Sheet Binding Unit with Dynamic Water Application for Crimping
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Solution Overview
Problem
Existing sheet binding technologies face challenges in maintaining the appearance of bound sheets, particularly when the number of sheets is small, as water application can lead to twisting or warping, and existing methods struggle to control the amount of water effectively, resulting in excessive fiber unfolding and poor finishing quality.
Innovation Solution
A sheet processing device with a binding unit that applies water to the crimping range only when the number of sheets exceeds a predetermined number, using pressure teeth to crimp the sheets without water application when the sheet count is low, thereby preventing twisting or warping and ensuring a better appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If water is applied to the sheet surface to enhance fiber entanglement and bonding power, then the fastening force between sheets is improved, but the sheet surface may become shabby or twisted when the number of sheets is small, degrading appearance quality
Solution Approach 1:
The patent changes the parameter of water application based on the number of sheets to be bound. When the sheet count exceeds a predetermined threshold, water is applied to enhance fiber entanglement and fastening force. When the sheet count is small, water application is omitted to prevent surface degradation and maintain appearance quality. This dynamic parameter adjustment resolves the contradiction between strength and appearance quality.
2Strength
If water is applied along the sheet edge to facilitate fiber entanglement during conveyance, then the bonding power among fibers is increased, but the non-crimped parts of the sheet become shabby, deteriorating finishing quality
Solution Approach 1:
The patent applies water locally only to the crimping position on the sheet surface, rather than along the entire sheet edge. This localized water application ensures that fiber entanglement is enhanced only where crimping occurs, while the non-crimped parts of the sheet remain unaffected and maintain their original appearance, thus preserving finishing quality while still improving bonding power at the binding location.
3Device complexity
If a fixed amount of water is applied through a single water hole in the pressure teeth, then the device structure is simple, but the amount of water cannot be controlled according to the number of sheets, leading to either insufficient or excessive water application
Solution Approach 1:
The patent introduces a dynamic control mechanism where the water application amount is adjusted based on the number of sheets to be bound. The control unit determines whether to apply water by comparing the sheet count against a predetermined threshold, enabling the system to adapt water application to different binding scenarios. This dynamic approach resolves the contradiction between simple device structure and adaptable water control.
4Manufacturing precision
If masking is performed to limit water application range and prevent shabby appearance, then the finishing quality is improved, but the device complexity increases due to additional masking components
Solution Approach 1:
The patent achieves localized water application directly through the pressure teeth structure, which are designed to apply water only at the crimping position. This eliminates the need for separate masking components while still preventing water from reaching non-crimped areas. The local quality is achieved through the inherent design of the pressure teeth rather than through additional masking mechanisms, thus improving finishing quality without significantly increasing device complexity.
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 approach improves the appearance of the finished sheet bundle by preventing twisting or warping when the number of sheets is small and allows for controlled water application to enhance fiber entanglement when more sheets are bound, resulting in a stronger and more aesthetically pleasing bond.
Implementation Method 1
when water is permeated into a sheet made of a paper material, fibers of the sheet are unfolded and become easy to be entangled with each other, resulting in an increase in bonding power among fibers
Data Source
AI summary
A sheet processing device has a binding unit that applies water to a crimping range of sheets and then crimps the sheets. The sheet processing device includes a processing tray on which sheets are placed, a pair of pressure teeth (pressure teeth and receiving teeth) that crimps the sheets placed on the processing tray at a crimping position with the sheets interposed therebetween, and a water application member (cylinder and piston) that applies water to the crimping position before crimping by the pressure teeth. When the number of sheets placed on the processing tray is equal to or less than a predetermined number, the sheets are crimped by the pressure teeth without water application; while when the number of sheets placed on the processing tray exceeds the predetermined number, the sheets are crimped by the pressure teeth after water application.