Abstract: A plurality of bobbin supports is movable along an endless track and each has a guide portion which engages the track, and a motion-transmitting portion. An arrangement is provided for advancing the bobbin supports along the track and includes a plurality of rotary drivers which are arranged along the track and which each have an angularly movable circular plate provided in a circumferential margin thereof with angularly spaced recesses each located in a sector of the plate. The margins of adjacent ones of the plates overlap one another and the motion-transmitting portions are engageable in the respective recesses so as to share part of the angular movement of the respective plate prior to engaging the margin of the adjacent plate and entering into a recess of the latter. A sound-damping arrangement is provided at the margins so as to dampen sound when the margins are engaged by the bobbin supports.