Abstract: A weaving loom for producing at least one woven fabric web (9) with at least one laid-in selvage includes a weft thread cutting device (23) and an associated selvage laying-in device (14). The cutting device and the laying-in device are mounted relative to the loom machine frame so as to be adjustably movable across the width of the loom along a spreader table (11) with its associated spreader devices (10, 12, 26) and then selectively fixed at any desired width-wise position. The cutting device and the associated laying-in device can be arranged to be independently adjustable, or can be mounted on a common support member, so as to be adjustable in common or in unison with each other across the width of the loom.

Abstract: In an air jet loom, a method is provided for avoiding weaving a faulty weft thread such as a broken weft thread into the cloth being woven. When a faulty weft thread is inserted into the loom shed, the failure of the thread to traverse the weaving width is detected preferably optoelectronically by a suitable sensor. Thereupon the weaving operation of the loom is interrupted and a repair thread is inserted into the loom shed to remove the faulty weft thread. The length of the repair thread is less than the normal length of the weft threads that are inserted for the usual weaving operation. Thereby the repair thread is too short by itself to reach the weft thread sensor, and only when the faulty thread is properly connected to the repair thread will the sensor be triggered.

Abstract: Avivage deposits on and between the dents of a reed, especially in an air weaving loom, are removed by heating at least a portion of the reed dents in the vicinity of the weft insertion channel to a temperature sufficient to melt the avivage which can then be discharged from the reed dents and the spaces between the reed dents by dripping downwardly, for example, into a collecting trough.

Abstract: A weft guide channel (6) in a reed of an air jet loom can be lengthened or shortened by telescoping sections forming one or two channel extension members (10, 18) and/or by intermediate inserts (21, 22, 23) that also have a weft guide channel portion (21A, 22A, 23A). The extension member (10) and the inserts are mounted to a mounting bracket (9) which itself is secured to the reed and/or the sley carrying the reed. At least one weft stop motion device is provided for each extension member and/or for the respective insert. One of the extension members is provided with air ducts (14, 15) for a crosswise air flow for stretching a weft thread.

Abstract: Faults in fabrics such as smooth woven fabrics or pile fabrics caused by transition operational conditions are avoided, especially on air nozzle weaving looms. Such transition operational conditions may occur when rated operating parameters must be changed, for example, due to the use of a different type of weft thread or a change in the weaving pattern and/or weave binding. For this purpose, the weft thread insertion is interrupted only during the duration of the so-called transition operational conditions. Weft insertion is interrupted by performing so-called fluidic or non-fluidic empty or mis-shots. Simultaneously, the warp let-off and the fabric take-up is controlled as a function of the number or duration of the empty or mis-shots in such a way that at this point of time during the transition operating conditions the beat-up edge of the fabric is held in a position away from the beat-up position of the reed.

Abstract: An air weaving loom is equipped with a reed in which the weft thread insertion channel has an inlet channel section and an outlet channel section. Both the inlet and outlet sections have enlarged cross-sectional areas to provide space for the operation of a respective hold-down member that keeps the weft thread in position when the ends (8A) of the weft thread (8), after cutting at the inlet end, are blown back into the selvage formation by respective nozzles (20) that cooperate with the respective hold-down member (2).

Abstract: The inclusion of faulty weft threads into a fabric being woven on an air nozzle loom is prevented with a minimal effort and expense for equipment and control components. For this purpose a sensor upstream of the weft thread insertion components provides the signal of a fault and this signal starts a thread removal program under the control of the loom control unit. The program is stored in the memory of the central computer of the control unit. According to the program the beat up motion is stopped and a predetermined length of weft thread is passed entirely through the insertion channel. When a predetermined number of weft shots have been made or a predetermined length of time has passed, the program provides a signal for the cut off of the faulty section of the weft thread and the faulty section is sucked out of the insertion channel and collected in a container.

Abstract: A running out weft thread end is transferred from a now empty bobbin to a full bobbin during the insertion of a weft thread into the shed of an air nozzle weaving loom from several thread supply bobbins is controlled to obtain a uniform weave even when the thread supply changes from an empty bobbin to a full bobbin. The transfer of the thread is detected and the respective signal is used to temporarily interpose on in a normal thread travelling pattern, a transitional travelling pattern to eliminate disadvantageous influences that affect the weft thread insertion during the transfer of the weft thread from one thread supply to the next. The transitional travelling pattern begins during or immediately after the detection of a thread transfer taking place. The transitional travelling pattern is maintained for a time sufficient to pull a starting amount of weft thread off from the thread supply or until the thread transit time has reached a rated value.

