11 can be composed of an elastically resilient material e g plastic in order to allow the retaining web 46 to undergo an elastic deflection when the bolt 45 is moved into the region of the retaining section 48 due to the circular clamped connection between the retaining sections 48 and the bolts 45 the carrier 20 and therefore the compaction module vm are able to pivot about the central axis w of the retaining section 48 in the operating position of the compaction module vm fig1 the suction drums 17 or a friction ring that is connected to the suction drums rest on the circumference of the driven delivery rollers 7 wherein the fiber material v to be compacted is located between the suction drums 17 and the delivery rollers 7 and is clamped therebetween the compaction module vm is fixed in this position by means of a web 62 which rests on a web 49 that is fastened on the carrier 20 in order to obtain a desired contact pressing force of the suction drums 17 on the delivery roller 7 the web is attached on a leaf spring 68 which is fastened on the pressure arm 10 by means of screws 69 after the pressure arm 10 is released and transferred into an upper position which is illustrated by dashed lines the compaction module vm also pivots due to its own weight into a lower position which is illustrated by dashed lines this pivot movement is limited in the downward direction by a stop 65 which.