Abstract: A method for supplying weft threads to the weft of a weaving machine includes the steps of leading the thread successively through two thread accumulators, one of which is a prewinder which at each insertion releases a length of thread equal to the thread length required, and the second of which is a thread accumulator which has a lower draw-off resistance than the prewinder, and which provides a thread accumulation consisting of at least a part of the length of thread released from the prewinder. An apparatus for implementing the above method includes the above-mentioned two accumulators and control means for controlling thread insertion nozzles and also a thread clip on the low-resistance accumulator which determines the beginning of insertion and a magnetic pin on the prewinder which controls the end of insertion.

Abstract: Formable twistless woven precursor fabrics, especially in satin or basket weave, made from warp and weft flat tape of fiber reinforced thermoplastics on a power driven loom. The weft tape is supplied in a twistless manner from a rotatable package that is driven in synchronism with the feeding mechanism and a finite tension on the tape is maintained so that a line drawn parallel to the surface of and perpendicular to the longitudinal axis of each of the warp and weft tapes is in the plane of the fabric throughout the fabric. The warp and weft tapes have edges that abut substantially throughout the fabric.

Abstract: A device for detecting weft yarn breakage is adapted to be positioned upstream of a weft yarn feeding and storage device, and comprises a signal generator which directs the stoppage of the loom after a predetermined delay time T has elapsed from the moment at which weft yarn breakage is detected. The device comprises an electronic circuit including components which receive signals representative of the speed of the motor shaft and detection of weft yarn breakage. In one embodiment, the motor speed signal is fed to a counter-divider upon detection of weft yarn breakage, which in turn generates a signal after a time inversely proportional to the motor speed. This signal can be fed to a monostable circuit which generates the pulse for stopping the loom, the delay time T being in relation to the detected speed of the motor of the weft yarn feeding and storage device.

Abstract: A method and apparatus to adjust the motor speed in yarn feeders for textile machines and, in particular, weft feeders for weaving looms, wherein a yarn reserve is wound on a rotary drum held stationary, by a winding arm rotated by the motor. Photoelectric cells positioned close to a yarn outlet end of the drum emit signals which adjust--in cooperation with detection of the rotations of the winding arm--the motor speed of the feeder. These signals differ from each other according to whether an advancing turn of the yarn reserve intercepts a luminous beam for a relatively long period of time or whether yarn drawn from the reserve by the loom intercepts a luminous beam for a relatively short period of time. These signals are discriminated so as to adjust said speed, so as to guarantee the constant presence of an adequate yarn reserve on the drum.

Abstract: In a fluid jet loom, a weft inserting condition such as a fluid jet pressure is controlled by a feedforward control in which a change of a weft yarn condition due to interaction between the weft yarn and fluid jet is detected, and an anticipating corrective action is taken before the weft yarn is allowed to move into the shed.

Abstract: A weft feeding device, for weaving looms, of the type comprising a drum for winding the thread and an array of metallic laminas for braking the thread which unwinds from the drum. The metallic laminas are arranged on the surface of a rotational paraboloid. The paraboloid is fitted on the drum and is tangent thereto, to elastically engage a thread, at its own minimum-radius circumference. The paraboloid has one end rigidly coupled to a fixed supporting ring which encircles the drum, the other free of the paraboloid end being subject to the action of a movable ring which, when moved axially with respect to the paraboloid, varies the paraboloid's curvature in order to correspondingly vary the contact pressure of the laminas on the thread.

Abstract: A weaving machine is of the type in which the weft thread remains attached to the edge of the cloth between successive picks, the weft thread moving along with the cloth as the weaving process progresses, and in which detection of a thread break causes deactivation of a corresponding thread preparation mechanism and transfer of its task to another thread preparation mechanism. The weaving machine includes a monitoring device which, in the case of a thread break, sets a limit as to how much further the broken section of weft thread which is attached to the cloth can move. The monitoring device supplies an output signal so that further action can be taken to prevent further movement of the broken weft thread along with the cloth.

