Paper sheet accumulation drum, paper sheet accumulation device, and paper sheet processing device

A paper sheet accumulation drum of a paper sheet accumulation device including:

• a receiving unit that receives transported paper sheets;
• a paper sheet accumulation drum that sequentially stacks and accumulates the paper sheets received through the receiving unit on an outer circumferential surface thereof one by one to form a paper sheet batch while rotating in a forward direction, and is rotatable in the forward direction and a reverse direction;
• and
• a transport guide member that is arranged along a turning movement path of the outer circumferential surface of the paper sheet accumulation drum and bring a paper sheet surface into contact with the outer circumferential surface of the paper sheet accumulation drum,
• the paper sheet accumulation drum comprising:
• a drum body which is driven to rotate;
• and
• a plurality of retractable members that are provided on a paper sheet accumulation portion of the outer circumferential surface of the drum body in a predetermined circumferential arrangement, are each configured to be retractable between a most protruding position protruding radially outward and a retreat position retreating from the most protruding position radially inward, are each elastically biased in a protruding direction, and each come into contact with the paper sheet surface on an outer surface,
• wherein the paper sheets are accumulated to spread over the retractable members,
• wherein each of the retractable members is configured to be retractable independently of each other,
• wherein one of the retractable members is a slip prevention portion where a contact member which comes into contact with the paper sheets has a frictional resistance which does not cause slipping with respect to the paper sheets, and the other retractable members include either a rotating body for reducing friction where a contact member which comes into contact with the paper sheets is rotatably supported or a material which can easily cause sliding with respect to the paper sheets, and
• wherein the paper sheets are banknotes, tickets, cash vouchers or securities.