Abstract: A weft detection sensor is provided that detects a passage of a weft to determine a passage timing of a weft circulating around a storage drum, and a weft insertion method includes setting in advance a reference value of a set position arrival timing in association with a set arrival position, regarding the set arrival position and the set position arrival timing at which a leading edge of the weft reaches the set arrival position, and determining an actual value of the set position arrival timing from the passage timing determined in weft insertion during weaving, comparing the actual value with the reference value, and in a case where a deviation occurs between the actual value and the reference value, determining a correction amount of a set value of a weft insertion related device based on the deviation so that the deviation decreases.

Abstract: A multicolor water-jet loom has a first nozzle and a second nozzle, a water supply unit for supplying water to the first and second nozzles, length-measuring devices for storing wefts, locking pins for locking the wefts stored in the length-measuring devices, and grippers for gripping the wefts drawn out from the length-measuring devices. The water supply unit executes an operation to supply one of the first and second nozzles that has been paused for at least a predetermined period with preparatory water only for a preparatory water supply period, the preparatory water supply period including a point one pick before weft insertion is executed by the nozzle that has been paused for at least the predetermined period, in a state where the wefts are locked by the locking pins and gripped by the grippers.

Abstract: Air-jet weaving machine with an apparatus for the supply of compressed air with several pneumatically adjustable pressure regulators (1.1, 1.2, 1.3), wherein the pneumatically adjustable pressure regulators (1.1, 1.2, 1.3) respectively comprise a pneumatic control inlet (3.1, 3.2, 3.3). Furthermore an electrically controllable pressure adjusting means (4) and a control pressure line (5) is present, in which various different air pressure values are producible by the electrically controllable pressure adjusting means (4). To each pneumatic control inlet (3.1, 3.2, 3.3), an electrically switchable valve (6.1, 6.2, 6.3) is allocated, by which the pneumatic control inlet (3.1, 3.2, 3.3) is connectable with the control pressure line (5).

Abstract: Method for introducing a weft thread in a weaving machine which comprises a device (10) for introducing a weft thread (3, 64), which method comprises adjusting a control parameter and adapting the number of insertions for determining the mean deviation of an insertion parameter. Weaving machine which comprises a device (10) for employing an abovementioned method.

Abstract: In some embodiments, a method includes providing a first controller; providing a second controller; using the second controller to control a plurality of valves to provide a sequence of air jets that propel a weft thread across at least a portion of a weft insertion region of an air jet loom; and using the first controller to control at least one aspect of the air jet loom not controlled by the second controller. In some embodiments, a method for a controller in an air jet loom includes (a) defining a reference loom configuration; (b) determining a characterization of the reference loom configuration; (c) determining a modified loom configuration by at least one change to the reference loom configuration; (d) determining a characterization of the modified loom configuration; and (e) revising the reference loom configuration if the characterization of the modified loom configuration satisfies a criteria.

Abstract: A method for insertion of a weft thread (2, 3, 4) on a weaving loom whereby insertion parameter is determined and in which on the one hand at least one control parameter for an insertion is adapted or, on the other hand, at least one control parameter for a weaving cycle is adapted. A weaving loom with control devices (41,42) and a selection device (43) for the application of a method as stated above.

Abstract: A method and a clamping device for clamping a weft thread in a jet weaving machine are proposed. The weft thread strand runs through the beginning section (2.1) and the end section (2.2) of a mixing tube. The two sections between themselves form an engagement opening (8) and are connected with a first holding magnet (11) by a counter support (9). An actuator (6) in the form of an elastomeric bellows, which comprises a chamber (10), is located on the beginning section (2.1) of the mixing tube. The chamber (10) is connected to a valve (16) via a supply line (20) and is acted on variably with compressed air. By deformation of the actuator (6), a clamping element (7) connected thereto carries out a tilting movement between the counter support (9) and a contact stop part (19), which contains a second holding magnet (12). The holding magnets (11, 12) lead to an exact and reliable clamping of the weft thread (3).

Abstract: An apparatus (1) for the insertion of weft threads in a weaving machine is presented. The apparatus includes a nozzle holder (9) and, secured thereto, at least one nozzle (3) with a mixing tube (6) for the insertion of a weft thread (2) as well as a clamping device (7) which can be charged with a medium in order to firmly clamp a weft thread which is introduced into the nozzle. In addition the apparatus (1) contains at least one control valve (8) which is arranged at or in the nozzle holder (9) or nozzle (3) in order to control the clamping device (7).

