central drum 104 the compressive force at the nip between each tensioning roller 105 or 106 and the central drum 104 is 3 47 t and the compressive force at nip 112 is 1 73 t the total compressive forces acting on the web are 12 9 t no force other than assembly weight is transferred to the frame or foundation of the assembly fig2 is a different vector diagram of the forces in the system shown in fig2 fig2 is a vector analysis of a four roller system in which the rollers are spaced 90 u00b0 apart the compressive force due to the belt is the same as in fig2 and the vector analysis of the tensioning rollers is the same as in fig2 each of the idler nip rollers 113 and 114 provides a total compressive force at the nip of 1 414 t the total compressive forces acting on the web 108 are 12 3 t fig2 is similar to fig6 and illustrates the average pressures acting on the central drum 104 in fig2 the parameters for fig6 are also the parameters for fig2 this also shows the additional force on the web because of the present roller drum and belt configuration fig2 discloses another system for placing the four rollers the only difference between fig2 and fig2 is that the two tensioning rollers 105 and 106 are placed 15 u00b0 from the centerline of central drum 104 instead of 45 u00b0 as in fig2.