Abstract: A freely rotatably mounted roll body couplingly engageable with a brake shaft comprises an exchangeable thread brake liner. The rotatable roll body carrying the thread brake liner in a groove is exchangeably mounted between stationary guide discs which extend radially beyond the roll body on both sides and form a radial continuation of walls of the roll body, laterally defining a thread groove with their radially protruding portions and between which the roll body is exchangeably arranged.

Abstract: The needle of an individual embroidery location of a multitude or row of linearly arranged embroidery locations in an embroidery machine is mounted at an axially displaceably guided needle carrier. According to a programmed control and by means of a related switching lever the needle can be individually coupled to or decoupled from an oscillating drive rail which is common to all the needles of the row. A thread guiding roller which is journaled for free rotation at a roller supporting lever and associated with a related one of the needles supplies a thread to the related needle. Simultaneously with the coupling or decoupling of the needle to the oscillating drive rail the roller supporting lever is pivoted between an operative position and an inoperative position in which the thread guiding roller is respectively coupled to or decoupled from a braking member which is common to all embroidery locations.