Abstract: This invention relates to a tensioning device for a drive belt for controlling the rotation of aligned members such as spindles of textile machines.According to the invention, a pressing roller is mounted at one movable end of an elastic support formed by two parallel tapes of hardened steel the confronting ends of which are fixed in equi-spaced relation by two spacers, while the other end of the support is rigidly fastened to the machine, so that the axis of the pressing roller is displaceable parallel to itself.
Abstract: In a drawing frame having a fibre-control system composed by two confrontingly and superposedly mounted closed-lap belts, the improvement consisting in that the upper-belt driving cylinder has a barrel-like sleeve of an elastomeric material of an appropriate hardness mounted thereon, so as to improve the fibre tow control and to adapt said cylinder to the processing requirements of tows or webs of variable bulk. It is preferred that the barrel-like sleeve is thinner at the middle section than at the end sections.