Abstract: The insertion of a weft thread into the loom shed through the weft thread insertion channel of an air jet loom is controlled in two phases in order to apply the proper weft thread acceleration to each type of yarn individually so that too slow insertions and too fast insertions can be corrected. Following a first acceleration, the starting point for the second acceleration is either advanced or delayed. When the weft thread arrives too late, the application of the second acceleration at a higher pressure than the first acceleration, is shifted forward to take place earlier. If the weft thread arrives too early, the application of the second acceleration is delayed to again compensate for achieving a proper arrival time of the weft thread at the exit end of the insertion channel. If the rated insertion time duration coincides with the actually measured insertion time duration, a correction is not needed.

Abstract: A guide mechanism for presenting a weft thread to a cutter, especially in an air jet loom, has a weft thread guide pin which is driven up and down in synchronism with the beat-up motion of a loom slay, so that a beat-up weft thread is stretched by the guide pin either due to the return motion of the slay or by a horizontal motion component imparted to the guide pin in addition to its vertical movement. During the forward stroke of the beat-up motion of the slay the guide pin is out of the way of the weft thread. The cutting takes place when the weft thread is stretched across the cutter. The return motion of the slay and a forward motion of the guide pin can be combined for applying the proper tension to the weft thread to be cut.

Abstract: A weft thread monitor for an air weaving loom with air jets for inserting weft thread yarns of different qualities such as coarse, fine, thick or thin yarns into the loom shed, has an amplifier or comparator controlled in response to control signals which represent the different yarn qualities for providing a loom control signal which is substantially independent of these yarn qualities. The different quality yarns are pulled off from thread storage spools. The air jets of the main nozzles and of relay nozzles are controlled by an air jet insertion control forming part of a central processing unit. The weft thread monitor with its monitoring or sensor element or elements is arranged at the exit side of the air channel formed by profiled reed teeth of the air jet loom. The output of the sensor element is connected to the input of the amplifier or comparator.

Abstract: A nozzle control device for an air weaving loom has a weft thread insertion by one or more main nozzles and a feed advance of the yarn in the air insertion channel by relay nozzles arranged one behind the other at the weaving reed. The relay nozzles are controlled in groups and in sequence in an impulse type manner in such a way that the thread tip zone is seized by the air stream and the thread is pulled through the air insertion channel. The control of the relay nozzles of an air weaving machine is accomplished in such a way that in sequential work steps substantially different types of yarns can be woven with a high quality. For this purpose the durations of air impulses supplied to the relay nozzles arranged in groups, are controlled as a function of yarn specific values modified by a currently measured air effectiveness of the respective yarn being processed.

Abstract: An air jet weaving loom with a jacquard frame wherein harness threads are fed to a reed having a defined drawing-in width. Weft thread insertion devices are arranged on the weft insertion side. A catch side or weft exit side having an adjustable length, is provided with catching elements. The weft thread insertion devices have been arranged on the insertion side of the loom to be movable in the direction of the weft thread insertion for producing woven fabrics with different drawing-in widths.

Abstract: The weft thread or weft threads in an air nozzle loom are plied into multi-strand weft threads directly in the loom. For this purpose one or several plying devices are arranged directly in the loom between a plurality of weft thread strand supply spools or cross-wound bobbins and the multi-ply weft thread insertion nozzle.

Abstract: A pneumatic loom having at least two blow nozzles arranged in a bundle, is equipped with a weft thread insertion alignment device (2) located in a fixed position between the blow nozzles and the weft thread guide channel formed by the reed teeth. The alignment device (2) has an alignment slot having a funnel-shape receiving the weft threads at a wide inlet opening and leading the weft threads to a narrower outlet opening. The alignment slot extends along at least a portion of the path followed by the reed teeth on their beat-up motion. One end of the alignment slot is open toward the weft thread cutting scissors for exit of the weft threads. Weft threads waste is kept very low by the location of all relevant components close to each other. The effectiveness of the scissors is not impaired at all. The time available for the weft thread insertion is increased which means that the r.p.m. of the loom can be increased.

Abstract: The air distributor and control unit contains a stator with an outlet port and a rotor which is rotatably mounted within the stator with an opening to permit a flow of air to the outlet port. A control element is provided between the rotor and stator to control the supply of medium from a pressure chamber to the outlet port. The control element may be in the form of interfitting shell type members which can be adjusted to change the beginning, end and/or duration of blowing for a given nozzle.