Abstract: A loom restarting method restarts a loom stopped due to a loom stopping cause without entailing a “wavy set mark”. When a loom is stopped due to a loom stopping cause entailing faulty picking, the loom restarting method provides a loom stopping command, withholds the loom from a picking operation during a braking period for braking the loom to stop the same in a weaving cycle subsequent to a weaving cycle in which the loom stopping cause occurred, reverses the loom to the weaving cycle in which faulty picking occurred, removes a weft yarn picked by faulty picking, and restarts the loom to resume a normal weaving operation. The main shaft of the loom is positioned, after removing the weft yarn picked by faulty picking, at an angular position at which a picking operation is possible in the weaving cycle in which the weft yarn picked by faulty picking was removed and the reed of the loom is not in contact with a weft yarn inserted in the cloth fell of a fabric on the loom, and then the loom is restarted.

Abstract: An apparatus at a weaving machine serves for the protection of persons in danger regions which extend about a beat-up edge along a weaving width and beyond the latter. In this apparatus, monitoring means which emit and register light beams are arranged about the danger regions. Signals which arise as a result of an encroachment into the danger regions and through which an operating stop of the weaving machine can be triggered can be produced in the monitoring means by means of the light beams. First monitoring means are associated with a more comprehensive region and second monitoring means are associated with a central region, the actual danger region. During a normal operation of the weaving machine the first monitoring means are in an active state which ensures the protection. An activation of the second monitoring means is provided for use during activities which are occasionally to be carried out at the weaving machine within the more comprehensive region.

Abstract: The apparatus at a weaving machine (3) serves for the protection of persons in danger regions which extend about a beat-up edge (34) along a weaving width and beyond the latter. In this apparatus, monitoring means (1) which emit and register light beams (12) are arranged about the danger regions. Signals which arise as a result of an encroachment into the danger regions and through which an operating stop of the weaving machine can be triggered can be produced in the monitoring means by means of the light beams (12). First monitoring means (1) are associated with a more comprehensive region and second monitoring means (2) are associated with a central region, the actual danger region. During a normal operation of the weaving machine the first monitoring means are in an active state which ensures the protection. An activation of the second monitoring means is provided for use during activities which are occasionally to be carried out at the weaving machine within the more comprehensive region.

Abstract: A fluid jet loom includes a source of pressurized fluid, a magnetic valve, and at least one nozzle, such as a weft insertion air jet nozzle, as well as at least one flexible pressure hose connecting and providing pressurized fluid from the magnetic valve to the nozzle. In order to detect any hole, rupture or separation of the pressure hose, the hose includes at least one electrical conductor embedded in or arranged on the hose wall. An electrical current flows through the electrical conductor, which preferably forms a conductor loop and especially a resonant circuit loop. By monitoring an electrical characteristic, such as the resonant frequency, of the electrical signal received from the conductor loop, any disruption in the pressure hose can be immediately detected as a change in the monitored electrical characteristic, which in turn causes a loom stop signal to be generated.

Abstract: The position of the fell of a cloth being woven on a weaving machine is sensed with a sensor needle that can be moved into and out of the cloth at a location proximate the fell during interruption of the weaving operation. Upon insertion of the sensor needle into the cloth, it moves with the cloth and therewith measures cloth displacement while the weaving machine is at rest. The sensor needle is attached to an actuation device capable of reciprocating the needle into and out of the cloth. The sensor needle is inductively coupled to a distance sensor which measures the needle displacement and therewith the displacement of the fell. In this manner, fell displacements caused, for example, by such factors as the relaxation of the run of cloth or of the warp yarn while the weaving machine is at rest can be measured and, before weaving is restarted, the position of the cloth, and therewith of the fell, can be corrected.

Abstract: A loom for fabrics which are sensitive to loom stopping marks, especially twill fabrics, has a disengagement lever (14) on an eccentric drive mechanism of the loom. The disengagement lever is operated by a controlled driving device, so that it causes all heald frames or shafts of the loom to assume a central shed position when the loom is stopped. Thus, stoppage marks in the fabric are avoided since the heald frames no longer stretch the warp threads during a loom stoppage since the frames are moved to a closed shed position during stoppage.

