Abstract: A weft feeding device which alleviates an excessive tension acting on the weft upon feeding of the weft and inhibits breakage of the weft includes a gripper to grip the weft at prescribed times, a length measuring roller located downstream of the gripper, and a pinch roller to hold the weft against the roller at prescribed times. Opening and closing of the gripper is linked with movement of the pinch roller into and out of contact with the length measuring roller. A linear or a rotary solenoid is provided to operate the pinch roller and the gripper by a pulse width modulation method or a linear method.

Abstract: A controllable output brake for a thread feed device includes actuating elements that are connected to a control member and are used for effecting a controlled displacement of a thread brake element. The controlled displacement is an axial play with which a supporting ring for the thread brake element is supported in a holding member. The controlled displacement is used for controlling the tension of a thread. In the case of such a thread feed device, a push drive connected to the holding member is provided for each direction of movement in which the thread brake element is adjusted. The push drive for at least one direction of movement is a pneumatic push drive connected to a pneumatic drive control unit. In a projectile weaving machine, the controlled output brake is disengaged and re-engaged approximately in synchronism with a controlled thread brake which is provided as well. The engagement is preferably carried out in advance of the engagement of the controlled thread brake.

Abstract: A projectile or gripper shuttle loom includes a weft-yarn delivery device with an overend-unwinding delivery unit that has a stationary, brakeless drum, a withdrawal eye arranged coaxially downstream of the drum and a yarn brake controlled in accordance with the loom cycle. The thread path is enclosed by at least one hollow body extending from the circumferential face of the drum to the withdrawal eye at least in one axially limited segment. The hollow body has on its inner side coaxial to the drum axis a plurality of ballooning, disturbing and braking elements which protrude inwards without touching the drum while forming projections and deposit surfaces for the weft yarn.

Abstract: For determining the movement of a thread supply boundary on the storage surface of a thread storage and feed device, different scanning properties of at least two circumferentially offset circumferential sections of the storage surface are scanned simultaneously and converted into storage surface signals which are nonidentical among themselves and which are discriminated from thread signals which are identical among themselves. The thread signals are generated by sensors which scan a scanning zone on the storage surface and formed on the basis of a scanning property of the thread windings when the thread supply is present in the scanning zone. The thread storage and feed device is provided with first and second circumferential sections on the storage surface differing from one another with respect to their scanning properties, and a plurality of sensors.

Abstract: A yarn braking device includes a resilient annular braking element having provided therein a circumferentially extending braking surface. The braking surface is adapted to be moved into contact with a circular draw-off area of a yarn storage drum under the influence of an axial biasing force. The yarn braking device also includes an annular carrier provided on the braking element, and a stationary Cardan holding device used for supporting the braking element which is movably supported via first and second Cardan axes, and for applying the biasing force thereto. The second Cardan axis is formed of pairs of contact areas provided on the annular carrier on the one hand and on a support ring on the other. The pairs of contact areas are adapted to be detached from one another and to be pressed onto one another by means of the biasing force wherein the support ring is supported in the Cardan holding device such that it is tiltable about the first Cardan axis.

Abstract: The invention relates to a thread feeder device with continuously adjustable thread extraction tension for textile machines, particularly for textile machines having uneven thread consumption, with a storage body that carries the thread without slippage and is directly or indirectly actuated by a motor and whereon the thread, in order to form a storage reserve winding, is wound tangentially and (according to requirements) is unwound axially between its front face, provided as a braking surface, and a complementary braking surface that rotates in the same direction. According to the invention, the complementary braking surface is formed by a thin, flexible circular disk the diameter whereof is slightly larger than the diameter of the front face of the storage body. The elasticity of this disk is used to achieve a more uniform thrust pressure on each point of the braking surface of the storage body, and to secure the thread more or less tightly by means of a more or less intense thrust pressure, i.e.

Abstract: A pre-unwinding device for use in a spoolless weaving loom, using a weft injector, includes a winding body with a variable adjustable diameter situated within a thread receiving cylinder in which a thread stopping device can be activated. A receiving cylinder and a stopping device are movable in a plane which is almost perpendicular to the axis of the winding body.

Abstract: Device to control the yarn at the outlet of yarn feeders, particularly antiballoon device for weft yarn feeders of looms, of the type consisting of an element (10) having a substantially frustoconical surface. A plurality of ribs (11) project from the inner wall of said element, substantially extending along the generatrices of its surface.

