Bookbinding Apparatus Adhesive Coating Thickness Control
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Solution Overview
Problem
Existing bookbinding apparatuses face issues with non-uniform adhesive layer thickness and inconsistent booklet quality due to varying sheet bundle thickness, leading to excessive adhesive and poor binding, especially when switching between thick and thin booklets.
Innovation Solution
A bookbinding apparatus that adjusts adhesive coating thickness based on both sheet bundle thickness and booklet information, including the number of sheets, to ensure consistent coating across different thicknesses, using a control system that adjusts the coating device's position and thickness regulation members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If coating thickness is increased for thick booklets to obtain necessary adhesive strength, then adhesive strength is improved, but adhesive is squeezed out as side adhesive when wrapping with cover, resulting in excessive adhesive and poor binding
Solution Approach 1:
The coating device incorporates a movable coating amount adjustment mechanism that dynamically changes the coating thickness based on the detected booklet thickness. The coating amount is made variable rather than fixed, allowing the system to adapt to different booklet thicknesses and prevent both insufficient adhesion and excessive side adhesive overflow
Solution Approach 2:
The system changes the coating parameter (coating thickness) based on the input parameter (booklet thickness). By establishing a relationship between booklet thickness and optimal coating thickness, the system adjusts the coating amount to match the specific requirements of each booklet, resolving the contradiction between needing sufficient adhesive strength and avoiding excessive adhesive overflow
2Object-generated harmful factors
If coating thickness is decreased for thin booklets to avoid excessive adhesive, then side adhesive is prevented, but adhesive strength becomes insufficient for thick booklets
Solution Approach 1:
The coating device uses a movable coating amount adjustment mechanism that dynamically adapts the coating thickness to the booklet thickness. This dynamic adjustment ensures that thin booklets receive appropriate minimal coating to avoid side adhesive, while thick booklets receive sufficient coating for adequate adhesive strength
Solution Approach 2:
The system establishes a parameter relationship where coating thickness is adjusted according to booklet thickness. This parameter change approach ensures that each booklet receives the optimal coating amount for its specific thickness, preventing both excessive adhesive overflow in thin booklets and insufficient adhesion in thick booklets
3Ease of operation
If threshold-based coating control is used to simplify coating amount adjustment, then coating control becomes easier, but judgment for control changes for every sheet bundle near threshold value, resulting in different adhesive layers and lack of uniformity
Solution Approach 1:
The system replaces static threshold-based control with dynamic continuous adjustment based on actual booklet thickness measurement. Instead of abrupt changes at threshold values, the coating amount is continuously adjusted according to the measured thickness, eliminating judgment inconsistencies and ensuring uniform adhesive layers across all booklets
Solution Approach 2:
The system incorporates a thickness detection device that provides feedback on the actual booklet thickness to the coating control mechanism. This feedback loop enables continuous adjustment of coating amount based on real measurements, preventing the judgment inconsistencies that occur with threshold-based methods and ensuring consistent adhesive layer uniformity across all booklets
Data Source
AI summary
The problem of unevenness that an outer shape is different for each booklet is solved by correcting coating thickness control depending on a thickness of a sheet bundle, based on booklet information which includes information on at least the number of sheets constituting the sheet bundle, keeping adjustment of a coating thickness for adhesive depending on a thickness of a sheet bundle as a basic method.