Abstract: A method of controlling an operating speed of the loom for increasing the production rate by varying the present operating speed so as to be increased includes a step of estimating a stop rate at the final point of time during a predetermined period at a certain time during the predetermined period, and comparing the estimated stop rate with a predetermined limit stop rate, and setting the present operating speed to increase it when the estimated stop rate is less than the limit stop rate and to decrease it when the estimated stop rate exceeds the limit stop rate.

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.

Abstract: A weaving installation includes a weaving machine and a dobby which can be driven by the weaving machine. In order for the weaving machine to drive the dobby, the weaving machine may be provided with a pulse generator for the transmission of pulses to a control unit which, in turn, regulates a motor coupled to the dobby. Alternatively, the camshaft of the weaving machine may be provided with an extension which is directly connected to the dobby. The dobby may also be driven independently of the weaving machine. In the case where the weaving machine has a pulse generator which controls a motor coupled to the dobby, this is accomplished in that the motor is operable even in the absence of pulses from the pulse generator. In the case where the camshaft of the weaving machine has an extension which is directly connected to the dobby, the dobby can be driven independently by a planetary gear on the extension.

Abstract: A method for monitoring warp thread breaks on weaving machines includes the steps of locating broken warp threads and storing the number of broken warp threads in a memory as a function of the postions of the breaks.

Abstract: Method for detecting the presence or absence of warp threads clinging together, with the characteristic that it consists principally of a combination of: initiating a machine stop when a warp stop signal is received indicating that a contact has been made by a drop wire 9; checking for a fallen drop wire 9A; and, if no fallen drop wire is found, restarting the machine at least once and interpreting a warp stop motion generated upon restart as an indication that the warp threads 2 are clinging together.

Abstract: A yarn monitoring device comprises in association with each doubling spindle (1) a sensing arm (7) monitoring the upwardly directed yarn run between yarn guide eye (3) and feed roller (V), which arm is mounted by means of a mounting bush (9) for limited swinging on a rocker shaft (6). The mounting bush (9) comprises a slot (12) extending in its circumferential direction, in which engages a stop pin (11) extending radial to the rocker shaft (6) and fixed relative thereto. In the slot (12) is a lining in the form of a substantially U-shaped clip (13) of spring steel, whose semi-circular connecting part (13b) lies at the end surface (12b) of the slot (12) directed away from the spindle and whose U-arms (13a) extend parallel to the side walls (12a) of the slot (12), abut thereagainst and are inwardly bent at their free ends (13c) so that they grip on to the stop pin (11) in the swung up position of the sensing arm (7).

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 method of controlling a weaving machine which includes a shedding device with yarn guiding eyelets, an electronic control device for the shedding device, a warp let-off device and a fabric take-off device, the electronic control device having a program memory providing a weaving program with weaving program steps and an auxiliary program, comprises stopping the weaving machine in a shed by means of a stop signal, switching by means of the auxiliary program to inverse weaving the shedding device and the weaving program step of the shed in which the weaving machine has stopped, returning by means of the auxiliary program the weaving machine to the next preceding shedding crossing point, stopping by means of the auxiliary program the weaving machine in this next preceding shedding crossing point so that the yarn-guiding eyelets are placed in a middle position, switching by means of the auxiliary program the weaving machine from inverse weaving to normal weaving according to the weaving program, and restarting

Abstract: The safeguard device has a light beam emitter secured to a pivotal lever for movement between an operative position and a retracted position. In addition, a plate is pivotally mounted relative to the lever to move with the lever. The plate is formed with a recess to expose the light beam when the lever is in an operative position and is otherwise shaped to mask the emitter when the lever is pivoted into a retracted position. Masking of the light beam serves to signal a need for interrupting the operation of the weaving machine.

