of the shaft, a support lock which keeps the shaft on its support while permitting the shaft to turn locally, and a hinged locking mechanism for closing and opening the lock. The lock is opened and closed automatically by the hinged locking mechanism, which causes the lock to open against a biasing force in response to insertion of the shaft.

Abstract: A device for supplying weft threads in airjet weaving machines includes at least one nozzle connected to a compressed air source, a buffer tank, a cutoff valve placed in a funnel between the compressed air source and the nozzle, and a controlled throttling device. The throttling device is mounted downstream from the buffer tank and in the immediate surroundings of the cutoff valve, and includes the funnel, a rotary throttling element, and a motor for rotating the throttling element. The funnel is divided into an inlet funnel and an outlet funnel connected to the inlet funnel. The rotary throttling element fits within the inlet funnel and rotates to selectively block an entry to the outlet funnel according to the degree of rotation of the throttling device.

Abstract: A mechanism for mounting a part on the sley of a weaving machine includes a holder in which a relay nozzle of the weaving machine is mounted, a groove extending over the length of the sley, a clamp to be mounted in the groove and having on opposite sides two mutually inclined gripping faces; and screws which fit through openings in the holder and which act on the clamp to cause the clamp to draw the holder against the sley as the screws are tightened, thereby producing a gripping force in both gripping faces. The holder, when mounted, is clamped on at least one side between a corresponding gripping face of the clamp and a lateral side of the groove.

Abstract: A mechanism for presenting weft threads on rapier weaving machines includes a cam mechanism, cam follower devices, armatures connected to the cam follower devices, and thread presentation arms. The cam mechanism and cam follower devices impart reciprocating movements to the armatures such that, alternately, for each successive weaving cycle, the armature connected to one of the cam follower devices cause the movement of one of the thread presentation arms into a presented position, while the armatures connected to the other cam follower device move back to a rest position a thread presentation arm which has just been presented.

Abstract: Apparatus for adjusting the length of the weft thread to be inserted into the shed of weaving looms that provides an automatic correction of the weft thread length during each weaving cycle of the weaving process by adding to or subtracting a variable amount of weft thread from the accumulated length of weft thread prior to insertion of the thread into the shed.

Abstract: A thread clip including a clamping mechanism (1) consisting of a first jaw (2) and a second jaw (3); a spring mechanism (4) which presses the clamping mechanism jaws (1) together; an electromagnetic device (5) which can open the clamping mechanism against the force of the above-mentioned spring mechanism (4); a cam mechanism (6) which can close the clamping mechanism (1) against the force of the electromagnetic device (5); and a mechanism (7) which on closing of the clamping mechanism (1) by means of the cam mechanism (6) presses the different elements of the clamping mechanism (1) against each other with a certain clamping force.

Abstract: A method for regulating the supply of weft thread on weaving machines includes the steps of winding the weft thread from a thread supply by means of a draw-off roller driven by a motor, supplying the thread to an accumulator, and controlling the draw-off roller motor by a pulse train generated on the basis of a set value and a second pulse train whose frequency is proportional to the main shaft of the weaving machine. By adjusting the set value, the speed of the draw-off roller can be adjusted to account for such factors as thread type, thickness extensibility and diameter, and also thread supply package diameter and variations in thread draw-off speed. A device for implementing the method of the invention includes, in a preferred embodiment, a cam, a set value setting unit, a shaft pulse generator for generating the second pulse train, a buffer, and a counter which adds the set value and the second pulse train to generate the first pulse train.

Abstract: Method and apparatus for adjusting the length of the weft thread to be inserted into the shed of weaving looms that provides an automatic correction of the weft thread length during each weaving cycle of the weaving process by adding to or substracting a variable amount of weft thread from the accumulated length of weft thread prior to insertion of the thread into the shed.

Abstract: A drive system for weaving machines includes normally coupled main and auxiliary drive shafts for at least the batten and heddles of the weaving machine, respectively, with the shafts driven by main and auxiliary drive motors at different speeds through appropriate speed reducers and couplings. The shafts are coupled together at one point by an adjustable coupling that is controllable remotely so as to permit fine adjustment between the relative angular positions of the main and auxiliary drive shafts and therefore between the batten and heddle positions. This system has particular application during weaving machine start-up after a weaving interruption; e.g., when a thread break occurs. Various embodiments are described.

Abstract: Device for forming a selvedge or selvedges on woven cloth, consisting essentially of two arms (1, 2) whose ends move to-and-fro in opposite directions, where the first arm (1) has at its end (3) a rotatable thread guide block (5) for the crossing thread or threads, and where the second arm (2) has at least one needle-shaped thread guide (6, 6A, 6B) for the needle thread or threads (27, 27A, 27B) so that the needle thread or threads can be moved up and down in front of the rotatable thread guide block (5) as a result of the motion of the arms (1, 2).

