Sheet Postprocessing Device Curl Correction Pressing Member
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sheet postprocessing devices face challenges in accurately aligning the edges of stacked sheets, particularly when dealing with sheets that are prone to curling due to inkjet printing, which can lead to misalignment and paper jams.
Innovation Solution
The proposed sheet postprocessing device incorporates a table with a leading edge cursor, a stapling device for central binding, a center folding device, and a first pressing member that pivots to correct the curl of the sheet and ensure proper alignment with the cursor before stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air is blown through the delivery guide into between the sheets, then the next sheet is prevented from making close contact with the uppermost sheet, but the curl of the sheet near the leading edge is not corrected, resulting in misalignment
Solution Approach 1:
The pressing member is divided into multiple pressing surfaces (first pressing surface and second pressing surface) that act at different locations on the sheet. The first pressing surface corrects the curl at the leading edge while the second pressing surface maintains positioning, allowing simultaneous curl correction and jam prevention without interfering with the air blowing function
Solution Approach 2:
The pressing member acts as an intermediary mechanism between the sheet and the alignment system. By providing a dedicated pressing surface that contacts the sheet, it mediates the curl correction function separately from the air blowing function, enabling both alignment precision and jam prevention to work together
2Reliability
If the sheaf lifting cursor is moved to maintain correct sheet order, then sheet collision is prevented, but the leading edge of the sheet may not be properly aligned with the cursor due to curling
Solution Approach 1:
The pressing member performs preliminary curl correction on the sheet before it reaches the alignment stage. By pressing the leading edge of the sheet to flatten and align it with the cursor in advance, the system ensures that when the sheet is subsequently positioned, the leading edge is already properly aligned, preventing both misalignment and sheet collision
3Productivity
If inkjet printing is performed on the sheet, then the source document image is formed on the sheet, but the sheet becomes prone to curling which causes misalignment during stacking
Solution Approach 1:
The pressing member converts the harmful curling effect of inkjet-printed sheets into a beneficial alignment feature. By applying pressure to the leading edge, the system utilizes the curling tendency to guide the sheet into proper alignment with the cursor, transforming the inkjet-induced deformation from a misalignment cause into an alignment aid
Data Source
AI summary
A sheet postprocessing device includes a saddle binding device configured to stack a plurality of recording sheets on a table, abut leading edges of the respective recording sheets against a leading edge cursor, thus to align the leading edges with each other, and bind the center of the recording sheets and fold the recording sheets, and a first pressing member supported so as to pivot in a direction toward and away from the table. The first pressing member is made to pivot toward the table by self-weight thereof, allows the leading edge of the recording sheet delivered to the table to pass toward the leading edge cursor, and presses a portion of the recording sheet in a proximity of the leading edge, at a position upstream of the leading edge cursor, in a delivery direction of the recording sheet.