Paper post-processing device and paper post-processing system

Abstract

To miniaturize a post-processing device by stacking a plurality of sheets to form a sheet bundle with a simple configuration and performing post-processing on the sheet bundle.SOLUTION: In a sheet post-processing device 20, a drive control part 58 is configured to: switch a switching claw 25 to a third switching position K3 every time a recording paper P is conveyed through a first conveyance path 21; guide a recording paper P from the first conveyance path 21 to a sub conveyance path 23; reverse a conveyance direction of the recording paper by the sub conveyance path 23 in an opposite direction; switch the switching claw 25 to a first switching position K1; guide the recording paper P from the sub-conveyance path 23 to an evacuation conveyance path 24 and evacuates; switches the switching claw 25 to the third switching position K3; guide at least one sheet of recording paper P from the evacuation conveyance path 24 to the second conveyance path 22; and cause at least one sheet of recording paper P to be processed by a stapling part 27.SELECTED DRAWING: Figure 2

Claims

1. A first main transport path that transports paper from the upstream side in the transport direction to the downstream side in the transport direction, and a second main transport path connected to the first main transport path, A secondary transport path is branched off at the branching point between the first main transport path and the second main transport path, and receives and transports the paper from the first main transport path. A siding transport path branches off from the first main transport path and the second main transport path at the aforementioned branching point to receive the paper from the auxiliary transport path, A switching unit is provided at the branching point and can switch to one of the following: a first switching position that guides the paper transported through the first main transport path from the first main transport path to the secondary transport path; a second switching position that guides the paper guided to the secondary transport path from the secondary transport path to the siding transport path; and a third switching position that guides the paper transported through the first main transport path from the first main transport path to the second main transport path, and also guides the paper guided to the siding transport path from the siding transport path to the second main transport path. A processing unit that processes a stack of paper sheets containing multiple sheets of paper guided to the second main transport path, and creates and discharges multiple stacks of paper sheets, The system comprises a drive control unit that controls the operation of the processing unit for creating the multiple paper bundles, The drive control unit, while processing a stack of paper in the preceding unit, switches the switching unit to the first switching position when the paper in the following unit is being transported through the first main transport path, guides the paper from the first main transport path to the secondary transport path for transport, reverses the transport direction of the paper in the secondary transport path while the paper is being transported, and switches the switching unit to the second switching position to guide the paper from the secondary transport path to the siding transport path for siding, and while at least one sheet of paper is guided to the siding transport path and siding, switches the switching unit to the third switching position to guide the at least one sheet of paper from the siding transport path to the second main transport path for transport, and causes the processing unit to process the at least one sheet of paper.

2. The paper post-processing device according to claim 1, wherein the drive control unit, while the at least one sheet of paper is guided to and stored in the siding transport path, switches the switching unit to the third switching position, guiding the next sheet of paper that has been transported through the first main transport path to the second main transport path, and guiding the at least one sheet of paper from the siding transport path to the second main transport path, stacking the next sheet of paper on top of the at least one sheet of paper and transporting it through the second main transport path, and causing the processing unit to process the next sheet of paper and the at least one sheet of paper.

3. A first discharge tray is provided at the paper discharge port of the second main transport path, The system includes a second discharge tray provided at the paper discharge port of the aforementioned sub-transport path, The paper post-processing device according to claim 1, wherein the drive control unit switches the switching unit to the first switching position to guide and transport the paper from the first main transport path to the sub-transport path, and discharges the paper from the sub-transport path to the second discharge tray, and switches the switching unit to the third switching position to guide and transport the paper from the first main transport path to the second main transport path, and discharges the paper from the second main transport path to the first discharge tray.

4. The paper post-processing device according to claim 3, wherein the drive control unit discharges a plurality of papers processed by the processing unit from the second main transport path to the first discharge tray.

5. An image forming apparatus that forms an image of a document onto paper, A paper post-processing device according to any one of claims 1 to 4, comprising: A paper post-processing system in which the drive control unit of the paper post-processing device receives the paper from the image forming apparatus, guides the paper to the first main transport path, the second main transport path, the sub-transport path, or the siding transport path for transport, and processes the paper with the processing unit.

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