Abstract: Yarn feeding device for projectile or gripper looms, having a drum (D) to store the yarn (Y), an inclined annular deflection surface (G) at the free front end of the drum (D), a circumferentially continuous and yielding conical braking surface (B) at the wider end of a hollow conical brake carrier (C), pressed in contact with the deflection surface (G). The brake carrier (C) is supported at its smaller end onto a stationary part (P) and the braking surface (B) is adjustable with respect to the deflection surface (G), according to the yarn unwinding speed, so as to compensate for any tension increase in the yarn (Y), and an annular counterdeflection surface (H) for the yarn (Y), downstream of the deflection surface (G) and coaxial to the drum (D). The inside diameter of the counterdeflection surface (H) is smaller than the outside diameter of the deflection surface (G).

Abstract: Yarn feeder, especially to feed the weft yarn to gripper or projectile looms, wherein the weft yarn is unwound from a weft yarn reserve wound on a drum, onto the outlet end of which there acts a yarn braking device upstream of an outlet yarn guide. The yarn braking device, centered on the drum axis and adjustable along the drum, comprises a frustoconical braking element having a continuous surface and varying flexibility, especially along its generating lines. The yarn braking device is carried by a stiff ring support to which it is fixed close to its major circumference. The support is in turn fixedly mounted onto a bracket of the yarn feeder, the position of which is adjustable along the drum axis.

Abstract: A weft feeder in which a variable-diameter drum receives from a windmilling arm multiple turns of thread that form a weft reserve, and in which a variable-diameter swift is associated with the drum to transport the turns from the base of the drum to its head; the swift is formed by multiple rods which protrude in a cyclic manner from corresponding slots of the drum; the extent of the protrusion of the rods from the slots determines the mutual distance between the turns of the thread reserve. The swift and the drum are formed by corresponding sectors that are radially movable and are controlled by respective radial shifting mechanisms, each of which comprises at least one actuation gear that meshes with individual gears for shifting the respective drum and swift sectors. The pair of actuation gears is turned by a single transmission element which is controlled by an actuation knob that is also used to vary the extent of the protrusion of the rods.

Abstract: A thread feed system having a measuring feeder, a supply bobbin supplying thread to the measuring feeder and a textile machine which withdraws the thread from the measuring feeder so as to perform a weaving operation. The measuring feeder includes a storage drum and a winding element which removes the thread from the supply bobbin and winds the thread onto the storage drum. A control device is provided for monitoring the operating conditions of the thread system so as to identify increases in thread tension. The control device is operatively connected to an auxiliary conveyor device having a drivable friction roll which is frictionally engaged with the thread between the supply bobbin and the storage drum. The auxiliary conveyor device is operable so as to provide an increased frictional action on the thread so as to advance the thread at an increased rate to the storage drum so as to preparatorily counteract the thread tension increase and eliminate short picks of the thread in the textile machine.

Abstract: An insertion system for the weft yarn of a jet loom, comprising a jet insertion device in the jet loom for withdrawing the weft yarn and for transporting the same into a shed, and a weft-yarn storage, supply and measuring device arranged upstream of the jet insertion device. The weft-yarn storage, supply and measuring device including a weft-yarn stopping and releasing device which is controllable in response to a weaving cycle. The insertion system also includes a mechanical weft-yarn slip conveyor arranged in the yarn path of the weft-yarn stopping and releasing device relative to the jet insertion device, which comprises at least on conveyor roller rotating in the insertion direction of the weft yarn at a faster circumferential speed than the maximum weft-yarn insertion speed and can be deactivated while the conveyor roller is rotating during the insertion process.

Abstract: Device to feed yarn to machines making use thereof, particularly the weft yarn (T) to gripper or projectile looms, of the type in which the yarn to be feed is unwound from a reserve (R) wound on a drum onto the outlet end of which, where a first yarn deviation takes place, there acts a brake device (FR) which is centered on the drum axis and adjustable along the same, upstream of an outlet yarn guide where a second yarn deviation takes place. The brake device (FR) comprises a frustoconical braking element with continuous surface and differentiated elasticity, carried by a stiff ring support to which it is fixed close to its major circumference, and the stiff ring support is mounted so as to oscillate about two axes (S1, S2) which are perpendicular one in respect of the other and both in respect of the axis of the drum.