Abstract: A weft thread is inserted in a fluid jet loom by accelerating the weft thread to its insertion speed before the thread reaches the outlet of the main blower nozzle. The thread is accelerated to its insertion speed, for example, by an auxiliary nozzle upstream of the main blowing nozzle of the loom. Multiple weft threads may be inserted in a fluid jet loom by feeding each weft thread from a different supply source to individual weft thread supply channels and thereafter placing selected supply channels in communication with a through channel in a movable conduit block that selectively establishes communication between a single weft thread supply channel and the main blower nozzle. The conduit block can be mounted for various different movements to effect weft thread communication with the main blower.

Abstract: A weft accumulating method and assembly of a weaving loom for accumulating a lenght of weft thread to be inserted into a shed by a pick insertion assembly of the loom in which the accumulator comprises a weft supply; includes a drawing off device off a predetermined length of weft thread from the supply; at least one perforated cylindrical tube; a fluid blowing device to blow the drawn off weft through the tube; and a clamping device to open and close the end of the tube to accumulate weft thread in the tube when the device is closed and to supply the weft thread to the pick insertion assembly when the device is open.

Abstract: A device for the insertion of weft thread into a shed of air insertion looms primarily consists of the combination of a main nozzle, and of at least one auxiliary nozzle fixedly mounted before the main nozzle, the latter having an adjustable flow-through aperture for regulating the jet insertion medium. Associated with each auxiliary nozzle, a control means is utilized for the adjustment of the flow-through aperture. Various embodiments of aperture control are described.

Abstract: An auxiliary nozzle for an air jet loom is configured as straight tubule closed and tapered blade-like at its free end and moveable with the loom batten into and out of the formed sheds. At least one blow aperture near the closed end of the tubule is provided in the shape of a slot extending essentially transverse to the tubule axis. The slot has a width not exceeding 0.8 mm and lateral walls configured so that the least or critical cross-section is bounded at least on one side by an edge having a thickness not exceeding 0.2 mm. If one edge is provided, it is located on the lower side of the slot toward the air supply and away from the closed end of the tubule. Various aperture configurations are disclosed.

Abstract: Process for unwinding a thread from a reel in looms, wherein the thread (6) is guided through a thread guide (4) placed behind the reel, characterized thereby that the distance (L) between said thread guide (4) and said reel (3) is adjusted automatically mainly during the weaving process.

Abstract: A fabric take-up system for a weaving loom includes a driven take-up roll and a pressure roll forming a nip with the take-up roll, wherein the take-up roll at least is movable transversely of its axis so that tensioned fabric received from the loom breast beam, wrapped around the take-up roll, through the nip and around the pressure roll urges the take-up roll towards the pressure roll. Devices for releasing the rolls to open the nip are described, including a support system for preventing deflection of the pressure roll over its length.

Abstract: A method for the control of auxiliary nozzles or blowers for the insertion of a weft thread in air jet weaving looms wherein several auxiliary blowers and/or groups of auxiliary blowers (1-9; 45; 46; 47; 50) are distributed along the shed (10) of the weaving loom comprising controlling a first row of auxiliary blowers and/or groups of auxiliary blowers (1-6; 45; 47) in such a way that these auxiliary blowers and/or groups of auxiliary blowers (1-6; 45; 47) create a basic air stream which achieves the guiding of the weft thread along the shed (10) and the control of a second row of auxiliary blowers and/or groups of auxiliary blowers (7-9; 46; 50) in such a way that these auxiliary blowers and/or groups of auxiliary blowers 7-9; 46; 50) create an additional air stream which mainly creates a pulling force of the weft threads along the shed.

Abstract: Device for supplying a weft thread to a main blower for weaving looms, whereby it is mainly composed of the combination of 2 or several supply channels (1, 2) for weft threads (3, 4); one main blower (5) for introducing the weft threads (3, 4) into the gap; one adjustable wiring block (6) comprising one or several through channels (7;16,17;20,21,22) and which is (are) mounted between, on the one hand, the ends (9,10) of the supply channels (1,2) and, on the other hand, the inlet (11) of the main blower (5), whereby the through channels (7; 16, 17; 20, 21, 22) can be brought into connection by moving the wiring block (6) between respectively one of the supply channels (1, 2, 28) and the inlet (11), of the main blower (5); and means for moving the wiring block (6).

Abstract: A method to control the speed of the weft feed spool in weaving looms includes feeding at least two items of detected data related to weft delivery and supply, and loom operation, into a control mechanism, and using the data to calculate as a number of windings, the variation of the weft length reserve from the average minimum desired weft length reserve as determined by an average weft length reserve sensor and adjusting the speed of the feed spool in response to such calculations. A maximum weft length detector may be used as a control for the feed spool as well as a sensor for the time and number of unwindings of weft from the feed spool.

Abstract: Weft gripper drive for looms of the type consisting of a flexible perforated tape at one end of which a gripper is fixed and of an oscillating gear-wheel that enmeshes with the tape along part of its circumference, whereby guiding devices are provided where the tape leaves the wheel, characterized thereby that the tooth height of the wheel is smaller than the thickness of the tape and that the form and dimensions of the teeth and of the perforations barely allow a mutual enmeshment, whereby the side of the tape directed towards the wheel, in the enmeshment zone, is tangent to the root circle of the gearing of the wheel.