Winding device for automatically changing bobbin tubes

Claim 1

A winding device for automatically changing tubes for takin-up endless threads or the like, said winding device being provided with a thread traversing device for generating thread winding wraps, a thread deflecting device for lifting the thread off the thread traversing device, a thread holding device provided with a thread guiding device for guiding the thread in its lifted-off position during the change of the bobbin tube, a drive drum, and at least two bobbin chucks driven by said drive drum and alternately brought into a bobbin or tube change position respectively, each of said bobbin chucks supporting one tube, a thread catching- and cutting zone arranged adjacent to one end of the associated tube and rotating with such tube, said thread holding device being arranged such that the thread lifted off the thread traversing device is guided thereby in the immediate vicinity of the thread catching and cutting zone, shifting means for shifting the thread holding device and thereby the thread in a first thread shifting step from a position at the immediate vicinity of the thread catching- and cutting zone through such zone and onto an end portion of the tube adjacent thereto, and which shifting means in a second thread shifting step shifts the thread over a predetermined distance on such tube for creating reserve wraps, said shifting means shifting the thread at a higher shifting speed during the second step than during the first step, said shifting means comprising a substantially linearly movable drive element movable in a direction substantially parallel to the lengthwise axis of the associated bobbin chuck, said drive element being connected with the thread holding device, a first thread guide element provided with a thread guide notch for taking-up the thread after the latter has moved over a distance corresponding to the first thread shifting step, means for mounting said first thread guide element, a second thread guide element connected with the thread holding device at a location between the drive element and the thread guiding device of the thread holding device, said second thread guide element being provided with a thread guide surface arranged at an inclination with regard to the direction of movement of the thread holding device such that said thread guide surface, during such time as the thread holding device moves over a distance corresponding to the second shifting step, shifts the thread along a side surface of said thread guide notch of the first thread guide element and immediately prior to completion of the second shifting step shifts the thread over an end of such side surface, the improvement comprising: said means for mounting the first thread guide element including means for arranging said first guide element to be movable in a direction of the thread shifting movement in a manner such that at least one additional shifting step is performed between the first and second shifting steps and which additional shifting step is directed opposite to said first and second shifting steps.