A medium stacking device includes an intermediate stacker that receives a medium treated by a treatment portion, and a first alignment member as an example of a contact portion, that is configured to move between a first position for performing an alignment operation on the medium on the intermediate stacker, and a second position that is separated further from the leading edge of the medium than is the first position. Furthermore, the medium stacking device is provided with a stacking portion that stacks the medium discharged from the intermediate stacker. The medium discharged from the intermediate stacker is stacked on the stacking portion after a leading edge contacts the first alignment member positioned at the second position.

A loading unit includes a processing tray, alignment units, and a paddle. In the processing tray, a medium is placed. The alignment units are disposed an interval in a Y direction to align a downstream tip end in a positive A direction of the medium. The paddle moves the medium that has been fed onto the processing tray toward the alignment units. A coefficient of friction of a contact surface of the alignment unit is higher than a coefficient of friction of a front face of the alignment unit, and the contact surface is positioned downstream of the front face in the positive A direction.

A loading unit includes a processing tray, alignment units, and a paddle. In the processing tray, a medium is placed. The alignment units are disposed an interval in a Y direction to align a downstream tip end in a positive A direction of the medium. The paddle moves the medium that has been fed onto the processing tray toward the alignment units. A coefficient of friction of a contact surface of the alignment unit is higher than a coefficient of friction of a front face of the alignment unit, and the contact surface is positioned downstream of the front face in the positive A direction.

An image forming apparatus includes a processing tray, a post-processing controller, and a detection sensor. The processing tray is configured to support a sheet or a sheet bundle on which a post-processing is to be executed. The post-processing controller is configured to execute the post-processing on the sheet positioned on the processing tray. The detection sensor is configured to detect an object in a predetermined detection range including a space above the processing tray. The post-processing controller stops execution of the post-processing when the detection sensor detects the object at a determination timing other than a timing at which passage of the sheet or the sheet bundle through the detection range is estimated.

An image forming apparatus includes a processing tray, a post-processing controller, and a detection sensor. The processing tray is configured to support a sheet or a sheet bundle on which a post-processing is to be executed. The post-processing controller is configured to execute the post-processing on the sheet positioned on the processing tray. The detection sensor is configured to detect an object in a predetermined detection range including a space above the processing tray. The post-processing controller stops execution of the post-processing when the detection sensor detects the object at a determination timing other than a timing at which passage of the sheet or the sheet bundle through the detection range is estimated.

A paper sheet storage mechanism (e.g., a banknote storage mechanism 32) is provided with a pressing unit (e.g., pressing plate 46) which advances into a storage bag (e.g., banknote storage bag 34) held by a holding unit (e.g., holding member 36) and presses a portion of the storage bag from inside toward a placement unit (e.g., stage 40), thereby bringing a portion of the storage bag placed on the placement unit into a state in which paper sheets are stackable thereon. Before paper sheets are sent into the storage bag, the pressing unit is caused to advance into the storage bag and press the portion of the storage bag toward the placement unit.

A paper sheet storage mechanism (e.g., a banknote storage mechanism 32) is provided with a pressing unit (e.g., pressing plate 46) which advances into a storage bag (e.g., banknote storage bag 34) held by a holding unit (e.g., holding member 36) and presses a portion of the storage bag from inside toward a placement unit (e.g., stage 40), thereby bringing a portion of the storage bag placed on the placement unit into a state in which paper sheets are stackable thereon. Before paper sheets are sent into the storage bag, the pressing unit is caused to advance into the storage bag and press the portion of the storage bag toward the placement unit.

A device for moving a stack of products using a robot. The robot has an articulated arm and a first gripper for the stack of products. The first gripper is disposed on the articulated arm. A gripping device is disposed on the articulated arm, the gripping device contains the first gripper and a second gripper, the first and second grippers are positionable relative to one another. Robot advantageously provides a method of moving stacks of products in an automated way and in particular of depositing them in a turned or unturned arrangement.

A method moves a stack of products by a robot. The robot has an articulated arm and at least one gripper disposed on the articulated arm to grip the stack of printed products and the stack of products selectively being turned. The method includes pivoting the stack of products through an effective angle α1< >180° and subsequently pivoting the stack through an effective angle α2=180°−α1 or pivoting the stack back through an effective angle α2=−α1. This method of moving stacks of products is performed in an automated way and in particular of depositing them in a turned or unturned arrangement.

A stack of products is moved with a robot which has an articulated arm and at least one gripper disposed on the articulated arm to grip the stack of products. The stack of products can be selectively turned. The step of moving terminates at a selected deposit location of a number of deposit positions of a predefined deposit scheme. The stacks of products are moved in an automated way and, in particular, the stacks are deposited in a turned or unturned arrangement.