Printing Apparatus With Sacrificial Idler Rollers for Tension Detection
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Solution Overview
Problem
Conventional printing apparatuses face challenges in identifying deformed idler rollers under excessive tension, leading to prolonged downtime and potential deformation of important rollers, especially those used for encoders.
Innovation Solution
Incorporation of sacrificial rollers that are more deformable than other idler rollers, positioned near the inlet and outlet, allowing easy identification and replacement, and a tension sensor to detect deformation through frequency analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple idler rollers are used to transport the print medium, then the transport stability is improved, but it becomes difficult to identify deformed rollers among the multiplicity of rollers
Solution Approach 1:
The patent designates at least one idler roller as a sacrificial roller that is more deformable than other rollers. This sacrificial roller is intentionally made to deform first under excessive tension, serving as a disposable component that protects more important rollers. The sacrificial roller can be easily identified and replaced when deformed, solving the identification problem while maintaining transport stability through the presence of multiple rollers.
2Reliability
If important idler rollers such as encoder rollers are protected from deformation, then the reliability is improved, but it requires a mechanism to prevent deformation under excessive tension
Solution Approach 1:
The patent introduces a sacrificial roller as an intermediary component between the print medium and the important idler rollers. This sacrificial roller absorbs excessive tension and deformation that would otherwise be transmitted to critical rollers like encoder rollers. By placing this intermediate protective element in the tension path, the system protects important rollers without requiring complex active protection mechanisms.
3Extent of automation
If the print medium is transported through multiple rollers, then the transport control is improved, but the downtime increases when a roller becomes deformed
Solution Approach 1:
The patent extracts the deformation detection function from the general population of rollers and concentrates it in the sacrificial roller. By designating specific rollers as sacrificial and more deformable, the system separates the detection function into a single identifiable component. When deformation occurs, operators only need to check the sacrificial roller rather than inspecting all rollers, dramatically reducing identification time and downtime while maintaining automated transport control.
Data Source
AI summary
There is provided a technique capable of easily identifying a deformed idler roller when strong tension is applied to a print medium and of suppressing the deformation of some important idler rollers. A printing apparatus includes a transport mechanism having multiple idler rollers. At least one of the idler rollers is a sacrificial roller that is more deformable than the other idler rollers. When strong tension is applied to the print medium, the sacrificial roller becomes deformed in preference to the other idler rollers. This allows the deformed idler roller to be easily identified, and suppresses the deformation of the idler rollers other than the sacrificial roller.