b are equal in diameter whereas radius ra is greater than radius rb so that passage section sa is greater than passage section sb each conveyor 13 comprises two transmission pulleys 23 a 23 b and a drive pulley 23 c about which is looped a belt 24 and comprises a top branch 25 sloping slightly downwards from left to right in the accompanying drawing and with respect to direction d 2 that is each branch 25 slopes towards respective channel 7 to assist the downward flow of cigars 2 into channel 7 each channel 7 is defined by a vertical wall 26 tangent to pulley 23 b and by a wall 27 parallel to wall 26 and comprising an appendix 28 which extends about pulley 23 b is substantially parallel to a portion of branch 25 and is fitted on the free end with a revolving roller 29 wall 26 comprises a vertical surface 30 connected to pulley 23 b and wall 27 comprises a surface 31 having a portion parallel to and facing surface 30 a portion extending about the axis of pulley 23 b and a portion parallel to a portion of branch 25 appendix 28 has an upper face 32 on which the cigars 2 in hopper 4 rest and therefore defines a portion of channel 7 and a portion of bottom wall 15 of hopper 4 each outlet 6 of hopper 4 coincides with.