Medium aligning device, medium processing apparatus, and recording system

A medium aligning device comprising:

• a stacking tray that stacks a medium discharged by a discharge section that discharges the medium;
• a side end aligning device that is movable in a width direction that is a direction intersecting with a medium discharge direction of the discharge section, and positions and aligns a side end in the width direction of the medium stacked on the stacking tray;
• a rear end aligning device that is movable in the width direction and positions and aligns a rear end that is an upstream end of the medium stacked on the stacking tray in the discharge direction;
• and
• a transmission device that transmits the movement of the side end aligning device in the width direction to the rear end aligning device, wherein
• a play in the width direction is provided between the side end aligning device and the transmission device,
• when a direction from a center position of the medium in the width direction toward the side end is an outward direction and a direction from the side end toward the center position is an inward direction, an outward movement limit position of the rear end aligning device in the width direction is located in the inward direction from an outward movement limit position of the side end aligning device,
• an inward movement limit position of the rear end aligning device in the width direction is located in the outer direction from an inward movement limit position of the side end aligning device,
• the rear end aligning device is provided with an abutting device that is located upstream of the stacking tray in the discharge direction, that is configured to advance and retreat with respect to a movement area in the width direction of a processing device that performs processing on the medium, and that abuts on the processing device in a state in which the abutting device is advanced into the movement area,
• an advance and retreat restricting device that makes the rear end aligning device movable in the outward direction following the processing device by retracting the abutting device from the movement area of the processing device when the processing device abuts on the abutting device while moving in the inward direction and maintaining the abutting device at the advanced position when the processing device abuts on the abutting device while moving in the outward direction,
• the advance and retreat restricting device includes:
• a rotation member configured to rotate and rotatably support the abutting device,
• a first spring that is provided between the abutting device and the rotation member, and applies a spring force to the abutting device in a direction in which the abutting device advances into the movement area of the processing device, and
• a second spring that is provided between a base member on which the rear end aligning device is provided and the rotation member, and applies a spring force to the rotation member in a direction in which the abutting device projects into the movement area of the processing device,
• the abutting device is configured to advance and retreat with respect to the movement area of the processing device by rotating with respect to the rotation member and is configured to advance and retreat with respect to the movement area of the processing device with rotation of the rotation member,
• the abutting device is supported by the rotation member so as to be rotatable with respect to the rotation member when the processing device moving in the inward direction abuts on the abutting device, and so as to be unrotatable with respect to the rotation member when the processing device moving in the outward direction abuts on the abutting device,
• when the processing device moving in the inward direction abuts on the abutting device, the abutting device rotates with respect to the rotation member against the spring force of the first spring so that the abutting device is retracted from the movement area of the processing device, and
• when the processing device moving in the outward direction abuts on the abutting device, the abutting device and the rotation member do not rotate together, and a state in which the abutting device is advanced into the movement area of the processing device is maintained by the spring force of the second spring so that the rear end aligning device moves in the outward direction.