shaft 41 and right carrier 42 is fixed to right shaft 39 left and right shafts 41 and 39 are carried by main support 8 in addition left inner post 67 and right inner post 68 are carried on main support 8 left inner shaft 64 is rotatably mounted on left inner post 67 and right inner shaft 63 is rotatably mounted on right inner post 68 pulley 69 fixed to shaft 41 is connected through transmission 75 to pulley 70 which is fixed to a second drive shaft 66 pulley 72 on drive shaft 66 is connected through transmission 76 to pulley 71 mounted on shaft 64 in a like manner pulley 74 on drive shaft 66 is connected through transmission 77 to pulley 73 mounted on shaft 63 the other end of drive shaft 66 from pulley 70 is journalled for rotation in main support 8 in operation an external driving source not shown turns driving pulley 7 fig1 and 2 or 34 fig3 which in turn drives transmission 6 and pulley 5 fig1 and 2 or transmission 36 and pulley 43 fig3 to thereby turn main shaft 4 fig1 and 2 or left shaft 41 and main shaft 4 fig3 main carrier 30 turns with main shaft 4 and left carrier turns with left shaft 41 fig3 also.