Abstract: A device for inserting of weft threads in an air jet weaving machine comprising at least one set of main nozzles (13, 14) which are mounted in series, and to which individual regulating valves (21, 22) are assigned, is provided with a control and regulating unit (17) which defines the individual settings of the regulating valves (21, 22) with respect to one another, in order to form an overall value for the intensity of the impulse transmission of the set of main nozzles with each regulating valve contributing a proportion of the overall impulse intensity.

Abstract: A method for transporting the weft thread through the shed of an air-jet weaving machine having a nozzle fed with a flowing transportation medium, wherein the portion, changeable along the weft thread, of the natural thread charges arranged irregularly on the weft thread is contactlessly registered by means of an electrode array, wherein the changing total charge is determined on the electrode array, wherein the periodic change in the total charge is evaluated for determining the axial velocity of the weft thread, and wherein the nozzle of the weaving machine is controlled as a function of the axial velocity of the weft.

Abstract: In some embodiments, a method includes providing a first controller; providing a second controller; using the second controller to control a plurality of valves to provide a sequence of air jets that propel a weft thread across at least a portion of a weft insertion region of an air jet loom; and using the first controller to control at least one aspect of the air jet loom not controlled by the second controller. In some embodiments, a method for a controller in an air jet loom includes (a) defining a reference loom configuration; (b) determining a characterization of the reference loom configuration; (c) determining a modified loom configuration by at least one change to the reference loom configuration; (d) determining a characterization of the modified loom configuration; and (e) revising the reference loom configuration if the characterization of the modified loom configuration satisfies a criteria.

Abstract: A thread clamping device is provided for a jet weaving machine that has a main discharge nozzle (1) with a mixing tube (2) for inserting a weft thread (3) into a shed with a conveying fluid discharged from the main discharge nozzle. This clamping device is placed inside the mixing tube (2) in the area from which the weft thread exits, and has an actuator, which is situated outside of the mixing tube (2), and a lever connected to the actuator so that this lever is actuated by the actuator (6) to execute a tilting or pivoting motion whereby the weft thread is clamped between the lever and an abutment (9) in an opening of the mixing tube.

Abstract: A method for transporting the weft thread through the shed of an air-jet weaving machine having a nozzle fed with a flowing transportation medium, wherein the portion, changeable along the weft thread, of the natural thread charges arranged irregularly on the weft thread is contactlessly registered by means of an electrode array, wherein the changing total charge is determined on the electrode array, wherein the periodic change in the total charge is evaluated for determining the axial velocity of the weft thread, and wherein the nozzle of the weaving machine is controlled as a function of the axial velocity of the weft.

Abstract: A method for the pressure regulation in a weaving machine (1) is presented, in particular in an air jet weaving machine having a pressure regulating system (10) and a weft insertion system for the insertion of a plurality of different weft threads (2, 2?). In the weft insertion system a thread store (2a, 2b, 2a?, 2b?) and a main nozzle (3, 3?) is provided for each different weft thread, with the main nozzle drawing off the respective weft thread from the thread store and accelerating it during the insertion. In addition, there is provided in the pressure regulating system, for a group of main nozzles together, a pressure regulator (20) with a pressure sensor (21), a multi-way valve (22) and a regulator (23) arranged separate from it, with the regulator being connected to the pressure sensor and to the multi-way valve, and the pressure regulator (20) is coupled for the insertion of a weft thread to the main nozzle (3, 3?) of the group corresponding to it.

Abstract: A device for inserting of weft threads in an air jet weaving machine comprising at least one set of main nozzles (13, 14) which are mounted in series, to which each time a regulating valve (21, 22) is assigned, is provided with a control and regulating unit (17) which defines the settings of the regulating valves (21, 22) of a set of main nozzles (13, 14) with respect to one another, in order to form an overall value for the intensity of the impulse transmission of the set of main nozzles.

Abstract: An apparatus (1) for the insertion of weft threads in a weaving machine is presented. The apparatus includes a nozzle holder (9) and, secured thereto, at least one nozzle (3) with a mixing tube (6) for the insertion of a weft thread (2) as well as a clamping device (7) which can be charged with a medium in order to firmly clamp a weft thread which is introduced into the nozzle. In addition the apparatus (1) contains at least one control valve (8) which is arranged at or in the nozzle holder (9) or nozzle (3) in order to control the clamping device (7).

