17 is stretched via a bearing unit 15 mounted on the pressure arm 3 and a bearing body 15 1 which is connected to this unit 15 and thus its movement together with the top roller 9 over the delivery drafting roller 1 is provided by choosing the top roller 9 as soft as possible and by choosing the apron 17 as narrow as possible than the top roller 9 a higher pressure is applied on the fibre with the present pressure force in this case better fibre control and thus improvement in the yarn quality parameters are obtained the apron 17 materials being resistant against abrasion and its perimeter being larger than the top roller 9 long lasting usage with constant values are provided the perimeter of the apron 17 being larger than the perimeter of the top roller 9 is the factor which also increases its expected life in fig3 a the side schematic view of the mechanical compactor mechanism which is the subject of the invention and in fig3 b the perspective view of the mechanical compactor mechanism which is the subject of the invention are given mechanical compactor yarn production mechanism comprises a delivery drafting roller 1 which is made of.