Source: {"pile_set_name": "USPTO Backgrounds"}

This invention relates to a ring tenser used in a twisting machine or the like for applying appropriate tension to a yarn when it is unwound from a yarn supply package.
In such ring tensers, a slightest difference in weight will have a significant effect on characters of a yarn produced. Accordingly, selection of a ring employed in such ring tensers is done with care. In consideration of these circumstances, normally a structure is employed which facilitates replacement of a ring so that a ring may be promptly exchanged for another ring in accordance with characters of a yarn to be processed and so on.
The present invention has thus been made to eliminate such troubles that the ring is accidentally dropped or lost and so on in operation of a conventional ring tenser which may often occur during exchanging operations of a ring. Details of such troubles will become apparent from the following description of a prior art structure given in connection with FIGS. 1 and 2.