Abstract: A faulty picking diagnosing system for a fluid jet loom equipped with a fluid jet picking device. The faulty picking diagnosing system is capable of diagnosing a faulty picking cycle while the loom is in operation, to specify the causative parts of the faulty picking cycle among the functional parts of the loom, through the detection of acutal weft yarn unwinding times when coils of the weft yarn stored on the measuring and storing drum of the loom are unwound, respectively, and actual weft yarn arrival times when the free end of the picked weft yarn arrives at predetermined detecting positions, respectively, and comparing the detected data with the corresponding target values.

Abstract: The cross beam of the loom is provided with a retaining bar in which at least one panel-like or board-like switching unit is slidably mounted. Suitable acess openings are provided in the retaining bar to permit access to the control elements on the switching unit. Panel like spacing elements are employed to locate the respective switching units within the retaining bar and electrical plugs are provided for connecting the switching units to a flat cable extending along the cross beam.

Abstract: Optical scanning and inspection of loomed fabric on one or more looms is carried out using a travelling optical scanner that scans an inspection area of fabric on a loom faster than the fabric traverses the inspection area, such inspection area provided between the weaving portion of the loom and the fabric take-up roll. The scanner generates signals that can routinely be compared with preset reference standards and which can be used to control the stopping of the loom upon the detection of a weaving defect. Fabric moving through multiple looms can be scanned in sequence by a scanner traversing multiple inspection areas of the looms.

Abstract: A weaving machine having a filling breakage detector for generating an error signal upon breakage of a filling thread. This error signal then stops the weaving machine. A pick finding process is then initiated in which the weaving program is set back and then blocked. After removal of any filling thread in the open shed, the weaving machine is operated until the preceding shed is opened enabling the removal of the filling thread. If this is the ruptured filling thread, it is replaced by a new filling thread, the weaving program is unblocked and the weaving machine is operated in its normal sequence. If the filling thread is not ruptured once or if another ruptured filling thread is detected in a preceding shed, the pick finding process is repeated. The cloth takeoff and the warp letoff are also set back correspondingly with the weaving program.

Abstract: Practice of an auto-repair operation on a loom is automatically prohibited when the frequency of auto-repair operation exceeds a preselected rate in order to avoid production of off-grade cloths otherwise caused by continuously repeated formation of weaving defects.

Abstract: The brake is provided with a resilient member between the brake band and a brake lever. In addition, the resilient member is provided with recesses in the form of bores in a part of a resilient member subject to compression. The construction of the resilient member is such that the recesses render the resilient member capable of damping high stresses.

Abstract: According to the present invention, the respective fluid pressures at the output sides of the plural jet fluid valve units in a fluid jet loom are converted into electrical signals by respective pressure detection elements such as piezo-electric elements. An alarm lamp or buzzer is activated or the loom operation stopped unless all of the electrical signals supplied from the pressure detection elements associated with the valve units reach preset values.

Abstract: A weaving machine is combined with a stop control means. A warp feeler, a weft feeler or a manual stop switch produces a stop signal and sends it to the control means. A comparator compares a crank angle sensed by a crank angle sensor with a preset angle supplied by a preset angle supplier, and produces a position signal at the preset angle. If the control means receives the stop signal during a normal weaving operation, then the control means stops the weaving machines immediately regardless of the crank angle by sending an output signal to a brake system of the weaving machine. After that, the control means starts the weaving machine moving at a slow speed, and stops this slow speed movement when the comparator produces the position signal at the preset angle.

Abstract: A method of stopping a loom, whose operation is controlled by a microcomputer, at a predetermined position thereof is disclosed herein. In view of the phenomenon that the load on loom operation is varied with the operating cycles thereof depending on the texture of fabric to be woven, but the variation takes place in repeated cycles of similar patterns each including different phases in succession of a known number, the method according to the invention comprises the steps of detecting the deviation of the actual stop position from the predetermined position resulting from the preceding loom braking operation, executing arithmetic operation on data regarding said deviation for compensation thereby to adjust the position at which brake is to be applied in the current braking operation, and applying brake when said position determined through said arithmetic operation is reached by the loom, wherein such steps are carried out in each group of the phases that correspond to each other in similarity.