Abstract: A weft-thread measuring feeder comprising a storage drum for a thread stock consisting of tangentially wound turns, from which a thread can be withdrawn overend in sections of a predetermined length. The storage drum includes a power accumulator which can be triggered from outside the storage drum for temporarily extending a spreading body which is positioned below the turns of thread stock and is defined circumferentially.

Abstract: A weft feeder comprising weft sensors with movable magnetic elements that cooperate with respective detectors located outside the feeder drum; the detectors react with a signal, without contact, when the position of the corresponding weft sensor changes. Each detector in turn comprises an acquisition sensor capable of providing an analog signal, in terms of voltage, that can vary in a linear manner as the angular positions of the movable magnetic elements of the weft sensors vary. The acquisition sensors are operatively connected to a microprocessor for controlling the motor of the feeder, which is programmed to automatically set the values of the weft presence threshold and of the weft absence threshold and to filter the values of said signals.

Abstract: In a yarn feeder (2), the yarn feed may be effected by a yarn reserve (11) support spool (2), which is arranged to rotate by means of a motor (60). The yarn is taken up by and unwound from the spool as the latter rotates. Unwinding of the yarn reserve on the spool is not controlled. The size of the yarn reserve is monitored and yarn take-up is controlled accordingly. The unit also includes electrically contactless sensing and control devices (3), which are preferably located immediately adjacent to the rotary spool. The unit (3) is designed to sense the presence and quantity of yarn on the yarn reserve support surface (10) of the spool. The unit also controls the said motor.

Abstract: A rotatable thread arrester, associated with a thread feeder, includes an arrester finger for the thread that is movable with respect to the reel of the feeder under the control of a movement device and engages the thread so as to stop its unwinding from the reel and viceversa in order to damp the peak of the mechanical tension generated on the thread by the contact with the arrester finger. The arrester finger is oscillatably suspended about an axis "x" that is parallel to the axis "y" of the reel and is controlled by the action of a motor which rotates the arrester in the thread unwinding direction, so that the arrester finger, in the arresting position, follows the thread unwinding from the reel.

Abstract: A thread storage device having a storage drum (1) from which a supply of thread can be withdrawn overhead through a thread take-off eye (5) which is arranged spaced from the end (1') of the drum and having a brake ring (8) which is arranged coaxial to the storage drum, with brake member (2) acting on an edge region (4) of the drum on the thread take-off side, the axial position of the thread take-off eye (5) and brake ring (8) being adjustable relative to the storage drum. In order to be able to effect a finer adjustment of the braking action, the thread take-off eye (5) is displaceable in axial direction relative to the brake ring (8) in such a manner that, with constant brake action of the brake member (2) which merely prevents ballooning, the thread application (alpha 1, alpha 2) on a radially inwardly curved section (3) of the drum is adjustable.

Abstract: From a weft feeder (AT), weft yarn (T) is unwound from a reserve (R) on a drum (3) located at an outlet end of the weft feeder (AT). A yarn-braking device (1) includes a frustoconical braking element (6) with varying flexibility and a cup support (8) with an open base. The braking element (6) has narrow tongues (7) placed side-by-side. In the braking element (6), the tongues (7) join together, at a major circumference, into a band (6A) with a smoothly and strictly continuous surface engaging an outlet end of the drum (3), while they are free and freely bear, at a minor circumference, against an inner periphery of the cup support (8). The braking element (6) is connected to the cup support (8) such that the former can be deformed and/or perform limited movements in every direction. An outlet yarn guide (4) is separate from the braking element (6) and is kept motionless, coaxial to the drum (3), while braking takes place.

Abstract: An apparatus and method for correcting an irregularity during the insertion of a weft yarn into a weaving rotor of a series shed weaving machine involves drawing a length of weft yarn from a supply unit and delivering the weft yarn to the weaving machine in synchronicity with the weaving cycle. The length of weft yarn is inserted into a weft yarn conveyor apparatus and wound around a conveyor roller. A sensor is positioned between the supply unit and the conveyor apparatus to detect a weft yarn interruption, e.g., as a result of a weft yarn breakage or the yarn running out of spool. When the interruption is detected, the conveyor roller continues to deliver weft yarn stored in the storage apparatus until a complete weft yarn insertion into the weaving machine has taken place (i.e., weft yarn having a single loom width). The weft yarn is then cut at the insertion side of the weaving machine and the weaving machine is stopped.

