Abstract: An apparatus for the mechanical operation of thread or yarn guides in textile making machines. The apparatus includes selectors arranged longitudinally of the guides, and by means of pulses supplied from outside, the selectors are adapted, by form-closed engagement with the guides, to prevent and, in the absence of an engagement, to permit the guides being carried along by continuously reciprocating operating means. The apparatus also includes spring means which tend to move the guides out of such an engagement with the selectors as will prevent the guides being carried along by the operating means.