Abstract: In order to prevent a loom from continuing to operate after burnout of hot wire cutters for cutting selvage, circuitry is provided to automatically stop operation of the loom upon hot wire cutter burnout. The circuitry preferably includes a conventional loom-stopping device associated with drop wires (for detecting warp end breakage) already associated with the loom. A coil is disposed in series with the hot wire cutters and operatively associated with a reed switch and an indicator light which are connected in parallel with the drop wires. The coil, reed switch, and indicator light can be readily retrofit to pre-existing loom components, and the indicator light allows the operator to determine whether loom stoppage is a result of hot wire cutter burnout, or warp end breakage.

Abstract: A method positioning control is disclosed, to stop mechanisms of a loom at predetermined positions when stopping the loom operation, in which the loom is directly controlled by a microcomputer. In the method, correction is made with respect to a predetermined position for commencing a braking operation so as to stop the mechanisms at said positions correctly. The above-mentioned correction is conducted by, first, obtaining the positional deviation between the actual stop position and the predetermined stop position during the last braking operation, second, using the obtained positional deviation for effecting identical correction regarding the next braking operation, etc. repeated over and over.

Abstract: For ideal stoppage of loom rotation at a constant crank angle, initiation of braking action on loom rotation is always automatically and properly timed on the basis of initial stop lag angle representative of the current braking function so that the resultant actual stop angle should match the preselected stop crank angle and, more preferably, the initial stop lag angle is renewed to cover gradual deterioration in the braking function.

Abstract: The invention relates to the textile industry and more particularly to looms. The device comprises a motor-reducing gear unit which can drive the dobby mechanism selectively, through a clutch, this mechanism being normally driven, from the main shaft of the loom by a pulley. A keying system enables the pulley to be made fast to or released from the shaft. The unit can, either drive the dobby mechanism alone for shedding motion searching, or drive the loom and the dobby mechanism for the slow speed operation of the loom. The invention overcomes the drawbacks of pulsed slow speed operation.

Abstract: A weaving machine is operationally connected to a shed-forming machine which includes a drive shaft and a braking mechanism. The latter includes a braking disk which is axially slidably supported on the drive shaft of the shed-forming machine. The braking disk can, during movement thereof, come into frictional engagement with a stationary counterpart. In an alternative embodiment, a modified pick-finding device is used as a brake. In the case of a halt of the weaving machine which is to be carried out quickly, for example during a thread break, the braking mechanism of the shed-forming machine is actuated to relieve the braking mechanism of the weaving machine, and thus no great braking action need be transmitted through the drive for the shed-forming machine.

Abstract: The cam shaft of a fluid jet loom, which cam shaft normally operates the warp yarn harness frames, is disengaged from the machine drive mechanism by a clutch mechanism. The cam shaft is then rotated manually by the operator, as the machine drive is by-passed, to reposition the harness frames at a proper position such that faulty picks can be easily removed.

Abstract: The invention relates to improvements in mechanisms for driving regulators of weaving looms. Between the shaft of the dobby and the chain pinion which drives the regulator of the loom there is interposed a differential reverser whose satellites are borne by a race axially moveable coil. The latter is moveable through the unweaving circuit so that the reverser is automatically actuated during unweaving and causes the regulator and the woven fabric to move backwards while the dobby continues to rotate in the same direction (electronic program).

Abstract: The present invention relates to improvements in shed locating devices associated with dobbies and other weaving systems. A device is provided to enable the dobby shaft to remain coupled to the loom shaft whilst being connected to an auxiliary motor and gear reducer for providing low-speed drive of the loom and the dobby for use when working on the weaving system. The same motor and gear reducer are also used during shed locating operations. The mechanisms for shifting between the normal operation of the loom and dobby, the shed locating operation, and the low speed drive of the loom and dobby are electrically controlled.