Abstract: A valve (13a) is described comprising: a housing (50) having a fluid inlet for (54) receiving a flow of compressed fluid and a fluid outlet (55); a flow duct (60) movably mounted with respect to the housing, the duct (62) having a fluid inlet (62) for receiving a flow of compressed fluid and a fluid outlet (65), the fluid outlet being positioned around at least a part of the circumference of the duct and being dimensioned to provide a different flow rate at different sections or positions around the circumference of the duct; the fluid outlet of the housing being alignable with a portion of the fluid outlet of the duct to provide a flow rate related to the relative position of the portion of the fluid outlet of the duct and the fluid outlet of the housing; and, a drive element (70) for moving, e.g. rotating, the duct with respect to the housing such that a desired portion of the fluid outlet of the duct aligns with the fluid outlet of the housing. The valve may operate as a so-called throttle valve.

Abstract: Blowing nozzle for supporting a weft thread in a weaving machine, provided with a flow-through canalisation (17) for a fluid tracing a bend (20) near the free end of the blowing nozzle (3) to subsequently flow into the environment via at least one outlet opening (18), wherein a jet pipe (21) is formed in this flow-through canalisation (17), and the jet pipe (21) is integrated in the bend (20).

Abstract: A system for inserting a weft thread into a shed of an air jet weaving machine includes a thread store with a measuring apparatus, a plurality of air nozzles for the insertion of the weft thread and a control system which is connected to the measuring apparatus in order to be able to control the compressed air supply of the air nozzles in dependence on measurement values of the measuring apparatus. Switch-on points are associated with the air nozzles, with the control system charging one or more of the air nozzles with compressed air as soon as a predictor value for the position of the weft thread tip, which is formed with the help of the measurement values, reaches the switch-on point of the relevant air nozzle or air nozzles respectively.

Abstract: A method for controlling weft insertion in an air jet type loom, includes setting an upper limit and a lower limit with respect to the running property of a weft yarn to be inserted through a shed of warp yarns by way of a main nozzle and a plurality of groups of sub nozzles arrayed in the running direction of the weft yarn, and causing air jet end timings of the respective groups of sub nozzles to become later when the running property of a weft yarn is lower than the lower limit, and air jet start timings of the respective groups of sub nozzles to become sooner when the running property of a weft yarn is higher than the upper limit. This method enables stable weaving of high-quality fabric while minimizing air consumption by properly regulating both the air jet start timing and the air jet end timing of sub nozzles of the air jet type loom, considering variation in the running property of a weft yarn.

Abstract: A weft end recovery apparatus comprises weft end carrier for carrying by water flow weft ends formed as a result of weft insertion, a plurality of storing and dewatering sections to receive the weft ends carried from the weft end carrier together with the water, and switching mechanism for selectively switching the storing and dewatering sections to store the weft ends and the water from the weft end carrier.

Abstract: A system for inserting a weft thread into a shed of an air jet weaving machine (1) includes a thread store (21) with a measuring apparatus (23.1, 23.2), a plurality of air nozzles (3, 4, 5.1a-c to 5.na-c) for the insertion of the weft thread (2) and a control system (10) which is connected to the measuring apparatus (23.1, 23.2) in order to be able to control the compressed air supply of the air nozzles (3, 4, 5.1a-c to 5.na-c) in dependence on measurement values of the measuring apparatus (23.1, 23.2). Switch on points (xj) are associated with the air nozzles (3, 4, 5.1a-c to 5.na-c), with the control system (10) charging one or more of the air nozzles (3, 4, 5.1a-c to 5.na-c) with compressed air as soon as a predictor value (xF) for the position of the weft thread tip, which is formed with the help of the measurement values, reaches the switch on point (xj) of the relevant air nozzle or air nozzles respectively.

Abstract: The invention relates to an air jet weaving machine 1 with compressed air supply components for supplying air nozzles 3, 4, 5 and 6 with compressed air. The compressed air supply components comprise a compressed air infeed line with a main shut-off valve and an air filter as well as solenoid values and pressure regulators for controlling and regulating the compressed air which is supplied to the air nozzles, with some of the compressed air supply components being collected in a separate compressed air supply unit 10 which is arranged to be separate from the rest of the weaving machine.

