Toner Sheet Bonding Control for Variable Stack Thickness

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing sheet bonding technologies impose an upper limit on the number of sheets that can be bonded, leading to potential jams and processing failures due to varying sheet thickness and curling issues.

Innovation Solution

A sheet processing apparatus that measures actual sheet thickness and adjusts bonding processing dynamically, without pre-setting the number of sheets, using toner as an adhesive and employing a bonding unit that applies heat and pressure to align and bond sheets based on real-time thickness measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an upper limit is set on the number of sheets to be bonded, then processing reliability is improved, but device flexibility and adaptability deteriorate

Engineering Contradiction:

Improveprocessing reliabilityVSAvoiddevice flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic adjustment of bonding processing based on real-time thickness measurements. The system continuously monitors the actual thickness of sheets during bonding and adjusts bonding parameters (such as bonding pressure, temperature, and time) dynamically. This allows the system to adapt to varying sheet thicknesses without pre-setting upper limits on the number of sheets, thereby maintaining both reliability and flexibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs feedback mechanisms where thickness measurement units continuously measure the actual thickness of sheets during the bonding process. These measurements are fed back to control units that adjust bonding parameters accordingly. This closed-loop feedback system enables the apparatus to handle variable numbers of sheets reliably by adapting to actual conditions rather than relying on pre-defined limits.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If bonding processing is performed without pre-setting sheet number limits, then device flexibility is improved, but processing reliability deteriorates due to potential jams and curling issues

Engineering Contradiction:

Improvedevice flexibilityVSAvoidprocessing reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent performs preliminary thickness measurements of sheets before bonding processing begins. The thickness measurement unit measures the actual thickness of sheets in advance, and this information is used to pre-adjust bonding parameters. This preliminary action prevents potential jams and curling issues from occurring during bonding, thereby maintaining reliability while allowing flexible operation without pre-set sheet number limits.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces traditional mechanical limits (physical constraints on sheet number) with a measurement-based control system. Instead of relying on mechanical structures that physically limit the number of sheets, the system uses thickness measurement units and control units to dynamically adjust bonding parameters. This substitution of mechanical constraints with intelligent control maintains reliability while enabling greater flexibility.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If fixed bonding parameters are used for all sheet thicknesses, then device complexity is reduced, but manufacturing precision and bonding quality deteriorate

Engineering Contradiction:

Improvedevice complexityVSAvoidbonding quality

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent dynamically changes bonding parameters (temperature, pressure, time) based on actual sheet thickness measurements. Instead of using fixed parameters for all sheet types, the system adjusts parameters according to the measured thickness of each sheet or bundle. This parameter change approach maintains relatively simple device architecture while significantly improving bonding quality and precision for different sheet thicknesses.

Inventive Principle:

Principle #35Parameter changes

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

Prevents jams by dynamically adjusting bonding processes based on actual sheet thickness and curling, ensuring reliable bonding without pre-defined limits, enhancing usability and efficiency.

Implementation Method 1

applying heat and pressure to the sheets in a state where the sheets overlap one another

Methodology Applied

Scientific EffectHeat and pressure application:

Implementation Method 2

toner is used as an adhesive

Methodology Applied

Scientific EffectAdhesive bonding: Adhesive

Data Source

PatentEP4686577A1Sheet processing apparatus that bonds plurality of sheets together, and image forming system

Publication Date: 2026.02.04 CANON KK

Figure 1
Figure 2
Figure 3A~3C

AI summary

A sheet processing apparatus (4), comprising: conveyance means (115) configured to convey a sheet to a loading board; bonding means (61) configured to execute bonding processing for bonding together a plurality of loaded sheets loaded on the loading board, with use of an adhesive image formed on the plurality of loaded sheets; and control means (101) configured to control the bonding processing executed by the bonding means (61) in order to create a bundle of sheets from a designated number of sheets designated by a job, wherein the control means (101) is further configured not to execute the bonding processing with respect to the plurality of loaded sheets in a case where a thickness of the plurality of loaded sheets exceeds a first threshold.