Abstract: A jet loom comprising a weft measuring roller for continuously drawing out a weft from a supply package, a weft storage unit for temporarily accumulating and storing the weft drawn out from the supply package by the weft measuring roller, a main nozzle for jetting air to insert the weft into the warp shed, and a driving unit for sinusoidally varying the rotating speed of the weft measuring roller. The weft stored in the weft storage unit runs in a free running period in a free running mode at a comparatively high running speed. After the stored weft has exhausted, the weft is supplied for insertion directly from the weft measuring roller, so that the weft runs in a constrained running mode at a running speed constrained by the surface speed of the weft measuring roller.

Abstract: A yarn storage device is provided having a storage drum and a ring surrounding the storage drum. It also has a plurality of yarn stop devices each having a blocking element, which is adapted to be introduced into an annular gap between the storage drum and the ring upon actuation of the yarn stop device. A withdrawing device for the blocking element, which removes the blocking element from the gap after termination of the activation of the yarn stop device, comprises a belt of resilient material.

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: In a multicolor air jet loom, a weft color which because of its long weft yarn repeat does not require picking for a considerable period of time and whose free end is damaged by the retaining air flow in the picking nozzle, is picked with an excess length equal to the damaged yarn part in the nozzle. The damaged portion of yarn is therefore not woven in and the resulting cloth has a defect-free edge zone.

Abstract: A weft yarn measuring method controls the picking device of a fluid jet loom so as to pick a weft yarn of a predetermined length in each picking cycle. In releasing loops of the weft yarn wound on the storage drum of the picking device, the retaining pin of the picking device is controlled so that only one of the loops of the weft yarn is unwound at each reciprocation of the retaining pin, and the reciprocation of the retaining pin is repeated a plurality of times to unwind accurately a plurality of loops of the weft yarn corresponding to a predetermined length of the weft yarn necessary for one picking cycle.

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: A casing for weft storage and feeding devices for use in weaving looms comprises a central body housing the motor; and a peripheral arm guiding and supporting the brake unit, the sensor detecting the yarn reserve, and the yarn-guide eyelet. The casing is formed from at least one extruded section length.

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: The weft bobbin changer comprises a bobbin turntable comprising a delivery bobbin and at least one reserve bobbin. A sensor continuously monitors the quantity of yarn on the delivery bobbin. Only when the adjustable minimum quantity of yarn on the delivery bobbin has been reached is a piecing-up operation performed to join the yarn of the deliver bobbin to the yarn of the reserve bobbin. The yarn of the previous delivery bobbin being severed between the delivery bobbin and a yarn joint which has been or will be made is such that the previous reserve bobbin becomes the new delivery bobbin. The minimum yarn quantity for high-quality fabrics can therefore be greater than previously without loss of material and the yarn residues left on the bobbin can be further processed in lower-quality products.

Abstract: A picking controller capable of automatically controlling the retaining member of the weft yarn measuring and storing unit of a picking device and the modes of operation of subnozzle groups respectively composed of subnozzles detects an actual arrival phase at which a picked weft yarn arrives at a fixed position on the arrival side of the loom, and then compares the actual arrival phase with a reference arrival phase to obtain the angular difference between the actual arrival phase and the reference arrival phase. The controller then determines a picking phase on the basis of the angular difference, and determines a releasing phase at which the retaining member is to be retracted so as to release the weft yarn stored on the measuring and storing drum of the weft yarn measuring and storing unit.

Abstract: A device for the automatic control of the weft yarn feed in air looms which includes a weft yarn feeder and sensors to sense the time required for each turn of the weft yarn leaving the feeder to unwind. The sensors generate a signal which is received by an analysis circuit associated with a programmable control circuit which controls the feeding of the weft yarn. The feeding of the yarn can be varied based on differences in the physical characteristics of the yarn which effect the operation of the loom.

Abstract: A weft feeding device for weaving looms regulates the motor speed, according to the amount of yarn wound on the drum at least two photoelectric cells (11, 12) are provided one of which (11) checks the amount of yarn (3) wound on the drum (1), while the other (12) measures the transparency of the protection glass (15) provided on the cells. These photoelectric cells (11, 12) cooperate with an electronic circuit, which processes their signals (31, 32) in order to automatically compensate the transparency variations in the protection glass (15), thereby allowing a more uniform regulation of the motor speed of the weft feeding device.

