Fraud prevention mechanism, paper sheet transport device, and paper sheet handling device

Abstract

The present invention solves a problem that the posture of an opening / closing member is fraudulently changed to an initial rotational posture during waiting for reception of a paper sheet while effectively preventing misalignment in the stop position of the opening / closing member. The present invention includes an opening / closing member (50), a rotary member (70) that rotates integrally with the opening / closing member, a driving member (90) for opening / closing member driving, that is arranged to oppose the rotary member and that is axially supported to be capable of relatively rotating with respect to the rotary member, and a drive transmission mechanism (100) that transmits a drive force from the driving member to the rotary member, in which the drive transmission mechanism includes a driven piece (74), and a driving piece (92) that rotationally drives the rotary member by pressing the driven piece, and a value of a circumferential backlash (θ3) between the driven piece and the driving piece is set to a value that enables prevention of the opening / closing member from being rotated to transition to the initial rotational posture by an operation from outside while the opening / closing member is stopped in the non-initial rotational posture.