Variable Nipping for Square Back Saddle Stitching
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Solution Overview
Problem
The existing post-processing methods for saddle stitching and square back processing often result in a center folding trace on the spine cover, degrading the quality of the booklet and making it difficult to maintain stitching position accuracy, especially when no center folding is performed.
Innovation Solution
A post-processing apparatus with a folding section using multiple rollers to form a fold line and a control section that adjusts the nipping amount based on whether square back processing is executed, with the option to change the insertion amount of a knife depending on the type of sheet and presence of an image on the spine cover, to minimize the center folding trace and maintain stitching accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the nipping amount in the folding section is increased to form a clear fold line for saddle stitching, then the fold line formation is improved, but a center folding trace remains on the spine cover during square back processing, degrading booklet quality
Solution Approach 1:
The patent applies dynamics by making the nipping amount adjustable based on the processing mode. The control section dynamically changes the nipping amount of the folding section rollers depending on whether square back processing is executed. When square back processing is executed, the nipping amount is reduced to prevent center folding traces on the spine cover, while still maintaining sufficient nipping to form the fold line for saddle stitching.
Solution Approach 2:
The patent applies parameter changes by modifying the nipping amount parameter of the folding section based on the processing conditions. The control section changes the nipping amount parameter according to whether square back processing is executed, thereby optimizing the fold line formation while preventing harmful center folding traces on the spine cover.
2Object-affected harmful factors
If the nipping amount in the folding section is decreased to prevent center folding trace on the spine cover, then booklet quality is improved, but stitching position accuracy becomes difficult to maintain
Solution Approach 1:
The patent applies dynamics by making the nipping amount adjustable based on the processing mode. The control section dynamically changes the nipping amount of the folding section rollers depending on whether square back processing is executed. When square back processing is executed, the nipping amount is reduced to prevent center folding traces on the spine cover, while still maintaining sufficient nipping to form the fold line for saddle stitching.
Solution Approach 2:
The patent applies parameter changes by modifying the nipping amount parameter of the folding section based on the processing conditions. The control section changes the nipping amount parameter according to whether square back processing is executed, thereby optimizing the fold line formation while preventing harmful center folding traces on the spine cover.
3Shape
If square back processing is executed to flatten the spine folded portion, then the booklet appearance is improved, but the center folding trace deteriorates the image on the spine cover portion
Solution Approach 1:
The patent applies dynamics by making the nipping amount adjustable based on the processing mode. The control section dynamically changes the nipping amount of the folding section rollers depending on whether square back processing is executed. When square back processing is executed, the nipping amount is reduced to prevent center folding traces on the spine cover, while still maintaining sufficient nipping to form the fold line for saddle stitching.
Solution Approach 2:
The patent applies parameter changes by modifying the nipping amount parameter of the folding section based on the processing conditions. The control section changes the nipping amount parameter according to whether square back processing is executed, thereby optimizing the fold line formation while preventing harmful center folding traces on the spine cover.
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
This solution effectively reduces the center folding trace on the spine cover during saddle stitching, enhancing the quality of the booklet and maintaining stitching position accuracy, allowing for successful square back processing without image degradation.
Implementation Method 1
a folding section configured to nip a sheet using a plurality of rollers to form a fold line for saddle stitching
Implementation Method 2
the folding section nip the sheet using the plurality of rollers while inserting a knife from the rear of a portion where a fold line of the sheet is formed
Implementation Method 3
a control section configured to control the nipping amount in the folding section, the nipping amount in the folding section in the case where square back processing to flatten a spine folded portion of a sheet bundle on which a fold line for saddle stitching is formed is executed being smaller than that in the case where the square back processing is not executed
Data Source
AI summary
A post-processing apparatus includes a folding section configured to nip a sheet using a plurality of rollers to form a fold line for saddle stitching and a control section to control the nipping amount in the folding section. When carrying out square back processing to flatten the spine folded portion of a sheet bundle where a fold line for saddle stitching is formed, the post-processing apparatus allows the nipping amount in the folding section to be smaller than that in the case where the square back processing is not carried out.