1 and all motor rollers 14 in conveying section a 2 at the high speed thereby carrying object l 2 in conveying section a 2 downstream at the high speed and discharging it out of the conveying section while rotating motor roller 14 in the downstream portion of conveying section a 1 at the low speed the state shown in fig1 b in case the processing unit at the downstream side of accumulating conveyor 11 is outputting accumulation command signals when object l 2 discharged from conveying section a 2 is detected at conveying section a 1 all motor rollers 14 in conveying section a 1 are halted so that object l 2 rests in conveying section a 1 in case there is an outstanding clearing command signal the apparatus rotates all motor rollers 14 in conveying section a 1 at the high speed to move object l 2 in conveying section a 1 downstream at the high speed to discharge it out of the conveying section as described above when object l 1 has been carried out of a conveying section by means of high speed rotation of all motor rollers 14 in conveying section a 1 the apparatus rotates motor roller 14 in the downstream portion of conveying section a 1 at the low speed and rotate motor roller 14 in the upstream portion at the high speed thereby getting conveying section a 1 ready for arrival of object l 2 from the upstream side meanwhile all motor rollers 14 of conveying section a 2 located upstream from conveying.