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: Method for optimizing a textile production process, which consists in manufacturing a fabric (11) on a weaving machine (1), characterized in that characteristics of the fabric (11) and/or fabric-determining elements are visualized on a machine screen by means of at least one image.

Abstract: A thread clamp for a weaving machine includes a clamp having at least two clamping parts between which a thread may be clamped and an actuator arranged to move the clamping parts between clamping and unclamped positions. The actuator is arranged to operate the clamp so that it moves at least in one direction by a negative fluid pressure. The actuator may be formed as a small piston that may be actuated both by positive pressure and negative pressure to move the clamp between clamping and unclamped positions.

Abstract: A device for inserting weft threads in an airjet weaving machine including at least one main blower and a respective thread clamp associated with the main blower. The thread clamp is constituted of an element configured in a modular form. Such modular form enables several such elements to be assembled in a modular configuration, including one on top of another. Pneumatically actuated elements are used to engage and disengage the thread clamps whereby the thread clamps may be engaged or disengaged by pressure and vacuum supplied through a single supply conduit. A method for inserting weft threads in the shed of an airjet weaving machine includes holding each weft thread at least temporarily in a thread clamp that moves with the sley of the weaving machine and using a thread tensioner outside the shed at a location between the thread supply and the thread clamp.

Abstract: A device for forming a shed in weaving machines includes a harness and coupling elements for coupling the harness to a drive mechanism. The height of the harnesses is made adjustable by mounting respective coupling elements on setting screws integrated into the side beams of the harness elements and movable relative to the side beams for enabling individual height adjustment of each harness element relative to its coupling element. Because the height adjustment is done on the harness itself, the height adjustment can be done when the harness is inside as well as outside the weaving machine. The setting screws extend through the side beams to the coupling elements, which are situated below the harness, adjustment being effected by turning the screws from the top of the side beams to move of the harness up and down relative to the ends of the setting screws and coupling elements coupled thereto at the bottom of the side beams.

Abstract: A weaving method makes use of a set of weaving frames arranged such that, in each weaving cycle, some of the weaving frames are held in an identical extreme position, while all remaining weaving frames are moved in order to provide different tensions for the top and bottom warp threads at the moment of beating up. The shed is formed so that at the moment of crossing, as the weaving frames change position, the length of the course followed by the crossing warp threads is equal or almost equal to the length of the course followed by the warp threads held in the extreme position.

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

Abstract: A method for isolating a yarn end of a broken warp thread from the warp in a weaving machine, the weaving machine being provided with a warp stop motion of the type wherein drop wires have been hung up on the warp threads for detecting that a warp thread has broken, includes the steps of first putting a yarn end of the broken warp thread in a correct position relative to the warp and subsequently removing the warp end from the warp. An apparatus for carrying out the method includes a clamp located on one side of the stop motion, a carrying element for tensioning the thread by hooking it and carrying it between the drop wires in a direction transverse to the warp direction, and a device located on a second side of the stop motion for removing the thread.

Abstract: A device for attaching an element in a frame includes a seating, a supply path via which the element to be attached is brought to the seating, and a pivotable member. In a first position of the pivotable member, a first end thereof is situated in the supply path. In a second position, the first end is situated outside the supply path and a second end of the pivotable member to move the pivotable member between its first and second positions. The first position of the pivotable element is an overcenter position in which the relative positions of the pivotable member's pivot point, the seated element, and the point of contact between the seated element and the first end of the pivotable member are arranged to retain the seated element in place within the seating. In the second position of the pivotable member, the transport device moves the element via the supply path into and out of position in the seating.

Abstract: The rapier guide of a gripper weaving machine includes at least two series of guide elements for guiding the rapiers in the shed. The two series are presented in the shed at the backmost position of the sley to guide the rapiers on both sides thereof. In the series of guide elements which is situated closest to the reed, those guide elements situated nearest the ends of the shed are arranged to also be situated, in all positions of the sley, essentially underneath the plane formed by the undersides of the rapiers.

Abstract: A method and a device for replacing a cloth beam in a weaving machine utilize the steps of removing a cloth beam from a winding device, pressing an empty cloth beam against a fabric and against a guide piece such that the fabric is turned over the guide piece, subsequently releasing the fabric, and driving the empty cloth beam such that the fabric is wound thereon, and finally mounting the empty cloth beam in the winding device.

Abstract: A device for retrieving the end of yarn wound on a yarn-feed spool includes a system for blowing an essentially tangentially directed current of air over a rotating yarn-feed spool so that an end of the yarn wound on the yarn-feed spool can be freed from the spool. A suction nozzle is provided to capture and draw into the nozzle the end of the yarn blown free from the spool. A movable carriage system carrying at least the air current generating means and the suction nozzle is provided so that a yarn-feed spool can be approached, exposed to the air current and the freed yarn end captured by the suction nozzle. The mobile system may also carry a device for engaging the driving the yarn-feed spool in rotation. A conveyor system for moving the retrieving system over a weaving machine is also described.

Abstract: A device for supplying weft threads in a weaving machine includes a bobbin support over which it is possible to slip a bobbin, a thread guide duct extending axially through the bobbin support and which includes an opening at the top for permitting entry of a yarn end into the thread guide duct, a blower for providing an airstram in the thread guide duct, the airstream flowing towards the top of the bobbin support, a prewinder, and a suction and blower device mounted at an entry of the prewinder. The blower and the suction and blower device are simultaneously switched on to create an airstream between the thread guide duct and the prewinder to carry the yarn end situated in the thread guide duct to the prewinder.

Abstract: A weaving machine including a device for stretching a fabric in the weaving machine includes a guide bar over which the fabric is bent to thereby bring a surface of the fabric into contact with the guide bar. An array of notches on each end of the guide bar is provided to exert an outward traction on the fabric edges to maintain the fabric in stretched condition. To enable a fabric whose width is narrower than a full weaving width to be located along the guide bar in a non-symmetrical manner while effecting a lateral traction force on the edges of the fabric; the guide bar is provided with at least one array of notches located at one end of the bar arranged so that each notch in the array is broken so as to extend circumferentially less than the full circumference of the guide bar, with the array including a plurality of notches longitudinally and circumferentially spaced along the guide bar.

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

Abstract: A method for supplying weft threads into the shed of a weaving machine includes the step of controlling at least one of the weaving machine elements which can influence weft insertion times as a function of the reopening of the shed. The method is particularly applicable to weaving machines of the type in which weft threads are inserted by a transport fluid. A device for carrying out the above method includes a computing unit and memory which controls an insertion time influencing element in response to signals related to a moving pattern of the harnesses and information regarding the weft pattern.

Abstract: When a weft thread is not used for weaving for a certain preset time, at least one weft length of this weft thread is automatically inserted into the shed and removed to prevent weaving errors caused because the weft thread is held too long in the insertion nozzle and consequently may be damaged. The weaving process then continues with a new length of new weft thread.

Abstract: A weaving machine of the type in which a main shaft is braked by an electromagnetic brake has, in addition to the brake, a lock for locking the main shaft against rotation. The lock includes a locking element which meshes into gear teeth of a wheel coupled to the main shaft. The lock is automatically activated when power to the weaving machine fails, and may be deactivated by turning a hand wheel.