Weft yarn feeding device having a rotating retainer

A device for feeding weft yarns to a weaving machine provided with a weft insertion device, said device comprising a prewinder which includes a storage drum for storing a weft yarn supply, a winding mechanism for replenishing the weft yarn supply, and a controlled retainer which is adapted to be driven in the circumferential direction of the storage drum by a rotary drive means such that the retainer carries out a circulatory movement, said controlled retainer extending at least temporarily through a circulatory path of a withdrawal point of the weft yarn which is adapted to be unwound overhead from the storage drum by means of said weft insertion device, wherein when viewed in the direction of circulation of the withdrawal point, the retainer continuously extends through the circulatory path ahead of the weft yarn and has little mass, the rotary drive means of the retainer including an acceleration and/or deceleration booster and being connected to a control device with which a circulatory speed profile of the retainer is controlled while supervising the angular position of the retainer, said circulatory speed profile determining the process of weft insertion in the weaving machine.

A device for feeding weft yarns to a weaving machine provided with a weft insertion device, said device comprising a prewinder which includes a storage drum for storing a weft yarn supply, a winding mechanism for replenishing the weft yarn supply, and a controlled retainer which is adapted to be driven in the circumferential direction of the storage drum by a rotary drive means such that the retainer carries out a circulatory movement, said controlled retainer extending at least temporarily through a circulatory path of a withdrawal point of the weft yarn which is adapted to be unwound overhead from the storage drum by means of said weft insertion device, wherein when viewed in the direction of circulation of the withdrawal point, the retainer continuously extends through the circulatory path ahead of the weft yarn and has little mass, the rotary drive means of the retainer including an electric motor and being connected to a control device with which a circulatory speed profile of the retainer is controlled while supervising the angular position of the retainer, said circulatory speed profile determining the process of weft insertion in the weaving machine, a contact-less signal and operating-voltage transmission path being provided between the electric motor and the control device.

A device for feeding weft yarns to a weaving machine provided with a weft insertion device, said device comprising a prewinder which includes a storage drum for storing a weft yarn supply, a winding mechanism for replenishing the weft yarn supply, and a controlled retainer which is adapted to be driven in the circumferential direction of the storage drum by a rotary drive means such that the retainer carries out a circulatory movement, said controlled retainer extending at least temporarily through a circulatory path of a withdrawal point of the weft yarn which is adapted to be unwound overhead from the storage drum by means of said weft insertion device, wherein when viewed in the direction of circulation of the withdrawal point, the retainer continuously extends through the circulatory path ahead of the weft yarn and has little mass, the rotary drive means of the retainer being connected to a control device with which a circulatory speed profile of the retainer is controlled while supervising the angular position of the retainer, said control device including at least one programmable microprocessor, and said circulatory speed profile determining the process of weft insertion in the weaving machine.