Abstract: The pick-finding device has a planetary transmission for turning back the weaving units into their proper operative position relative to the weaving machine. The input shaft and output shaft of the transmission run in the same direction and at the same speed as one another. In addition, an indexing means is provided to supervise the range of adjustment of the control motors in accordance with the required range of adjustment of the weaving units.

Abstract: In a pick finder, a gear which is driven by a motor sits on a sleeve, which has thereon a tooth of a single-tooth coupling. For tensioning the return spring which effects engagement of the coupling, the gear has on the front side an annular control cam surface with recesses and cams, and rigid rollers can be brought into contact therewith through axial movement thereof with respect to the shaft. Based on the size and the placement of the respective rollers, engagement thereof with the cam surface on the gear rotated by the drive motor of the pick finder will move the sleeve into a position for pick finding or for slow-speed run of the weaving machine with the shed-forming machine. At the same time, the return spring is tensioned by the force of the motor.

Abstract: A control apparatus for the electromagnetic brake of a brake device or unit of a weaving machine or loom comprises a cam-controlled brake-pulse transmitter rotating with the machine shaft and two continuous signal switching stages which act upon two parallel connected AND-gates or circuits, each having connected thereafter an adjustable or regulatable time-delay element. The latter jointly cooperate with an OR-gate or circuit which delivers a related stop signal to the brake device or unit. In this way it is possible to achieve a simple, precise and reliable regulation of the angular position of the crank, so that the regulatable time-delay between the output pulse of the AND-gate and the output pulse of the time-delay element constitutes a measure for the corresponding angular position of the crank.

Abstract: A method and an apparatus for controlling operation of at least one operating element of a loom on the basis of a reference signal are disclosed. A rotational position signal developed during each weaving cycle of the loom is compared with the reference signal to issue a rotational angle signal indicating an angle through which the loom has been rotated with respect to a reference angular position. By utilizing this rotational angle signal, the timing of the operation of any operating element can be determined.

Abstract: A monitoring system for a fluid weft insertion loom monitors the significant operative events of each weaving cycle of the loom, e.g. yarn supply withdrawal, insertion nozzle actuation and yarn end arrival, and indicates the occurrence of each such event, preferably in terms of the elapsed time of such occurrence from a fixed reference point of the loom cycle, for example front dead center. The indications of the relative timing of the occurrences of such events is preferably retained on corresponding visual displays until the successful completion of each weaving cycle or in the event of a defective cycle until the defect is corrected and the loom is restarted. Preferred individual sensing units for the respective significant operative events are also disclosed.

Abstract: Disclosed is a method of sensing an abnormality in a weft detecting device which is employed in a loom in order to detect whether a weft is present in a predetermined interval corresponding to a set crank angle range within one revolution of the crank. When the weft detecting device generates a signal in the predetermined crank angle range excluding the weft detection angle range, the signal is regarded as an abnormal signal. The abnormal signal is processed by circuitry to detect the abnormality in the weft detecting device. Thus, when it is impossible to detect a weft insertion error because of some abnormality in the weft detecting device, the presence of the abnormal signal is utilized to issue an alarm or to stop the operation of the loom.

Abstract: A system for controlling the stopping sequence of a plurality of weaving machines under emergency conditions and a method for the same are disclosed. The system includes a preference control circuit which upon receipt of high and low priority emergency signals from detectors activates a brake actuator to stop the associated weaving machine under the emergency condition of high priority which calls for immediate action, while introducing a delay to the corrective action to be taken in respect of the weaving machine under the emergency condition of low priority not requiring immediate action.

Abstract: Apparatus for monitoring one or more electric signals representing movement of objects such as threads, strips, or the like during one or more surveillance time periods. A first signal detector detects the electrical signals representative of the movement. A trigger-signal-generating circuit generates a trigger signal upon detection of an electrical signal of at least a predetermined magnitude. A second signal detector is responsive to trigger signals to activate a surveillance circuit which indicates detection of a moving object. The apparatus includes a device for increasing the sensitivity of one or both of the signal detectors during all or part of the surveillance period.

