Abstract: This device designed for weaving machines enabling a weft selection, comprises for each prefeed and measurement device (1), an electric drive motor (8) having a controlled angular position, such as a "step" motor. The angular position of the main shaft (14) of the weaving machine, detected by means of a coder wheel (24), is converted into pulses (D) which are supplied by a "switching system" (15) which may be switched from the weft selection control (16) to the electronic power circuit (17) associated with the motor (8) of the prefeed device (1) selected. It is therefore possible to drive the shaft (5) of the selected prefeed device through a predetermined number of rotations synchronously with the rotation of the main shaft (14) of the weaving machine.

Abstract: A rotary drum type weft storage apparatus for a shuttleless weaving machine of the type wherein a weft yarn from a yarn supply source is wound up onto and stored on a rotating yarn storing drum. It comprises a holding drum provided on a yarn releasing side of a yarn storing drum, a ring loosely fitted on an outer periphery of the holding drum, a retaining member for retaining the ring, and a reciprocal driving mechanism for moving the retaining member into and out of engagement with the larger diameter portion of the holding drum.

Abstract: Production of a weft defect on a cloth under weaving is detected by at least two weft detection units arranged side-by-side on a loom along the path of travel of inserted wefts for issuing a defect signal which is then subjected to automatic allocation of a corresponding penalty. Penalty-loaded defect signals are sequentially accumulated at a control counter so that the loom is stopped when a count at the control has exceeded a given threshold. When a defect is removed by manual mending on the loom during a dwell, a corresponding gain is automatically subtracted from the count at the control counter during sequential accumulation in order to subdue the count below the threshold and to allow restarting of the loom. Automatic inspection on the loom can be carried out on a level with conventional manual inspection of the loom.

Abstract: The weaving machine includes an electronic control device which can receive a signal for a reverse-motion of the pile warp let-off drive motor from the card dobby via a sensor when borders (plain woven regions) of the fabric are to be produced within the terrycloth material. When the drive motor briefly runs backward, the tension in the pile warp increases, which causes the plate warp tensioning beam to be shifted into the plain weaving position in which a pivoting lever rides up onto a leaf spring. The latter is shifted into the plain weaving position which causes the increased pile warp tension to be produced. If a terrycloth weaving operation is to be returned to, then the drive motor receives an appropriate signal from the card dobby for a brief fast forward motion of the pile warp beam, which causes a lower pile warp tension to be produced again while the pile warp tensioning beam pivots back into the normal position.

Abstract: The invention relates to mechanisms for uncoupling two rotating elements. The device includes a positive clutch sliding on a rotating drive element and subjected to the action of a return spring, an energy storage spring stronger than the return spring and designed to disengage the positive clutch, a cam connected to the drive element and designed to tension the energy storage spring, a pawl capable of keeping the energy storage spring tensioned, and an electromagnet intended to actuate uncoupling and connected to the pawl so as to release the energy storage spring. The device is applicable to temporary uncoupling of two coaxial rotating elements in particular in weaving looms, in order to uncouple the crankshaft from the loom and its main motor from the dobby shaft and its auxiliary control motor.

Abstract: In a shuttleless air jet loom, a method for preventing a weft yarn having therein a defective portion, such as a too thin or too thick portion falling outside a predetermined range of limits, from being inserted into the shed and therefore woven in the fabric, is disclosed.In normal weaving operation, the weft yarn is monitored by a weft yarn sensor which is provided in the path of the weft yarn passage, and the weaving operation of the loom is interrupted when the sensor provides a signal representing a defective portion in the yarn. The yarn thus having the defect is deflected from its normal passage when it is to be picked into the shed. After the defective weft yarn has been disposed of, the loom is reversed to a shed-opening position where restarting of the weaving operation of the loom may be effected smoothly.

Abstract: In a shuttleless weaving machine wherein the filling yarn is inserted into the shed from both sides by gripper systems provided with clamping devices and advanced into and then retracted from the shed, the filling yarn is transferred by a controlled opening and closing of the clamping devices from one gripper system to the other. An articulated link drive including a second rocker arm pivotally supported at a fixed point in the machine is provided for this purpose. The articulated link drive is driven by a cam and cam follower on a first rocker arm connected to the link drive by a coupling link. One link of the articulated link drive has an extension which controls the clamping devices in the shed. The dimensions of the articulated link drive are such that the coupling curve described by the control extension during the time of the reed beat-up leads to a non-interfering rest position underneath the path of the batten or sley.

