Abstract: A power loom includes a frame, a plurality of warps, a weft spool, a plurality of wefts, and a speed adjustment device. The speed adjustment device includes a support rack, a rotation shaft, a drive motor, a sensor, a press member, and a press rod. Thus, when the output speed of the wefts is gradually reduced to a preset value, the wefts are tensioned and moved upward, and the press member is moved upward to touch the sensor which sends a signal to actuate the drive motor which increases the rotation speed of the rotation shaft and the weft spool to increase the output speed of the wefts largely so that the wefts can be pulled outward from the weft spool quickly to prevent the wefts from being torn or broken due to an excessive pulling force.

Abstract: A device for monitoring a weft in a circular loom where the weft is drawn-off from a bobbin of the weaving shuttle rotating along a circular path formed by a circular reed. The device includes a magnetic sensor stationarily arranged in a zone of the circular path of the weaving shuttle for generating an electronic control signal to turn off the loom when there is a fault in the weft creating an operative connection between the magnetic sensor and a permanent magnet. The magnet is carried by the weaving shuttle. The device has a pivoting lever having the permanent magnet arranged thereon. The device also includes a return spring that displaces the pivoting lever as well as the permanent magnet attached thereon towards a position where the operative connection between the magnetic sensor and the permanent magnet is made.

Abstract: A system for instantaneously detecting breakage of a weft yarn within the shed of a multiphase loom comprising a series of closed-loop induction coils which extend in succession along the entire weaving zone to cooperate with the rotating shuttle weft yarn packages, which are provided with at least one off-centered magnetic element.

Abstract: System of detection of a shed closed to passage of a shuttle in a multi-phase weaving textile loom. This invention is comprised of the following: sensitive control bars made elastically movable along the vertical direction, with a stroke at least equalling the vertical shift necessary for the shuttle roller to disengage from the corresponding thrust roller of the dragging chain of the same shuttle; two adjoining sensitive control blades, both are on the rotary-reed facing divergent side wall of each shuttle; the outward blade is fixed and rigid while the longer inward blade is rotatable around a vertical axis; and upon detection of a persistent entanglement by the control blades, a lever pin, kept in a retracted position by a retainer hook, is freed by movement of the retainer hook such that the lever pin springs outwards to protrude from the shuttle plane, pressing upon a sensitive control bar, generating a stop loom signal.

Abstract: Weft threads on a circular loom which are wound off the respective bobbin of the weaving shuttle traveling in the weaving shed along a circular path formed by the circular reed, and transferred onto the fabric edge of the tubular fabric, are supervised by a scanner in order to generate an electric stop signal in the case of a weft thread fault. This results from the use of a non-contact sensory system of capacitive, inductive, opto-electric or magnetic kind, with the scanner means comprising a tipping lever supported on the respective shuttle and acted upon by the drawn-off thread against the effect of a restoring force, said tipping lever functioning like a switch, in the case of a weft thread fault, and combined with at least one signal transmitting component of the sensory system arranged on the reed.

Abstract: In a circular loom provided with a motor for driving the loom, and annular guide means for guiding at least one shuttle along the annular guide, when a weft is broken or a yarn package formed on a bobbin held by a shuttle is exhausted, the driving of the circular loom is automatically stopped by a mechanism comprising a first detector for detecting a weft breakage, and/or a second detector for detecting an exhaustion of a yarn package, means for stopping an electric power from a power source to said motor, means for transmitting a signal from said first detector and/or said second detector to said stopping means.The above-mentioned first detector and second detector are mounted on each shuttle.

Abstract: In a circular loom a weft failure indicator system includes means for issuing a signal that a weft failure has occurred on the shuttle, and a detector adapted to detect the weft failure signal, the detector being located on a stationary part of the loom and adapted to receive signals at all positions around the path of the shuttle. This provides a more rapid response to weft failure than systems in which the signal is only detected once in every revolution of the shuttle.The shuttle signal is a radio frequency signal and the detector a circular aerial.

Abstract: A travelling yarn dispenser for use in a textile machine, particularly a circular loom shuttle has an electric generator the rotor of which is adapted to be driven by yarn leaving the dispenser. In the preferred construction the driving member of the generator frictionally engages with the yarn carrier, which is mounted for rotation in the dispenser.Several arrangements for using the current generated by the generator to give weft failure signals and pick-up means adapted to co-operate with these arrangements are described.

Abstract: A device for monitoring the travel of yarn-like structures at a textile machine comprises a cantilever member vibrating in a flexural mode when excited by a traveling yarn which is in contact with the upper or free end of said cantilever member. The lower end thereof is rigidly connected or integral with a rigid base member having the effect of a seismic mass when exposed to shock or vibration. Moreover, soft elastic material is provided to prevent transfer of such shock or vibration from the textile machine to the cantilever member. A mechano-electrical transducer element, e.g., a piezoelectric element, is comprised by or coupled with the cantilever member for generating an electrical yarn travel signal. A casing may be provided for protecting said cantilever member against ambient noise and other undesired actions acting from outside the casing.

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: A device for monitoring the travel of a yarn, particularly weft yarn in the shuttle of a loom, which device is designed as an assembly or unit comprising a piezoelectric transducer element, a yarn feeler member fixedly bonded with the transducer elements and arranged as a unilaterally clamped flexural vibratory member, and an induction coil operatively connected with the piezoelectric transducer element, and wherein a yarn guide means is provided at or near the free end of the vibratory yarn feeler member such that the yarn when traveling acts upon said feeler member in a restricted area thereof.