Abstract: A drive, control, and monitoring device for looms in which there is a drive motor connected to the power line, a flywheel operatively connected with the drive motor, an electromagnetic brake and clutch unit arranged between the flywheel and the crankshaft of the loom, and a means for controlling and monitoring the weaving process.

Abstract: Operation of a weaving loom is stopped when tension in warp yarn less than a reference value at beat-up is successively sensed at a plurality of successive beat-ups.

Abstract: A device to detect the tension uniformity of a belt in a weft inserting member of a shuttleless loom wherein a belt anchored at its ends to fixed contiguous points and guided by rollers on a movable carriage with reciprocating motion serves to to control a gripper for laying down weft threads. The device comprises a cylindrical anchoring body on which an end of the belt is partly wound, there being interposed between the anchoring body and the belt section an elastic member mounted on the anchoring body and urged by the belt section against the body by the tension in the belt. Upon slackening of the belt, the elastic member displaces the belt section to produce closure of a switch which detects the reduction in the belt tension.

Abstract: The present invention relates to equipment for monitoring the yarn travel on a textile machine, particularly in the shuttle of a weaving loom, comprising a piezoelectrical yarn sensing unit mounted in the shuttle and an electronic receiving circuitry outside the shuttle. The sensing unit transmits yarn travel signals of a frequency which is determined by one of the natural frequencies of the sensing unit, and the electronic receiving circuitry comprises at least one resonant circuit tuned to that natural frequency.

Abstract: In a triaxial weaving machine heddles arranged in opposing rows are shifted in opposite weftwise direction with the leading heddle in each row being transferred to the trailing position in the opposite row. This invention provides means for stopping the weaving process if a heddle being transferred is not, at the end of the transfer operation, aligned with a slot to guide the heddle during a heddle shedding operation.

Abstract: An automatic control apparatus for a weaving machine is disclosed, which includes a photoelectric detecting scheme provided at a reed of the machine such that a light beam thereof penetrates the shed of the warp sheet and detects improperly shedded warp. A timing switch is coupled to a crank shaft for generating a timing signal at a predetermined angle of the crank shaft, and delay circuits are provided for delaying the timing signal so as to generate a gate control signal. The leading and/or trailing edges of the gate control signal are defined by the delay circuits and a gate circuit is included which is responsive to the gate control signal for allowing the warp detected signal to be gated. A wave shaping circuit receives the warp detected signal as gated and provides wave shaped signals thereof. A charge storing capacitor is connected to receive wave shaped signal, said the charge voltage thereof is threshold detected to provide a control signal.

Abstract: Device for recording weaving faults in fabric being manufactured on weaving machines in which a recording card is fixed to a drum means and has associated therewith writing means that are initiated through an electro-magnet and circuitry connected to at least one stop motion on the stop circuit of the weaving machine.The drum which supports the recording card is rotated at the same speed as the advancing fabric being manufactured on the weaving machine through a transmission coupling the drum to means on the weaving machine such as the withdrawal cylinder.

Abstract: A sensing lever, preferably a double-arm lever, is journalled over a fulcrum; one arm is engaged by the thread to be supervised, and further connected to operate an electrical switch; the other arm is subject to electromagnetic force derived from an interrupted, pulsed electromagnet. Pulsed operation of the electromagnet can be obtained by a signal derived from the switch of the lever itself, or from an extraneous source; upon attraction by the magnet, the contacts are opened; during a pulse gap, the thread tension depresses the lever, thus closing the contacts; the lever will, therefore, continuously vibrate and presence of an a-c signal across the switches will be indicative of: (a) presence of thread; (b) thread tension below a predetermined limit (excessive tension would overcome the pulsed reset force of the electromagnet); and (c) proper operation (jamming of the lever would likewise result in a d-c output from the switch).