Abstract: In a thread regulating wheel (F), a storage body (B) is rotatably mounted on a shaft (1) that can be rotated in a housing, and mutually oriented holding magnets (8, 9) mounted in the housing (G) and on the storage body (B) position the storage body (B). At least one oscillating body (K) movably arranged in relation to the storage body (B), linked by friction (R) thereto, is associated with the storage body (B) and acts as a damping mass (m).

Abstract: Device for positive modulated braking of weft feeder thread, including a braking body, typically a frustum-shaped braking body, that is supported frontally and coaxially to the drum of the feeder in order to directly or indirectly engage the thread that unwinds from the drum. The braking body is subjected to the action of an electromechanical actuator, supplied by an excitation current that is modulated so as to match the variation in the mechanical tension of the thread during the weaving process; the braking body is rigidly coupled to a support that is movable in the axial direction of the drum of the feeder and is supported and guided by a fixed support.

Abstract: A thread storage (1) having a substantially cylindrical storage drum (2) for the receiving and delivery of circumferentially deposited turns of thread (3), having a central thread withdrawal eye (4) for the overhead withdrawal of the thread (5), and having a brake surface (8) which rests under spring load on a frustoconical withdrawal slide surface (6) associated with the withdrawal-side end region (2') of the drum, which brake surface is formed by the inner side of a frustoconical brake strip (9) of flexible material. In order to make the withdrawal of the thread uniform and counteract wear and deformation of the brake surfaces, the frustoconical brake strip (9) rests flushly on the frustoconical withdrawal slide surface (6), the thread being withdrawn tangentially through the flushly engaging surfaces.

Abstract: A method and apparatus is provided for manufacturing a carbon fiber woven fabric by opening and closing a warp sheet formed of carbon fiber warps and by injecting wefts made of carbon fibers by water-jet into the warp sheet when the warp sheet is open. The accumulation of fluffs generated by abrasion between the weft and various guides is reduced by interrupting dispersion of water injected from the nozzle onto the weft as the weft travels from a bobbin to the nozzle, by sucking fluffs from the weft, and/or by causing contact between the weft and fluffs on the surface of the nozzle by loosening the weft, thereby making it possible to conduct a high-speed continuous operation.

Abstract: A device for separating reserve turns of thread on a weft feeder drum comprising a swift that is formed by a set of axial rods that partially and variably protrude from respective slots formed on the drum of the feeder by virtue of the compound motion applied to the swift by a bush that is associated with the drive shaft. The bush is supported by a recessed coaxial portion of the drive shaft, and a diametrical pin is provided which is arranged so as to cross said shaft and said bush, and to bring about a pivotal engagement between said shaft and said bush. The bush has a cylindrical and eccentric outer surface and an internal surface that is profiled so as to form two portions of truncated-cone surfaces. The bush can thus oscillate about the pin and be arranged at an angle with respect to the drive shaft. An actuation element is provided to vary the inclination of the bush when the bush is rotated with respect to the element, which is kept fixed by a pushbutton stop device.

Abstract: A device for feeding weft yarns to a weaving machine which includes a rotatingly driven retainer that is constructed such that it has little mass. The retainer is coupled to a rotary drive unit such that the retainer cannot move radially with respect to a storage drum axis so that, when viewed in the direction of circulation of the withdrawal point, the retainer continuously extends through a circulatory path ahead of the weft yarn. The rotary drive unit is additionally connected to a control device which controls the acceleration and deceleration of the retainer in accord with a speed profile and determines the process of weft insertion in the weaving machine.

Abstract: A weft supplier for shuttleless looms comprises a drum (6) for the yarn reserve put in rotation by a motor (30) through a clutch (2). The yarn is taken up from the reserve and transferred to a passage between the drum (6) and a cylindrical conical body (13) lying at a given distance on the drum outlet end. Said cylindrical-conical body (13) is rotated synchronously and without shiftings in relation to said drum (6) by means of permanent magnets (12, 16) on facing surfaces of said body (13) and drum (6). The drum (6) bears braking bristles (17) that insist on an area of the cylindrical conical body (13).

Abstract: A weft feeder for gripper or projectile looms allows an operator promptly to restore the continuity of a weft yarn from a yarn feed spool to members for weft insertion into a loom shed, in case of weft yarn breakage or interruption. Downstream of a first yarn guide outlet, there are mounted a double-leaf brake, a separating element, and a second downstream yarn guide eyelet. The separating element is controlled by an actuator so as to separate two brake leaves of the double-leaf brake and to form a duct to guide the weft yarn from the first eyelet to the second eyelet.

