Paper accumulating device

A paper accumulating device, characterized in that a paper bundle feeding port (31), two paper bundle receiving portions (33, 34) including paper bundle receivers (21, 22) for accumulating paper bundles, and a delivery path (23, 24, 25) for delivering the paper bundles sequentially fed through the paper bundle feeding port (31) to the paper bundle receiving portions (33, 34), the paper bundle receiving portions (33, 34) being provided with sorting mechanisms (40, 60) for sorting the delivered paper bundles, the delivery path (23, 24, 25) including a main delivery path portion (23) extended from the paper bundle feeding port (31) to a branch point (32), and a plurality of mutually divergent branch delivery path portions (24, 25) extending each from the branch point (32) to one of the respective paper bundle receiving portions (33, 34), the branch point (32) being provided with a switching gate plate (26) selectively operable to connect the main delivery path portion (23) to a selected one of the branch delivery path portions (24, 25) respectively, wherein the paper bundle feeding port (31) sequentially receives the feeding of the paper bundles adjusted by the sheet collator (1), the paper bundle receiver (21, 22) provided on each of the paper bundle receiving portion (33, 34) includes a sensor for detecting that accumulation of the paper bundles is completed in the paper bundle receiver (21, 22), the paper accumulating device further comprising a control portion (70) for controlling operation of the switching gate plate (26) and a paper discharging speed of the sheet collator (1), the control portion (70) actuating the switching gate plate (26) in such a manner that the paper bundles are alternately delivered to the paper bundle receiving portions (33, 34) till the accumulation of the paper bundles is completed in one of the paper bundle receivers (21, 22), actuating the switching gate plate (26) in such a manner that the paper bundles are delivered to only one of the paper bundle receiving portions (33, 34) before the other paper bundle receiver (21, 22) is exchanged for a new empty paper bundle receiver when the sensor detects that the accumulation of the paper bundles has been completed in the paper bundle receiver (21, 22), and lowering the paper discharging speed of the sheet collator (1) to be adapted to an operating speed of the sorting mechanism (40, 60) of the other paper bundle receiving portion (33, 34).