Deformation Suppressing Unit for Curling Sheets in Post-Processing
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Solution Overview
Problem
Inkjet printing leads to deformation of sheets due to ink absorption and drying, causing curling and transport issues in post-processing devices, where sheets are not aligned properly, resulting in transport failures.
Innovation Solution
A post-processing device with a deformation suppressing unit that uses air blowers to control wind pressure based on moisture differences and ink composition, including water-based ink with 50% water or more, to prevent curling, and incorporates intermediate and finishing units for reversal processing and stapling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water-based ink is used for recording, then odor and strike-through are reduced, but sheet deformation increases
Solution Approach 1:
The deformation suppressing unit applies a preliminary counteracting force to prevent sheet deformation before it occurs during mounting. By detecting curling tendency based on recording data and applying opposing force through the deformation suppressing unit, the system prevents the harmful deformation effect rather than correcting it afterward.
2Productivity
If sheets are mounted sequentially on processing tray, then post-processing can be performed, but transport failures occur due to curling
Solution Approach 1:
The control unit receives recording data as feedback and uses this information to adjust the operation of the deformation suppressing unit. Based on the detected curling tendency from recording parameters, the system dynamically controls the suppressing force to maintain reliable sheet transport while enabling continuous post-processing operations.
Solution Approach 2:
The deformation suppressing unit performs preliminary action by suppressing curling before sheets are mounted on the processing tray. This preliminary suppression ensures that sheets remain flat and aligned during the subsequent mounting and post-processing operations, preventing transport failures.
3Manufacturing precision
If deformation suppressing unit is controlled based on recording data, then sheet alignment is improved, but device complexity increases
Solution Approach 1:
The system uses the existing recording data that is already available from the recording unit to control the deformation suppressing unit. Rather than requiring separate sensors or complex detection systems, the control unit leverages the self-generated recording information to determine appropriate suppression levels, simplifying the overall control architecture while maintaining precise sheet alignment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively suppresses sheet deformation, ensuring proper alignment and preventing transport failures by dynamically controlling air blower operation based on recording data and environmental parameters, enhancing the post-processing of water-based ink sheets.
Implementation Method 1
a deformation suppressing unit which suppresses deformation of the recording medium in the mounting unit
Data Source
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AI summary
A post-processing device is provided with a post-processing unit which performs post-processing of a recording medium on which recording is performed, a transport path through which the recording medium is transported, or a deformation suppressing unit which suppresses deformation of the recording medium on a mounting unit on which the recording medium is mounted, in which the deformation suppressing unit is controlled based on a predetermined parameter related to recording processing with respect to the recording medium.