Abstract: A measuring melt felder (M) has a storage body (F) for the thread (Y) wound in turns (W) and at least one stopping device (S) outwardly associated to the storage body (F) that delimits a thread (Y) passage slot (A). A stopping element (P) capable of moving transversely through the passage slot (A) to a stopping position acts as a circumferential stop (B) for the thread (Y). The stopping device (S) has, associated with the stopping element (P), an adjustable thread clamp (K) for the thread (Y) held at the stopping element (P).

Abstract: According to a method and apparatus for controlling the insertion process of a weft yarn, the weft yarn is temporarily exposed to a braking friction and the yarn tension is mechanically picked-up. In order to prevent the friction from having a disturbing or damaging effect on the yarn, the yarn tension is only temporarily picked-up during certain phases of the insertion process, in order to derive information from the tension curve that is useful for the control of the insertion process. In a power loom, in particular a jet, rapier or gripper shuttle loom, a tension sensor for sensing the tension of the weft yarn can be switched during insertion between its sensing position and a passive position in which it does not touch the weft yarn. Preferably, the tension sensor is integrated in the insertion brake or even forms the braking element itself.

Abstract: A yarn storage and feed device with a main body, a take-up element on which the yarn is wound, a storage surface for yarn storage, a threading device with a compressed-air feeder system and a device for activating direction-jet nozzles. At least one direction-jet nozzle is located between the point of entry of the yarn into the storage and feed device and the feed-out point from the yarn-winding element; this nozzle can be activated independently of the nozzles fitted downstream of the feed-out point so that in the event of a partial failure, where stored yarn remains on the storage surface, the yarn end can be blown below the feed-out point.

Abstract: A weft picking system for an air jet loom is provided with a microcomputer as a controller. The weft picking system comprises a weft traction device including a pair of rollers, one of which is driven by an inverter motor. A weft yarn fed from a weft measuring and storing device can be placed between the rollers to be drawn toward a weft posture regulating nozzle. The weft posture regulating nozzle is arranged to project the weft yarn into the shed of warp yarns and regulates the posture of the weft yarn under the influence of air jet ejected from the nozzle and from a plurality of sub-nozzles. The rollers always rotate during a weaving operation of the loom. A change-over device is provided to change the weft yarn from a first state of being placed between the rollers to a second state of separating from the rollers or vice versa.

Abstract: A braking device and a system for braking thread being drawn off of a thread storage drum over its output circumference. The braking device includes a braking body having a band which is symmetric in shape around an axis and has a continuous active braking surface facing inwardly toward the axis, the surface being sufficiently hard to be resistant to wear from thread friction. An elastic member urges the band, and thus the braking surface, into engagement with an output circumference on the drum so as to brake thread passing through the braking body between the surface and the drum output curcumference.

Abstract: The weft winder for a weaving machine has (a) a non-magnetic, hollow-cylindrical outer frame member having an inner conical surface at one end thereof; (b) a rotor disposed rotatably and concentrically with the outer frame member, which is only rotatable; (c) a non-magnetic, inner frame member rotatably supported by the rotor and having an outer conical surface facing the inner conical surface of the outer frame member via a gap therebetween; (d) a pipe projecting from an outer end of the rotor and extending in the gap for guiding a weft; and (e) a plurality of magnet members each constituted by a plate-shaped magnet and a yoke and fixed to the inner conical surface and the outer conical surface, respectively, such that N poles and S poles of the magnets are circumferentially arranged alternately and that different magnetic poles of the magnet members are opposing each other via the gap.

Abstract: An electropneumatic device for the automatic threading of apparatuses for feeding weft to textile machines, and a weft feeding apparatus including the device. The device has first and second ducts for feeding pressurized pneumatic fluid. The ducts are cut off by a manually-actuated valve and end in thread inlet and outlet bushes to create a pneumatic flow and a consequent suction current which entrains the thread from one end of the feeder apparatus to the other. An intermediate open channel is arranged adjacent and parallel to the drum of the apparatus to convey the pneumatic flow and the thread entrained thereby in the free portion comprised between the radial arm outlet and a thread brake. A pneumatic pusher is fed by a third pneumatic duct and is arranged at the outlet of the intermediate channel. The pusher acts on a braking device to deform it and hinder elastic action applied to the drum, so as to guide the thread entrained by the flow through the braking device.

