PROBLEM TO BE SOLVED: To prevent objects conveyed from inclining to the left and right on a belt of an accumulation conveyor. ;SOLUTION: An elevation frame 12 capable of elevating and sinking and air cylinder devices 14a, 14b to elevate and sink the frame 12 are installed under a plurality of accumulation rails provided parallel on a conveyor frame 2, and the frame 12 is furnished in row with a plurality of wheels 16 positioned between accumulation rails opposing in the direction across the width (left and right). A belt 18 is set on these wheels 16, and a slip preventive piece 29 formed from the first rod 30 and second rod 31 and turnable round the axis 36 across the width is furnished between the conveyor frame 2 and elevation frame 12, wherein the first rod 30 is formed over the whole width of the frame 12.;COPYRIGHT: (C)1997,JPO
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