Abstract: A method for repairing a break in a weft thread which occurs before the thread accumulation space of a weft accumulator includes the steps of drawing the thread reserve present in the weft accumulator after the break back towards the end of the thread which is connected to the yarn package, and subsequently joining it thereto. A weaving machine for practicing the method includes a detection device for detecting a break in the weft thread, a threading device for drawing the thread reserve in the weft accumulator back towards the remaining weft thread, and a thread joining device.

Abstract: A new weft yarn is supplied to a predetermined position in case when the weft yarn in a control unit, particularly in a loom, is broken. Conventionally, the supply of the new weft yarn is effected by a weaver. The present invention provides a yarn guide device for positioning, holding, and transferring a yarn to a predetermined position. The yarn in then drawn inside of a guide tube located in a predetermined position, and thereafter the yarn is automatically guided to a required device such as a measuring and storing device for the weft yarn.

Abstract: The weft yarn leaving a drum of a weft yarn store of a loom is monitored by a monitor device disposed between the drum and a yarn eye in the zone of the yarn balloon. The monitor device includes a ring with an internal surface across which the yarn balloon slides during take-off. At least one light transmitter is mounted in the ring to emit a light beam across the path of the yarn and at least one transmitter is also mounted in the ring to receive the light beam for sensing when the yarn passes through the beam.

Abstract: The weft yarn store includes a stationary drum for a supply of weft yarn as well as an electromagnetic yarn clamp for retaining the weft yarn on the drum periphery. The clamp includes a locking pin which is connected to an armature of the electromagnet for pressing a yarn against an abutment surface of the drum. The electromagnetic yarn clamp is also provided with apertures through which cooling air may flow into and through the clamp in order to cool the winding and armature. In addition, the cooling air may be directed onto the abutment surface of the drum to keep this area free from deposits of fluff.

Abstract: To provide for accurately timed injection of selected lengths of weft threads to shuttles moving, in sequence, in front of injectors (85, 545), a continuously rotating measuring drum (32) has the weft thread (51, 180) passing in front thereof, the weft thread being clamped against the measuring roller by a pressure roller (35) or a selected one of a plurality of pressure rollers (511), the operating mechanism being coupled to and driven by the main drive (21, 22, 23, 24) of the weaving loom so that exact synchronism of movement of the shuttle in front of the injectors is ensured as the thread is being delivered.

Abstract: The weft yarn store comprises a rotating winder and a stationary drum adapted to receive a yarn winding. A drive in the form of a motor or magnets is disposed at least to some extent inside the drum to activate an adjusting sleeve to move the stirrups of the drum. The power required for the drive is transmitted without contact. Consequently, the effective diameter of the store drum can be adjusted while the store is in operation and automatically.

Abstract: The yarn metering drum has a plurality of radially moveable segments, a pair of edge discs at the longitudinal ends of the segments and elements disposed of the longitudinal ends of the segments which are spaced apart a distance less than the length of a base of a segment in order to define a winding zone of the drum. The elements may be made integral with the edge discs or with the radially moveable segments. The elements prevent damage to the yarn by preventing the yarn from winding behind or below the segments.

Abstract: The weft yarn leaving a drum of a weft yarn store of a loom is monitored by a monitor device having at least two pairs of transmitters and receivers in a monitor ring which output signals to an evaluating unit (W) independently of one another in accordance with the number of yarn windings drawn off the drum. The dual delivery of signals is evaluated in an evaluation unit so that interfering signals can be distinguished from genuine malfunctionings, such as yarn breakages, so that unnecessary interruptions in operation can be avoided.

Abstract: The present invention relates to a control system for an engagement pin employed in a drum-type weft storage unit which is mainly employed in a jet-loom for storing the weft and for measuring the same in length. A novel control system for an engagment pin employed in a drum-type weft storage unit is provided. An engagement-time is compensated on the basis of a difference in time between a target-time later than the engagement-time of the engagement pin by a normal time-lag, to make it possible that the engagement-time is always set to be optimum in spite of the existanece of variation in shuttling speed of the weft, so that it is possible to keep the variation in length of the delivered weft minimum while the weft feeler is employed in place of the disengagement sensor.

