Sheet Bundle Pressing Mechanism for Spine and Fold Reinforcement
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Solution Overview
Problem
Existing sheet processing apparatuses face issues with stacking failures when performing half-folding or saddle binding processes without forming a corner on the spine of the sheet bundle, leading to potential opening of the sheet bundle.
Innovation Solution
A sheet processing apparatus that includes a conveyance portion positioning the spine downstream, a pair of clamp units, a first pressing unit to perform a square back process by pressing the spine towards the clamp units, and a second pressing unit to reinforce the folding line, ensuring the spine and folding line are securely processed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a square back process is performed on the spine of the sheet bundle, then opening of the sheet bundle is suppressed, but stacking failure occurs when only half-folding or saddle binding process is performed
Solution Approach 1:
The apparatus dynamically selects between different pressing configurations based on the performed process type. The first pressing unit moves in the width direction to perform square back process when needed, while the second pressing unit performs pressing process on the folding line for half-folding operations. This dynamic adaptation allows the system to suppress sheet bundle opening when required while maintaining flexibility for different process types.
Solution Approach 2:
Different regions of the sheet bundle are treated differently based on the process type. When square back process is performed, the spine area is pressed to suppress opening. When only half-folding is performed, the folding line area is pressed by the second pressing unit. This localized quality approach ensures appropriate processing for each specific operation mode.
2Strength
If the spine of the sheet bundle is pressed toward the clamp units, then the spine is securely fixed, but the folding line may not be sufficiently reinforced
Solution Approach 1:
The pressing function is segmented into two independent units: the first pressing unit for pressing the spine toward the clamp units, and the second pressing unit for pressing the folding line. This segmentation allows each unit to specialize in its specific function, ensuring both spine fixation strength and folding line reinforcement quality without interference between the two processes.
Solution Approach 2:
The second pressing unit acts as an intermediary that specifically addresses the folding line reinforcement need. After the first pressing unit secures the spine, the second pressing unit intervenes to press the folding line, ensuring that both requirements are met through coordinated action of the two pressing units.
Data Source
AI summary
A sheet processing apparatus includes a pair of clamp units, a first pressing unit and a second pressing unit. The first pressing unit performs a square back process on a spine of the sheet bundle by moving the first pressing unit in a width direction of the sheet bundle in a state in which the spine of the sheet bundle is pressed toward the pair of clamp units. The second pressing unit performs a pressing process on a folding line of the sheet bundle by moving in the width direction of the sheet bundle while nipping the folding line of the sheet bundle.