Abstract: An easily movable output brake system forms part of or cooperates with a yarn feeder (13) comprising a spatially fixed body supporting a yarn store, from which body a yarn (11) can be drawn off even at advanced speed through an output channel (10). The system comprises a first member (9) which is arranged in a bearing and which, in the functional operation of the system, by means of a surface clamps the yarn being drawn off against a counterstay member (15). The members (9, 15) are designed to effect a yarn-cleaning function dependent on the yarn rotation upon drawing-off, with simultaneous prevention of considerable accumulation of lint, particles etc., in respect of the members. The mobility of the system is obtained by the selection of the components in question.

Abstract: A weft picking system for an air jet loom provided with a microcomputer as a controller. The weft picking system comprises a weft traction device including a pair of rollers one of which is driven by an inverter motor. A weft yarn fed from a weft measuring and storing device can be put between the rollers to be drawn toward a weft posture regulating nozzle. The weft posture regulating nozzle is arranged to project the weft yarn into the shed of warp yarns while regulating the posture of the weft yarn, under the influence of an air jet ejected therefrom and under assistance of air ejection from a plurality of sub-nozzles. The rollers are always driven to rotate during a weaving operation of the loom. A change-over device is provided to change the weft yarn from a first state of being put between the rollers to a second state of separating from the rollers or vice versa.

Abstract: A yarn tension control system incorporated into a computerized control system of a textile machine for controlling the operation of a fast responding braking or friction device. The braking or friction device is positioned along a weft yarn path and includes a functional control unit operably coupled to the computerized control system, a tension sensing arrangement for sensing the tension of a strand of weft yarn passing therethrough, and a friction force applying arrangement for applying a friction force to the strand of weft yarn in dependence upon the tension sensed by the tension sensing arrangement.

Abstract: Tearing of a weft thread between the main nozzle and the insert side of the selvage or insert end of the loom shed is to be avoided when the weft thread has not been properly woven into the fabric. The detection of a faulty weft thread stops the loom and such stopping must not tear the weft thread. For this purpose the signal caused by a faulty weft thread for the loom stoppage is also used for holding available a defined length of weft thread, whereby thread tearing is avoided. The loom is provided with a prespooling device equipped with an electrically controllable thread stopper and a second thread stopper which is adjustable in the circumferential direction and radially on the thread winding body of the prespooling device for providing the defined weft thread length.

Abstract: The breaking device has a single truncated-cone braking body, supported by an elastic member coaxially and frontally with respect to a drum of a feed unit and is actuated by the elastic member so that it engages, with an elastic contact, against the drum along a circumference thereof which is smaller than the maximum circumference of the drum. The thread slides between the drum and the braking body and extends from a point of contact with the drum and braking body along a path which is inclined with respect to the axis of the drum, so that the tension produced by the braking body has at least one axial component which is discharged onto the braking body and is balanced by the elastic member. Increase in the tension on the thread produces, or tends to produce, by virtue of the corresponding increase in axial component, separation of the braking body from the drum with a corresponding self-adjusting braking action.

Abstract: When a weft yarn is broken between a fixed drum type weft yarn measuring and storing device and a picking nozzle, the weft yarn extending to a winding yarn guide is reliably delivered to a yarn suction device by the steps of generating an air current inside the winding yarn guide in the picking direction, generating an air current inside the yarn suction device in the drawing direction while the winding yarn guide is aligned with the yarn suction device disposed in front of the weft yarn measuring and storing device, and keeping a retaining pin from being advanced toward the drum. Thereafter the broken weft yarn on the drum is discharged by retracting the retaining pin.

Abstract: A method of operating a direct weaving apparatus which may include a loop provided with picking nozzles and a weft yarn processing machine having a yarn processing unit for processing yarns, feed rollers and yarn storage drums. The start of the yarn storage drums may be controlled in connection with the start of the weft yarn processing machine. The respective operating speeds of the feed rollers of the weft yarn processing machine may be held constant and the yarn storage drums may be operated in synchronism with the corresponding feed rollers respectively at winding speeds slightly higher than the respective feed speeds of the corresponding feed rollers.