Abstract: An arrangement for supplying air with a controlled pressure to the main weft insertion nozzles of an air jet loom includes a single servovalve connected between a pressurized air source, an air vent, and a pressure manifold, and individual shut-off valves respectively interposed in branch lines connected from the pressure manifold to the individual nozzles. A pressure sensor measures the actual pressure provided to the manifold. An electronic controller receives a pressure control signal and controls the servovalve responsive to any difference between the pressure control signal and the actual measured pressure signal. The arrangement is simple, economical, and rapidly reacting, to avoid the need of individual throttle valves or pressure regulators for the individual nozzles.

Abstract: After a picking action of a weaving machine, a cloth-end warp maintains its shed over a plurality of weaving cycles including a weaving cycle in which weft ends are tucked in. Air is jetted toward a shed formed by warps in a widthwise direction of weaving from outside the cloth after the weaving cycle in which the weft ends are tucked in, and at latest before the cloth-end warp unsheds. The air jet energizes the weft ends, tucked in, inside the cloth in the widthwise direction of weaving.

Abstract: An arrangement for supplying air with a controlled pressure to the main weft insertion nozzles of an air jet loom includes a single servovalve connected between a pressurized air source, an air vent, and a pressure manifold, and individual shut-off valves respectively interposed in branch lines connected from the pressure manifold to the individual nozzles. A pressure sensor measures the actual pressure provided to the manifold. An electronic controller receives a pressure control signal and controls the servovalve responsive to any difference between the pressure control signal and the actual measured pressure signal. The arrangement is simple, economical, and rapidly reacting, to avoid the need of individual throttle valves or pressure regulators for the individual nozzles.

Abstract: A method for monitoring the cycle of the weft insertion into a weaving machine. The weft yarn passes a yarn brake and a yarn force sensor and the force acting on the weft yarn is measured in a known fashion and the reaction force of the yarn is converted by a pressure sensitive element into an electrical signal. The electrical signal outputted by the yarn force sensor is electronically amplified in an evaluation unit, is evaluated and is transmitted to an indicator informing the operator of the development of the weft insertion and of disturbances and corrections. For this purpose, the evaluation unit is connected via a data line with a machine control unit. Evaluation unit is supplied with time signals from the machine control unit associated with further machine functions participating at the weft insertion, e.g. the momentary angular position of the main shaft of the machine. The machine control unit receives monitoring signals of the yarn force evaluation via the data line, e.g.

Abstract: A weft inserting control device for a fluid jet type loom for detecting dispersion of a weft reaching angle to control the reaching angle of weft yarn. The device includes a weft insertion detecting unit for detecting dispersion of the weft reaching angle in a plurality of control cycles such as a plurality of picking numbers, for example. The device also includes a controlling unit for comparing a plurality of detection values of the weft reaching angle given by the weft insertion detecting unit with a plurality of respective different reference values, and for controlling the weft reaching angle on the basis of a result of the comparison in every control cycle.

Abstract: A weft inserting control device for fluid jet type loom is provided, including a weft insertion detecting unit for detecting dispersion of the weft reaching angle in a predetermined control cycle; a first comparing unit for comparing a detection value of the weft reaching angle given by the weft insertion detecting unit with a reference value showing an allowable range of the dispersion; and a second comparing unit for comparing the detection value with a threshold value showing a threshold in controlling the dispersion. The weft inserting control device also includes a controlling unit for controlling the weft reaching angle on the basis of the detection value and a result of the comparison carried out by the first comparing unit. The controlling unit controls the weft reaching angle by reducing a predetermined amount of the detection value and by using the threshold value as the detection value, for example, when the second comparing unit reveals the detection value to be over the threshold value.

Abstract: A valve arrangement of a loom includes valve modules held between flange plates and sharing a common inlet feeding into a common inner valve space. A valve outlet of each valve module leads to an insertion nozzle or nozzle group, and is controlled by a valve disk actuated by a piezoelectric actuator to rapidly dynamically adjust the pressure profile. A quality parameter, characteristic of the thread insertion flight time of each weft thread, is stored in a data bank and has a nominal pressure profile for achieving a nominal thread flight time allocated thereto. The actual thread flight time of each weft thread is measured and compared with the stored nominal thread flight time. A control signal responsive to the time difference is provided to the valve arrangement to control the piezoelectric actuator so as to adjust the pressure and/or the quantity of the pressure medium provided through the valve module to the connected insertion nozzle.

Abstract: In a selvedge forming device, the operating condition for operating at least one of the selvedge forming elements contributing to the selvedge formation is set in advance in correspondence to a weaving condition, and the selvedge forming device is operated in accordance with the weaving condition and the operating condition as set in advance, while the weaving process goes on.