Abstract: Two sensors are arranged on the catch side of the weaving shed of the weaving machine. These two sensors scan the length of the weft-thread end which protrudes from the weaving shed beyond the catch side end thereof and define a range of reference or set values for the length of the protruding weft-thread end. When the front end of the weft-thread, upon standstill of the weft thread after the weft insertion operation, is located within the range of the reference or set values, there is not accomplished readjustment of the weft-thread brake. When the front end of the weft thread falls short or upstream of a first one of the two sensors which is placed close to the catch side end of the weaving shed, then the closure of the weft-thread brake is effected at a later moment of time during the next weft insertion operation.

Abstract: An inductive projectile sensor on a gripper shuttle weaving machine or loom comprises a flat induction coil surrounding at least one of the guide teeth which are mounted on the lathe beam of the weaving machine to form a guide duct for the projectile when passing through the weaving shed. Means for magnetizing the guide tooth or teeth, such as a permanently magnetized small plate or lamella, are provided beneath the induction coil to form a magnetic core or bridge between two neighboring guide teeth, one of which is surrounded by the induction coil.

Abstract: Electronic control device on a gripper shuttle or projectile weaving machine or loom containing a lathe beam and thereto fixed teeth for guiding the gripper shuttle or projectile which inserts the weft or filling thread into the weaving shed, and a thread brake located at the picking side of the loom. The electronic control device comprises a sensor arranged on the lathe beam at least at one of the guide teeth and which furnishes an electrical sensor signal when the projectile passes by, an evaluation circuit connected to the sensor, and an electromagnetic device operatively connected to the evaluation circuit such as to actuate the thread brake upon appearance of an electrical sensor signal.

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: The transducer for sensing the position of a weft picking means in the picking path is mounted in a recess of one of the guide teeth guiding the picking means. The transducer is a piezo-electroacoustic transducer. The transducer may also be mounted on an exterior surface of the guide tooth and may be of a different type, e.g. a strain gauge. Other transducers can be mounted on other guide teeth to control different machine operations.

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: Each shuttle of a multiple-shuttle weaving machine is provided with at least one shuttle magnet. A drive unit acts upon each shuttle magnet to effect positive magnetic transport of the shuttle through the length of the shed, without physically contacting the shuttle. The shuttle monitoring device includes a magnetic-field-dependent resistor for each shuttle to be monitored. The magnetic-field-dependent resistor is moved in parallel to and in synchronism with the drive unit for the shuttle and moves in a region where the resistor is influenced by at least one pole of the shuttle magnet. A machine shut-off device is connected to the resistor and is operative for shutting off the drive units for the shuttles of the weaving machine in response to a resistance change of the magnetic-field-dependent resistor indicative of lack of proper shuttle movement.

Abstract: A monitoring system for the shuttle movements in a loom of the multiple moving shuttle type. Sensors are located at the end of shuttle travel through the shed, at the beginning and end of its recycling travel back to the transporting drum, and phase sensors are provided to indicate proper position of the transporting drum. Whenever any of the sensors detects a fault in the position or phase of the shuttle or transporting drum, the fault is indicated and the loom is normally shut down until the fault is cleared.

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: An improved shuttle drive for a narrow ware loom which includes a batten which is moved vertically in a pattern to one of several positions, a warp shed and a vertical row of shuttles mounted on the batten for vertical movement therewith and positioned so that only one of the shuttles is in active position for each position of the batten, the shuttles being mounted on the batten for horizontal movement through the warp shed. The improvement includes means for detecting which side of the shed the active shuttle is on, first actuating means for moving the active shuttle from one side of the warp shed, second actuating means for moving the shuttle to the opposite side of the warp shed and control means operatively connected to the detecting means for activating the appropriate actuating means.