Abstract: A weaving machine has a first drive means which has a speed change transmission and drives a warp beam during normal weaving operation, and a second drive means for driving the warp beam independently of the first drive means when the weaving machine is moved by inching or by hand during downtime operation. A first sensor senses the weaving cycle of the weaving machine, and a second sensor senses the warp beam rotation. A warp beam rotation control system determines the angular displacement of the warp beam per weaving cycle during normal weaving operation, and controls the warp beam rotation during downtime operation in accordance with the determined angular displacement per weaving cycle.

Abstract: A loom having a means for automatically unweaving the weft upon the occurrence of a weaving fault, thereby reducing the labor needed to overcome such weaving fault and thus increasing the efficiency of the loom. The apparatus includes a device for the selective prevention of the weft from entering the shed of the loom, said device being mounted on the loom between the weft supply and the weft-entering end of the shed. The invention may be applied to looms wherein measured lengths of weft are inserted mechanically into the shed, or to jet looms, wherein measured lengths of weft are inserted by jets of inserting fluid such as air or water into the shed of the loom.

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 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 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 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: The two-phase gripper loom or weaving machine comprises two loom units arranged adjacent one another. Each of their heald frames can be actuated by a heald frame positioning device with a phase shift of 180 angular degrees. Each heald frame positioning device is associated with a related one of the loom units. There is arranged between the common main shaft of the machine and the two rotary shafts of the two heald frame positioning devices a clutch drive for selectively individually connecting or coupling one or the other rotary shaft with the main shaft of the machine or with an auxiliary drive. This enables, during standstill of the machine, to bring the open weaving shed of one or the other loom unit into a closed shed position until the gripper loom is restarted, prior to which restarting the closed weaving shed is brought back again into the open shed position.

Abstract: The weft insertion nozzle is mounted on an extension of the sley sole, and the nozzle is pivotable about an axis perpendicular to the sley sole. The nozzle is connected to a fixed point of the loom by means of a retractable connecting-rod. Due to the action of this connecting-rod, the nozzle is in a position parallel to the sley sole during insertion of a pick of weft into the shed, but forms an angle with sley sole in the beating-up position of the sley, at which the weft is cut by scissors. A pneumatic jack supported by the sley sole can also cause the weft insertion nozzle to pivot by retracting the connecting-rod, in order to deflect the weft by directing the weft from the nozzle into a suction mouthpiece so as to prevent insertion of a pick into the shed when a fault is detected causing the stoppage of the machine.

Abstract: A pick-finding mechanism is arranged between a weaving machine and a shed-forming machine. A sleeve of a gear sits rotatably on a shaft, which gear is driven by the weaving machine. A single-tooth coupling can transmit forces from the gear to a sliding sleeve which is secured by a key to the shaft and can be moved axially of the shaft by a switch lever. The shaft can be driven through a multiple-tooth coupling by a motor and a drive gear. The switch lever serves to couple and uncouple the couplings.To find the pick, the single-tooth coupling is disengaged and the multi-tooth coupling is engaged. The weaving machine and dobby can be driven together in phase and in both directions by the motor at slow speed, by simultaneously engaging both couplings. This slow or creeping speed permits observation of the functioning and stopping of the machines in any desired position at any time.

Abstract: A shuttleless weaving machine has a shedding mechanism, a weft conveyor for launching a weft thread through a weaving shed provided by the shedding mechanism, and a plural weft preparation device for delivering weft threads according to a repeating pattern to the weft conveyor. There is a disconnectable coupling between the plural weft preparation device and the shedding mechanism. An angular position comparator includes a part coupled to the shedding mechanism and a part coupled to the plural weft preparation device, said parts assuming a marked angular position relative to each other during normal operation while rotating through 1/(an) revolution per weaving cycle (a=number of wefts after which the weft pattern is repeated, and n=number of marked angular positions). Means are provided for detecting such marked relative angular position of the two parts, which means operate, while such position is not detected, to disconnect said coupling.

Abstract: A weaving machine that is used in conjunction with a lever-controlled dobby head, e.g. a Ruti L-5000 with a Staubli dobby head, is provided with an apparatus-coordinating control system for eliminating fabric defects caused by the following operator errors:a. Running loom with dobby lever in reverse,b. Forward jogging loom with dobby lever in reverse,c. Reverse jogging loom with dobby lever in run,d. Leaving dobby lever in any position other than the run and reverse positions.