Abstract: A method of producing a continuous slide fastener strip by weaving on an automatic needle loom, warp yarns for support tape and warp yarns for tying-in being guided to form sheds, weaving needles being used to pick weft yarns for the support tape and a plastics monofilament yarn. A weaving needle which reciprocates continuously between an outside position and an inside position is operative to loop the plastics monofilament yarn around a former for forming coupling members, a row thereof being formed continuously from the latter yarn, the coupling members of such row each comprising a coupling head and connected arms which form a coupling loop and being joined together by connecting parts.

Abstract: Method for repairing the thread supply in weaving machines in the event of an interruption between the weft thread supply package and the weft accumulator, with the characteristic that it consists essentially of: seizing an existing thread portion at a particular point of the thread supply on the weft accumulator drum; removing the portion of thread between this point and the point of the interruption; taking a new thread end from the same weft thread supply package or another and leading it to the old weft thread end; and joining the new end to the old end.

Abstract: A picking controller for an air jet loom having a main picking nozzle which jets air to pick a weft yarn into a shed, and groups of subnozzles which jet air to help the picked weft yarn run along a picking path, includes a phase angle detector for detecting the phase angle of the air jet loom and a weft yarn arrival detector for detecting the arrival of the free end of the picked weft yarn at an arrival position. It also includes a memory for storing actual arrival phase angles of the picked weft yarns with respect to the phase angle of the air jet loom and a variation detector for determining arrival phase angle variations. A comparator compares the phase angle variations with a predetermined target phase angle variation and provides a signal representing the result of the comparison. A picking condition setting unit sequentially varies the picking condition of the groups of subnozzles according to the signal from the comparator representing the result of comparison.

Abstract: An automatic picking regulating method and an apparatus for carrying out the same are applied to controlling the sequential air jetting operation of the auxiliary nozzle groups of an air jet loom. The auxiliary nozzle groups are arranged along a picking path to jet air so as to assist a picked weft yarn in running along the picking path. The respective jet phase angles of the auxiliary nozzle groups are regulated automatically according to the acutal running speed of the picked weft yarn. The acutal running characteristics of the picked weft yarn are determined on the basis of a holding pin retraction phase angle, namely, a weft yarn release phase angle, and an acutal yarn arrival phase angle measured at a position on the yarn arrival side of the air jet loom, and are represented by a graph showing the relationship between the phase angle of the main shaft of the air jet loom and the picking distance.

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: In a fluid jet loom, almost all the faulty picks are attributable to defects in the quality of the weft yarn. The present invention detects matters for evaluating the physical properties of the weft yarn or matters for evaluating the result of the picking operation during the picking operation, discriminates the quality of the yarn package on the basis of data obtained through the detection, and automatically changes the yarn package for a new yarn package when it is decided that the yarn package feeding the weft yarn at present is defective.

Abstract: A picking control method includes the steps of detecting a change in the supply yarn package during the weaving operation, preferentially setting a specific checking pin retracting time in which the checking pin is to be retracted for picking cycles for a predetermined time period after the detection of the change of the supply yarn package, and controlling the advancing and retracting operation of the checking pin on the basis of a new checking pin retracting time. A picking controller for carrying out this method has a supply yarn package change detector for detecting the change of the supply yarn package and for issuing a supply yarn package change detection signal, an initial data setting device for providing a checking pin retracting time in which the checking pin is to be retracted to release the weft yarn supplied from the new supply yarn package and wound on the measuring and storing drum, a data updating device generating a checking pin retracting time, a memory device, and a control unit.

Abstract: A weft yarn store for a loom comprises a drum adapted to receive a weft yarn supply, a winder for winding weft yarn on the drum and means for retaining the weft yarn at the runoff end of the drum upon the completion of picking. A retaining element of the retaining means is adjustable by means of a controllable drive in the peripheral direction of the drum. When this element moves together with the running-off yarn during the braking thereof, the yarn can be retained smoothly. The weft yarn can therefore be metered accurately and smoothly.

