Adjustable Web Guard for Collision-Free Printing

Solution Overview

Problem

Existing web processing apparatuses face challenges in maintaining optimal print quality due to varying web thickness and flatness, as fixed side guards restrict movement and distance, leading to potential collisions and suboptimal image printing on thinner webs.

Innovation Solution

An apparatus with a detector and control unit that identifies and adjusts the position of a first guard connected to the support platen, allowing for dynamic adjustment of the processing station's movement to avoid collisions and optimize the processing distance based on the web's properties, using a first guard with a predefined gap spacing and optional second guard for different web properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the print station is arranged at a predetermined gap from the support plate to avoid collision with fixed side guards, then collision is prevented, but the processing distance increases for thin webs reducing print quality

Engineering Contradiction:

Improvecollision preventionVSAvoidprint quality

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The side guards are made adjustable in position relative to the support plate, allowing the gap between the print station and support plate to be dynamically changed based on web thickness. This resolves the contradiction by enabling the system to maintain both collision prevention and optimal print quality for different web types.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The position of the side guards can be changed to accommodate different web thicknesses. For thinner webs, the guards are positioned closer to reduce the required gap and improve print quality, while for thicker webs, the guards are positioned farther to prevent collision, thus adapting parameters to different operating conditions.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If fixed side guards are used to guide the web, then web guidance is provided, but the apparatus cannot accommodate varying web thickness and flatness

Engineering Contradiction:

Improveweb guidanceVSAvoidaccommodation of varying web properties

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The side guards are made adjustable in position relative to the support plate, allowing the gap between the print station and support plate to be dynamically changed based on web thickness. This resolves the contradiction by enabling the system to maintain both collision prevention and optimal print quality for different web types.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The position of the side guards can be changed to accommodate different web thicknesses. For thinner webs, the guards are positioned closer to reduce the required gap and improve print quality, while for thicker webs, the guards are positioned farther to prevent collision, thus adapting parameters to different operating conditions.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If the print station is moved closer to the support plate for thin webs to improve print quality, then print quality improves, but the risk of collision with side guards increases

Engineering Contradiction:

Improveprint qualityVSAvoidcollision risk

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The side guards are made adjustable in position relative to the support plate, allowing the gap between the print station and support plate to be dynamically changed based on web thickness. This resolves the contradiction by enabling the system to maintain both collision prevention and optimal print quality for different web types.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The position of the side guards can be changed to accommodate different web thicknesses. For thinner webs, the guards are positioned closer to reduce the required gap and improve print quality, while for thicker webs, the guards are positioned farther to prevent collision, thus adapting parameters to different operating conditions.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10589546B2Method for processing a web in an apparatus

Publication Date: 2020.03.17 CANON PRODN PRINTING HLDG BV

AI summary

A web printing apparatus comprising a support platen facing the processing station for supporting the web, when being processed by the processing station and a first guard for guarding a side edge of a web, the first guard being connectable to the support platen for guiding the web along a transport path, when the web is processed by the processing station. A detector is provided for detecting the first guard when connected to the support platen as well as a control unit configured for controlling the processing station to process the web, wherein the control unit is configured to identify the guard based on a detection signal provided by the detector to the control unit. Thereby, the first guard is identified by the control unit which may then control the movement of the print carriage to avoid the first guard, preventing collisions.