Transfer Belt Profile Calculation for Print Quality

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Solution Overview

Problem

Existing printing systems face shot deviations due to irregularities in transfer belt thickness and roller eccentricity, leading to suboptimal print quality, as previous methods fail to accurately calculate belt profile data due to inclusion of eccentricity fractions in average travel speed calculations.

Innovation Solution

A printing system with a measuring element to track travel distances or speeds at specific intervals, a roller profile calculator to isolate eccentricity fractions, and a belt profile calculator to remove these fractions, allowing for accurate belt profile data generation and controlled ink discharge timing based on corrected data.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If average travel speed is calculated from measurement data including roller eccentricity fractions, then the calculation process is simple, but the belt profile data becomes inaccurate

Engineering Contradiction:

Improvesimplicity of calculation processVSAvoidaccuracy of belt profile data

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent segments the measurement data into two distinct components: roller eccentricity fractions and belt thickness irregularities. By separating these components through sequential calculation steps (first calculating roller profile data, then using it to correct belt profile data), the system achieves accurate belt profile measurement while maintaining a structured, manageable calculation process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary calculation of roller profile data before calculating belt profile data. This preliminary action removes the roller eccentricity fractions from the measurement data first, ensuring that the subsequent belt profile calculation is based on corrected data, thereby preventing contamination of belt profile data with roller eccentricity errors.

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If roller eccentricity fractions are not removed from measurement data, then the calculation process is simpler, but shot deviations cannot be sufficiently suppressed

Engineering Contradiction:

Improvecomplexity of data processingVSAvoideffectiveness in suppressing shot deviations

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent extracts and isolates the roller eccentricity fractions from the total measurement data through dedicated calculation steps. By taking out this disturbing component first (calculating roller profile data separately), the system obtains clean measurement data for belt profile calculation, thereby achieving reliable suppression of shot deviations without excessive complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system performs the preliminary action of removing roller eccentricity fractions before using the data for belt profile calculation and ink discharge timing control. This sequential approach ensures that the belt profile data used for suppressing shot deviations is not contaminated by roller eccentricity effects.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If belt profile data includes roller eccentricity contamination, then data collection is straightforward, but ink discharge timing control becomes inaccurate

Engineering Contradiction:

Improvesimplicity of data collectionVSAvoidprecision of ink discharge timing

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent performs preliminary processing of the collected measurement data to separate roller eccentricity fractions from belt thickness irregularities. This preliminary calculation step ensures that the belt profile data used for ink discharge timing control is accurate, while the initial data collection process remains straightforward.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the ink discharge timing control process into two stages: first using roller profile data to compensate for roller eccentricity, then using corrected belt profile data to compensate for belt thickness irregularities. This segmentation ensures precise ink discharge timing while maintaining simple data collection procedures.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8851605B2Image formation apparatus utilizing a transfer belt

Publication Date: 2014.10.07 RISO KAGAKU CORP

AI summary

An LDV meter 21 cooperates with an LDV processor 22 to measure travel distances or travel speeds of a transfer belt at a prescribed measuring spot and at intervals with a prescribed rotation angle of one of a set of rollers, on which the transfer belt is stretched, as a set for one or more go-around revolutions of the transfer belt. A roller profile calculator 242 calculates a roller profile data as a set of fractions attributable to an eccentricity of the set of rollers in a set of measurement data. A belt profile calculator 241 removes the set of fractions attributable to the eccentricity from the set of measurement data and calculates a belt profile data representative of irregularities in thickness of the transfer belt based on the set of measurement data after removal of the set of fractions attributable to the eccentricity. In printing, a printing machine 1 controls timing for discharge of ink at an ink head based on the belt profile data and the roller profile data.