Drive transmission switching mechanism, paper sheet storage unit, and paper sheet processing device

A drive transmission switching mechanism that switches and transmits a drive force from a single motor selectively to either one of a first load and a second load, the drive transmission switching mechanism comprising:

• a main drive gear driven to be rotated upon reception of a drive force from an output gear of the motor;
• a fixed shaft that pivotally supports the main drive gear so as to be able to rotate via a rotary sleeve;
• the rotary sleeve that is supported so as to be able to rotate relative to the fixed shaft inserted into a central hole thereof and fixedly supports a shaft core of the main drive gear;
• a first transmission gear that transmits a drive force toward the first load, with a shaft hole being pivotally supported so as to be able to rotate relative to the rotary sleeve on a second axial direction side of the main drive gear;
• a second transmission gear that transmits the drive force to the second load, with a shaft hole being pivotally supported so as to be able to rotate relative to the rotary sleeve biased toward a second axial direction of the first transmission gear;
• first dog teeth and second dog teeth each provided on opposite surfaces of the first transmission gear and the second transmission gear;
• a dog clutch key that is supported axially movably by the rotary sleeve portion located between the first transmission gear and the second transmission gear and meshes with the first dog teeth when located at a position biased toward a first axial direction, and meshes with the second dog teeth when located at a position biased toward the second axial direction;
• a first resilient member arranged between the rotary sleeve located closer to the first axial direction than the dog clutch key and the fixed shaft, and a second resilient member arranged between the rotary sleeve located closer to the second axial direction than the dog clutch key and the fixed shaft;
• and
• a pressurizing member inserted into a gap between an outer periphery of the fixed shaft and a central hole of the rotary sleeve from the first axial direction to press the dog clutch key against the second transmission gear via the first resilient member, wherein
• when the pressurizing member is not pressing the first resilient member, or is not pressing the first resilient member with a force equal to or larger than a predetermined value, the dog clutch key meshes with the first dog teeth of the first transmission gear by the second resilient member, to transmit the drive force from the main drive gear to the first load, and
• when the pressurizing member presses the first resilient member, the dog clutch key meshes with the second dog teeth of the second transmission gear, to transmit the drive force from the main drive gear to the second load.