Abstract: An apparatus for controlling a dobby in which reading needles read a punch card and each needle influences the movement of a respective heddle frame. Two outer disks having annular toothed portions arranged on the axial facing sides thereof which face one another are secured on the shaft of a punch card drive cylinder. The teeth of the toothed portions are angularly offset by one-half the tooth pitch. Between the two outer disks, and freely rotatably supported on the shaft is a central disk with annular toothed portions on the axially facing sides thereof which are also offset by one-half the tooth pitch. A movable guide member for the reading needles is secured on and driven reciprocally by the central disk. Upon indexing the pattern card for one pick, the toothed portion of one outer disk moves the central disk toward the second outer disk and effects engagement of the facing toothed portions on the central disk and the second outer disk.

Abstract: An apparatus for stopping and resetting a loom. The technical problem which lies at the foundation of the present invention is to provide an apparatus for stopping and resetting a loom to a certain position before a weft stroke which has given an indication of breakage. This technical problem is solved according to the present invention in that a weft fork which senses the weft, and, in the event of a predetermined breakage type in the movement of the weft during a sensing period emits a signal for stopping the loom, is arranged to prevent gripping of a new weft after the generation of a breakage signal, whereby the rapier or rapiers execute one or more strokes without a weft.

Abstract: A shed locating device, interposed between a dobby and the shed forming of a mechanism corresponding weaving loom, of the type comprising an auxiliary motor associated with a dog clutch mechanism for coupling the shaft of said motor to the shaft of the mechanism after disconnection of the mechanism shaft from the shaft of the loom, which dog clutch mechanism comprises a sliding collar member coupled rotationally to the shaft of the mechanism and provided with two series of dog clutch teeth adapted to cooperate selectively with one or the other of two corresponding plates respectively fixed in rotation with the shaft of the loom and with the shaft of the auxiliary motor, wherein the two series of dog clutch teeth of the sliding collar member are provided on two separate ring pieces capable of moving in the axial direction independently of one another against resilient spring return means.

Abstract: There is disclosed a control mechanism for the sand rollers of looms. The output of the cloth take-up motion of a loom is drivingly connected to a first input shaft of a differential gearing mechanism, and the second input shaft of the differential gearing mechanism is drivingly connected to the output shaft of an electric motor. The electric motor is under the control of a mechanism which selectively permits its starting and stopping. The output shaft of the differential gearing mechanism is drivingly connected to the sand roller. The electric motor is preferably of the reversible type, the means for controlling the motor then including means for selectively reversing the motor. During the ordinary operation of the loom, the sand roller is driven by the cloth take-up motion through the differential mechanism, the electric motor being then switched off and locked.

Abstract: The invention refers to a brake for the main shaft of a loom in which in the transmission of the energy between the driving motor and the main shaft a disconnectable friction coupling controlled by supervisory members for the weaving process is interposed, which has a slidable pressure-piece which in one extreme position, with the weaving process in order, preserves frictional engagement between the main shaft and the driving motor and which in the other extreme position, in the case of disturbances in the weaving process, produces frictional engagement between the main shaft and a brake rigidly connected to the machine frame.

Abstract: An apparatus for reversing and racing a card in a dobby machine by using a planetary gear mechanism for reversing a card cylinder by a specified angle and operating a card handle fixed on the shaft, thus avoiding damage to the machinery even when operational errors occur.

Abstract: In a double-left Jacquard of the Verdol type in which the cam system adapted to actuate the pusher grid must be displaced angularly on its driving shaft between a first and a second position, or vice versa, whenever the direction of rotation of the loom is reversed, a reversing mechanism is provided by which this displacement is automatically accomplished when the Jacquard starts rotating. For this purpose said cam system, loosely journaled on its driving shaft, has a gear wheel which meshes with a first planet gear, the shaft of which is supported by a planet carrier keyed on the driving shaft. The planet shaft carries a second planet gear which meshes with a toothed sector carried by a drum having a limited angular freedom on the driving shaft and subjected to the action of a brake. Means are provided to release the brake when the cam system has been displaced.