Stapleless Binding via Fiber Entanglement and Toner Correction
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Solution Overview
Problem
Conventional image forming systems that bind sheets without staples face challenges in maintaining sheet quality and recyclability, as toner images on the sheets hinder fiber entanglement, leading to unreliable stapleless binding.
Innovation Solution
An image forming system with a binding portion featuring tooth-like members that engage to entangle sheet fibers, accompanied by a correction mechanism to ensure the toner coverage ratio on the binding region is equal to or smaller than a predetermined value, allowing for effective stapleless binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stapleless binding is performed on sheets with toner images, then sheet quality and recyclability are improved, but binding reliability deteriorates because toner covers the sheet surface and prevents fiber entanglement
Solution Approach 1:
The system performs preliminary detection of toner coverage in the binding region before the binding process. If the toner coverage exceeds a predetermined threshold, the system preemptively executes image correction to reduce toner density in the binding area, ensuring that sufficient fiber exposure is available for reliable entanglement binding.
Solution Approach 2:
The system calculates the toner coverage ratio in the binding region and uses this feedback information to determine whether image correction is necessary. The correction amount is adjusted based on the detected toner coverage level, creating a closed-loop control system that optimizes binding reliability while minimizing image quality degradation.
2Reliability
If image correction is applied to reduce toner coverage in binding regions, then binding reliability is improved, but image quality deteriorates
Solution Approach 1:
The system applies image correction selectively only to the binding region where toner coverage exceeds the threshold, leaving other regions of the sheet unchanged. This localized approach ensures that binding reliability is improved without unnecessarily degrading the overall image quality of the document.
Solution Approach 2:
The system adjusts the toner coverage parameter in the binding region by a controlled amount, reducing it to fall within the optimal range for fiber entanglement. The correction magnitude is dynamically determined based on the initial toner coverage level, preventing excessive correction that would degrade image quality.
3Strength
If metal staples are used for binding, then binding strength is improved, but sheet damage and recyclability deteriorate
Solution Approach 1:
The system replaces the mechanical staple penetration method with a fiber entanglement mechanism. Toothed members press the sheets together to entangle fibers naturally, eliminating the need for metal staples that penetrate and damage sheet surfaces. This substitution maintains binding strength while preserving sheet integrity for recycling.
Solution Approach 2:
The invention eliminates the use of consumable metal staples entirely, replacing them with a reusable toothed binding mechanism. This removes the need for disposable fasteners that require removal during recycling, reducing both cost and environmental impact while maintaining adequate binding strength for document handling.
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 system reliably achieves stapleless binding by ensuring the toner coverage is minimized, enabling strong fiber entanglement and maintaining sheet quality while facilitating recyclability.
Implementation Method 1
the lower teeth and the upper teeth of the binding portion are engaged with each other to form depth-direction asperities in a part of the sheet bundle, thereby fibers of the overlapping sheets of the sheet bundle are entangled with each other to bind the sheet bundle
Data Source
AI summary
A toner image is formed on a sheet based on image data by an image forming portion, and a plurality of sheets on which the toner image is formed is bound together by a stapleless binding unit including a pair of tooth-like members, each having a concave and convex portion. Then, the image data is corrected by a correction portion so that a ratio of toner within a part of the sheet to be subjected to binding processing by the stapleless binding unit is equal to or smaller than a predetermined value.