The need for such devices


Roving bobbins are built up from a core outwards, i.e. the diameter increases steadily. For each bobbin dimension there is an associated defined bobbin speed and lift speed. If one roving breaks, while the frame continues production, the diameter of that one bobbin stays constant while the others continue to increase. If an attempt is made to piece the broken roving end after a certain time, this end will always break again because the peripheral speed of the smaller bobbin is no longer appropriate in the new winding conditions. In order to enable winding to continue on all bobbins after a break, it is necessary to stop the machine immediately after the break occurs: automatically operating stop motions are required.