Abstract: A weft yarn store (1) for looms (3) stores weft yarn (2), the yarn coming from a package disposed outside the store, on a stationary drum (13) having a first winding zone (135) and a second winding zone (136). While a first winder (12) winds yarn (21) on to a first winding zone (135) so that a yarn supply (21) is permanently available, the second winder (14) intermittently or variably unwinds yarn from the first winding zone towards a second winding zone (136). In a preferred operation of the store (1) together with a loom (3), yarn which is from the second winding zone (136) and which was deposited there by the second winder (14) is picked into the loom. After consumption of this supply and until the termination of the same pick, yarn is unwound directly from the supply in the first winding zone (135) by means of the second winder (14) and supplied to the loom (3) without intermediate storage.

Abstract: A weft yarn insertion apparatus for a weaving loom, the apparatus including a main fluid nozzle for inserting a length of weft yarn into the warp shed, a pair of nip rollers, for positively feeding the weft yarn into the main nozzle, the nip rollers being located immediately upstream of the main nozzle to enable the nip rollers to propel the leading end of the yarn through the nozzle and into the shed, and a weft yarn guide immediately upstream of the nip rollers, the guide being movable to selectively introduce and withdraw the weft yarn beteween the pair of nip rollers. The rollers are driven so as to project the weft yarn into the shed at a speed in excess of the given speed normally imparted to the yarn by the main nozzle when the yarn is introduced between the rollers. When withdrawn, the rollers permit the nozzle to project the yarn at the given speed.

Abstract: A yarn storing and feeding device having a stationary storage drum onto which an intermediate yarn store is wound by a winding-on device, and from which the yarn is withdrawn through a gap around the withdrawal end of the storage drum. At least one yarn stopping device is associated with the gap for controlling the withdrawal of yarn. The stopping device includes a stopping element arranged radially inwardly with respect to the gap, and movable radially outwardly to extend across the gap in response to a magnetic actuator located radially outwardly with respect to the gap.

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 weft yarn store for looms has a stationary drum (10) for storing a weft yarn supply (23) and a braking device (13) at the end of the drum. A resiliently deformable brake element (132) is movable by means of an adjusting device (131) relatively to a braking surface of the drum. The adjusting device may be an annular electromagnet 131 and is in direct operative engagement with low-inertia parts of the brake element 132. Such parts can be finger-like lamellae disposed one beside another on the outer drum periphery (10). The action of the braking device can therefore be accurately adjusted to the departing weft yarn so that the same is retarded gently at the end of picking into a loom.

Abstract: A device for surveying the insertion of a weft yarn in a shed of a jet loom, comprises an arrival sensor arranged at one end of said shed for detecting the arrival of weft yarn there. The arrival sensor and at least one yarn sensor are connected to a surveillance circuit measuring the period of time lapsed since releasing a stopping device and periodically correcting the measured period of time on the basis of the yarn sensor signal. The surveillance circuit only generates a signal indicating the completion of the weft yarn insertion if the following two conditions are simultaneously fulfilled: The measured period of time exceeds a predetermined period of time between 80% and 99.5% of the period of time required for a complete weft yarn insertion cycle, and the arrival sensor generates a signal representing the arrival of the weft yarn.

Abstract: A device for storing a weft yarn for inserting in a jet loom, which is provided with a weft yarn retaining surface, is movable relative to a feed nozzle, for receiving a weft yarn ejected from the feed nozzle. The device is characterized in that a blacking member is arranged in such a manner that one end of the member is engaged with the weft yarn retaining surface at a depositing zone adjacent to the feed nozzle so as to block the fluid from the nozzle as would otherwise disturb the yarn deposited on the retaining surface. A gap is formed between the weft yarn retaining surface and the cover, which gap increases as a position moves away from the depositing zone towards the side where the stored weft yarn is withdrawn.

