Apparatus for the mechanical operation of thread or yarn guides

An apparatus for the mechanical operation of yarn guides comprising, selectors mounted at one end of the yarn guides, said selectors being operable in response to external pulses to respectively permit and prevent shifting of the said yarn guides from given positions, a pair of locking studs on each of said yarn guides, operating means continuously reciprocating between extreme dead center positions for shifting said yarn guides, said operating means including means for engaging said locking studs for positively shifting said yarn guides in both directions into and out of two extreme positions and a central position, spring means tending to move said yarn guides from said extreme positions, cooperating catch means on said yarn guides and on said selectors for releasably retaining said yarn guides in said extreme positions, said locking studs being adapted in response to the position of the associated selector to be respectively locked to and left unlocked from said operating means, the distance between said catch means on said yarn guides and said locking studs and the distance between said dead center positions of said operating means and said catch means on said selectors being such that as said operating means reaches said dead center positions, said yarn guides are moved a short distance against the action of said spring means whereby a form-closed engagement between said studs and selectors is canceled, said yarn guides being carried along by said operating means in the event that the position of the selector has been changed by an external pulse, while the locking engagement between the yarn guide and selector is only momentarily interrupted and the operating means returns without actuating the respective yarn guides when the selector position remains unchanged.