Vertical Stacking in Sheet Bonding Apparatus
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Solution Overview
Problem
Conventional sheet bonding apparatuses using electrophotographic systems are large and expensive due to the integration of both image forming and adhesive application functions, and they face issues with temperature rise affecting the powder adhesive's adhesion quality, necessitating a miniaturized and cost-effective solution.
Innovation Solution
A sheet bonding apparatus is designed with an electrophotographic unit for applying powder adhesive, a folding portion for sheet folding, and a bonding portion for heating, where the bonding and folding components are positioned over the electrophotographic unit, and the discharge tray is placed above the powder adhesive accommodation area to minimize heat transfer and reduce the apparatus's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both image forming function and sheet bonding function are integrated in one apparatus, then the apparatus can perform multiple functions, but the apparatus becomes large and expensive
Solution Approach 1:
The patent applies vertical stacking of functional units to achieve three-dimensional space utilization. The electrophotographic unit, folding portion, and bonding portion are arranged vertically with the bonding and folding components positioned over the electrophotographic unit. This dimensional reorganization allows multiple functions to be integrated without increasing the horizontal footprint, effectively resolving the contradiction between functional versatility and apparatus size.
2Temperature
If the temperature of the apparatus body is raised by heat from bonding device and fixing device, then the bonding process can be performed, but the powder adhesive state changes and sufficient adhesion cannot be obtained
Solution Approach 1:
The patent positions the powder accommodating portion in the lower section while placing heat-generating components (bonding device and fixing device) in the upper section, creating vertical spatial separation. This dimensional arrangement allows the heated air to rise away from the powder adhesive, preventing temperature-induced state changes that would compromise adhesion quality, while still enabling the necessary heating functions for bonding.
Solution Approach 2:
The apparatus is segmented into distinct functional zones: the lower section houses the powder accommodating portion while the upper section contains the heat-generating bonding and fixing devices. This segmentation isolates the temperature-sensitive powder adhesive from direct heat exposure, allowing the bonding process to proceed without degrading the adhesive properties of the powder.
3Area of stationary object
If the size of the sheet bonding apparatus is reduced, then miniaturization is achieved, but heat transfer from bonding device and fixing device to powder adhesive increases
Solution Approach 1:
The patent resolves the heat transfer issue during miniaturization by utilizing vertical dimensional separation rather than horizontal distancing. The powder accommodating portion is positioned in the lower section while bonding and fixing devices are positioned in the upper section, creating a vertical thermal gradient that prevents heat transfer to the powder even in a compact apparatus configuration.
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 configuration allows for the miniaturization of the apparatus and reduces the temperature rise of the powder adhesive, ensuring effective adhesion and reducing the overall size and cost of the device while maintaining bonding efficiency.
Implementation Method 1
an electrophotographic unit configured to apply powder adhesive on a sheet by an electrophotographic process
Implementation Method 2
a bonding portion configured to heat the sheet folded by the folding portion to bond the sheet by the powder adhesive
Data Source
AI summary
A sheet bonding apparatus includes an electrophotographic unit configured to apply powder adhesive on a sheet by an electrophotographic process, a folding portion configured to fold the sheet on which the powder adhesive has been applied by the electrophotographic unit, and a bonding portion configured to heat the sheet folded by the folding portion to bond the sheet by the powder adhesive, wherein the bonding portion and the folding portion are disposed over the electrophotographic unit.