Abstract: A loom is provided with a weft inserting nozzle for picking a weft yarn under the influence of fluid jet and equipped with a weft picking control system which consists of a device for detecting the tension of the picked weft yarn at a timing of termination of travel of the weft yarn in weft picking. The thus detected weft yarn tension is compared with a standard tension by a comparing device forming part of a control circuit thereby to obtain the difference therebetween. The pressure of air to be supplied to the weft inserting nozzle is controlled in accordance with the difference in tension, thus maintaining the weft yarn tension at a constant value.

Abstract: A method of removing a mispicked weft yarn when a mispick occurs in a loom. The operation of the loom in a state where the mispicked weft yarn is connected to weft inserting means after the mispicked weft yarn is beaten up by a reed. The mispicked weft yarn is exposed at the cloth fell of a woven cloth. A weft yarn connected to the mispicked weft yarn is inserted from a weft picking side to a counter-weft picking side of the loom. The inserted weft yarn is drawn together with the mispicked weft yarn to the counter-weft picking side, thereby effectively peeling off the mispicked weft yarn from the cloth fell.

Abstract: A weft yarn store for a loom includes a stationary drum (24), a winding arm (3) for winding weft yarn (20) on to the periphery of the drum, and a separating device (11) which separates groups of yarn turns (21, 22) from one another. A clamping facility at the weft yarn departure end of the drum (24) determines the release of a length of yarn for picking into the loom. The clamping action is accomplished by such a lever (14) mounted within the drum and working against an element (15a) mounted outside the drum (24). The outer clamping element is resiliently mounted in a retaining element (16) which secures the drum (24) against rotation. The clamping facility (14, 15a) enables the weft yarn to be retained gently in a reduced space.

Abstract: The present invention relates to a method for controlling a yarn storing, feeding and measuring device, having a stationary storage drum, a yarn sensor and at least one yarn stopping device, wherein the method includes the determining of the number of pulses which are to be generated by the sensor before actuating the stopping device.The reliability and speed of the device is enhanced by actuating the stopping device with a pre-determined delay-time after receipt of the pulse, the number of which corresponds to said pre-determined number.

Abstract: An air jet loom is equipped with a weft storage device for detaining a weft yarn prior to weft picking through a weft inserting nozzle. The weft storag device includes a roller reel on which the weft yarn is wound in the shape of a coil. The roller reel consists of a plurality of rollers arranged in the shape of a reel in which the axis of each rollers is outside any of planes containing an axis of the roller reel. Some of the rollers are driven around their axis. An engaging member is movably disposed in the vicinity of the unwinding end section of the roller reel and normally engaged with the weft yarn but disengaged from the weft yarn during weft picking, thereby sharply reducing weft picking resistance applied the weft yarn to be picked into the shed of warp yarns.

Abstract: A loom having a drum type weft reservoir including a drum on which a predetermined length of a weft yarn is wound to be measured and reserved prior to weft picking. The weft reservoir is automatically prepared for loom starting by merely operating a manual switch. The local includes a clutch which is engaged at a predetermined operational phase of the loom to drive the weft reservoir. If the manual switch is actuated when the clutch is disengaged, then the clutch is engaged at a second time substantially later than the first time at which the predetermined operational phase is reached. Any cut, broken or unnecessary weft yarn remaining wound on the drum when the switch is actuated is removed during the interval between the first and second times, e.g. by pulling the weft yarn from the side of a weft inserting nozzle.

Abstract: In a picking apparatus comprising: a weft yarn measuring and storing device including pick length adjusting mechanism capable of varying pick length, for winding a weft yarn on a weft yarn measuring drum to measure and store the weft yarn on the weft measuring drum; a picking nozzle for inserting the weft yarn released from the weft yarn measuring drum into a shed of warp by means of a fluid jet; and a weft yarn detector disposed at a fixed position on the weft yarn arrival side, outside and near the warp; a pick length setting method comprising: a data input process in which data at least including a target adjustment length is given to calculating means; a calculating process in which data corresponding to the target adjustment, for adjusting the setting of the pick length adjusting mechanism is obtained through calculation; a pick length adjusting process in which an initial pick length is diminished or increased gradually during tentative picking operation to a pick length which causes the weft yarn detec