Abstract: A heald frame comprises two lateral supports which each have a projecting portion (2) which is received in a recess (3) at the end of a frame stave (4). A wedge (9) is mounted in the frame stave (4) within the recess (3) so that it is closer to the heald-carrying rod. A surface (11) of the wedge (9) is inclined towards the end of the frame stave (4) and cooperates with a correspondingly inclined surface (6) at the lower side of the projecting portion (2). The surfaces are pressed together by means of a clamping screw (8) which presses on the opposite surface of the projecting portion (2). The lateral support (1) is pulled against the frame stave (4) as a result of the engagement of the inclined surfaces of the wedge and projecting portion.

Abstract: A weft picking system of a loom comprises a weft winding-guide arm which wounds a weft yarn around a stationary drum in order to measure a weft length to be required for one pick of the weft yarn. The weft winding-guide arm is driven by a pulse motor whose revolution speed is slowly decreased from a predetermined level toward a stoppage of revolution of the pulse motor so as to measure a predetermined part of a required weft length, while is slowly increased into the predetermined level since the initiation of the pulse motor revolution so as to measure a remainder part of the required weft length, thereby effectively preventing the weft yarn from being cut.

Abstract: The control device contains a deflection roll extending over the entire weaving width of the weaving machine, a tensioning beam pivotable about a support beam and also extending over the entire weaving width as well as a sensing roller arranged therebetween and subject to the action of a spring for sensing a portion of the warp threads of the warp, respectively of each partial warp beam. The tensioning beam is subject to the action of a preloaded torsion-bar spring. In this manner a sensing force arises at the sensing roller which can be increased from a first value to a second value according to the position of the tensioning beam. This permits the realization of increased responsiveness of the control device.

Abstract: In the method the auxiliary nozzles are used individually or in groups to form a pressure wave travelling together with the front end of the weft thread through the weaving shed. Individual auxiliary nozzles or groups of auxiliary nozzles are maintained in a cut-off position for a certain amount of time after the front end of the weft thread has passed, however, are again cut-in, particularly prior to the moment of time at which the weft insertion operation ends, so that a trailing travelling wave is formed. Using such method the air consumption can be maintained at low levels. Particularly when individual auxiliary nozzles are cut-in only for short intervals of time in the trailing travelling wave, a particularly low air consumption can be achieved. By employing a trailing travelling wave, a lower air pressure also can be used for generating the pressure wave travelling with the front end of the weft thread.

Abstract: This weaving machine comprises a device for removing faulty weft threads from the weaving shed or the woven cloth respectively, also if they have already been cut from the yarn supply during the weaving cycle. The device has a reciprocatable mechanical removing member (8) by means of which also fibrous yarn threads may be removed from the beating up line. Furthermore the device comprises a catching element (10) for threads which have already been cut, which element is adapted to clamp and take along the thread.

Abstract: The carpet loom has pile wires extending warpwise with associated pile yarn transfer hooks for positioning preselected pile yarns over the pile wires for forming pile loops. The pile wires are pivotally mounted so as to be restingly positioned on the base fabric being woven to assure obtaining the desired pile height loop and to avoid undue tensions and stresses in the fabric being woven to assure smooth efficient loom operation. The transfer hooks extend rearwardly with their hook portions positioned substantially in a horizontal plane and inclined downwardly at an acute angle from the horizontal plane. This positional arrangement of the transfer hooks and the associated mechanism for imparting a reciprocatory movement to the transfer hooks permits an uninterrupted reciprocation of the reed to take place as well as the changing of the pile yarn and ground warp shed. This results in a high speed of loom operation of about twice the rate of prior carpet looms.

Abstract: It comprises a grid incorporating inclined bars (13) for bending the needles (5) so that they pass above a lateral lug (8c) of the corresponding small needle (8) provided to be flat. Each small needle comprises a fine tail (8b) guided by a perforated panel (12) on which it rests in the free state by being loaded by the needle (5) which passes through a perforation (11a) in a plate (11). The paper (9) is raised in the direction of the small needles with a view to selection.