Abstract: In a jet loom, a weft insertion start timing, a jet injection start timing of a main weft inserting nozzle and a jet injection stop timing of auxiliary weft inserting nozzles are controlled on the basis of empirical rules. A weft insertion control program incorporating the empirical rules is provided for a control computer for controlling an energization start timing of a solenoid, an energization start timing of an electromagnetic valve and a deenergization timing of an electromagnetic valve on the basis of the weft insertion start timing obtained from a weft release detector and the weft leading end arrival timing obtained from a weft detector.

Abstract: An electronically controlled weft yarn processing unit having a weft yarn feed system arranged separately in the vicinity of a weaving machine. The yarn feed system including at least one yarn feeder having a separate drive motor including an electronic control unit and monitoring and control elements. The yarn feed system further including a first input and indicating section connected to the electronic control unit of the yarn feeder for adjusting at least one functional parameter including a speed limit of the drive motor, a weft yarn length, a sensitivity of the monitoring and control elements, a reference value for a weft yarn store size, and a weft yarn store offset. The weft yarn processing unit also having an operation and control panel provided on a weaving machine. The first input and indicating section is located within the control and operation panel on the weaving machine.

Abstract: A yarn supply system having a plurality of feeders associated with a textile machine. Each feeder having its own speed control system including a variable speed drive motor and a variable speed controller which includes a programmable control unit which is capable of responding to the actual yarn consumption requirements and responding to a main control apparatus message. The main control apparatus including a yarn feed rate anticipating unit that represents additional intelligence to the feeders. The yarn feed rate anticipating unit becomes informed about a weaving pattern stored in the main control apparatus memory and transfers a message via a message transfer network to individual feeder programmable control units to accelerate or decelerate in advance of an actual winding-on requirement.

Abstract: A measuring weft feeder for fluid jet looms which measures the weft yarn lengths being inserted into the loom shed is disclosed. The weft feeder comprises an electric motor for rotating a winding arm, a drum held stationary around which the arm winds up the yarn into even turns, forming a weft yarn reserve whose length is controlled by means of suitable sensors, and a yarn stopping device. The yarn stopping device includes a rod for engaging and stopping the yarn at the outlet of the feeder. The rod is movable between a withdrawn rest position and a projecting yarn stopping position in which its end moves into a cavity formed for such purpose on the drum periphery, close to the free end thereof. The drum cavity has mounted therein a plurality of bristles positioned transversely to the rod of the yarn stopping device, so that the rod may engage the bristles, crossing them at least partially, when assuming its projected position to stop the weft yarn.

Abstract: Elements forming part of a textile machine are controlled and supervised with the aid of a computerized system. This comprises one or more units which serve the element and which together with other units form a network. One or more units can, if necessary, serve more than one element. Each unit is connected to a connection which forms part of the network formed by the units. Message transmission within the system takes place serially and digitally at the connection. The message transmission at the connection includes message types which are ranked from the point of view of priority, and the units and the connection are arranged to discriminate in the message transmission effected so as to guarantee a transmission time, for a finally transmitted message between units concerned, of a maximum of 2.0 ms for at least three different instantaneous signals or trigger signals which are attributable to functions in or on the textile machine.

Abstract: A feeder for supplying a warp to a weaving machine is described. The feeder includes a drum non-rotatably supported by a drum shaft, a driving section connected to the drum shaft, a flyer wrapping warp around the drum, the flyer being supported by and rotatable with the drum shaft, a warp sensor pivotably supported in one of a plurality of slits formed in the drum, at least one supporting member eccentrically movable and slantable with respect to the drum shaft, and at least one carrier born by the at least one supporting member and guided by the plurality of slits respectively to be movable in both an axial direction and in a radial direction. The flyer transport the warp wound about the drum in the axial direction with the supporting member rotatably mounted on the drum shaft. A dial having a cam-like slant surface is attached to the drum shaft so as to enable a inclination angle adjustment of the slant surface. By the adjustment of the dial, the supporting member is inclined.

Abstract: In a measuring weft feeder for fluid jet looms, of the type having a winding unit with adjustable cross section and comprising a cage wall formed of two sets of alternating columns mounted on reciprocally slanting flanges so as to move forward the yarn reserve into separate turns. The sets of columns (preferably divided into evenly spaced groups or sectors) are mounted on the respective flanges by way of structure adopted to adjust their radial position, this structure acting simultaneously and to an equal extent on both sets of columns and being operated by a single control member.