Staple-free Binding Unit with Detachment Teeth
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Solution Overview
Problem
Conventional sheet processing apparatuses that bind sheets without staples face issues where increased force to secure the bundle results in the sheets becoming stuck to the binding teeth, hindering conveyance and recycling processes.
Innovation Solution
A sheet processing apparatus featuring a binding unit with a first and second portion that deform the sheet bundle in the thickness direction for binding, and a detachment unit that urges the bound bundle away from the binding teeth to prevent sticking, utilizing a detachment plate spring or pin to facilitate easy release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If increased force is applied to fasten sheets more securely, then binding strength is improved, but sheets become stuck to the teeth
Solution Approach 1:
The binding unit is divided into multiple teeth (first teeth and second teeth) with different functions. The first teeth perform the binding action while the second teeth are specifically designed for detachment. This segmentation allows the binding force to be applied effectively without causing sheets to stick permanently to the teeth, as the second teeth facilitate easy release.
Solution Approach 2:
The second teeth act as an intermediary mechanism between the binding process and the detachment process. After the first teeth bind the sheets, the second teeth provide a controlled release mechanism that prevents sheets from sticking while maintaining binding strength during the binding operation.
2Ease of manufacture
If staple-free binding is used to improve recyclability, then ease of recycling is improved, but sheets may still stick to teeth during conveyance
Solution Approach 1:
The binding unit is segmented into first teeth for binding and second teeth for detachment. This segmentation enables staple-free binding that maintains recyclability while preventing sheets from sticking during conveyance, as the second teeth ensure clean release without residue.
Solution Approach 2:
The binding unit is designed to perform both binding and detachment functions automatically during the binding operation. The second teeth enable the system to detach sheets automatically after binding, eliminating the need for manual intervention or external tools for recycling.
3Reliability
If binding unit uses teeth to bind sheets, then binding effectiveness is improved, but detachment becomes difficult without external tools
Solution Approach 1:
The binding unit is divided into first teeth for effective binding and second teeth for easy detachment. This segmentation resolves the contradiction by providing dedicated surfaces for each function, allowing sheets to be bound securely while enabling simple release without external tools.
Solution Approach 2:
Instead of designing teeth that are difficult to detach from, the invention inverts the approach by providing separate teeth whose primary function is to facilitate detachment. The second teeth are configured to push sheets away from the first teeth, making detachment as easy as pressing a button.
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
The solution effectively prevents sheets from sticking to the binding teeth, ensuring smooth conveyance and recycling by securely detaching the bound sheets without the need for external tools, enhancing the recyclability and operational efficiency of the apparatus.
Implementation Method 1
a detachment plate spring or pin to facilitate easy release
Data Source
AI summary
A sheet processing apparatus includes a binding unit including a first portion and a second portion and configured to nip a sheet bundle between the first portion and the second portion to deform the sheet bundle in a thickness direction to bind the sheet bundle, and a detachment unit configured to push the bound sheet bundle toward the second portion to detach the bound sheet bundle from the first portion.