Heating Roller Temperature Control for Recording Media Width Adaptability
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Solution Overview
Problem
Existing drying devices face challenges in suppressing temperature increases at non-sheet passing parts, especially when handling recording media of varying widths, as they require multiple heating sources and regions to maintain efficient drying without overheating.
Innovation Solution
A drying device with a roller incorporating two heating sources and temperature detectors to control heating, where a heating controller terminates heating by one source if the temperature of either region exceeds a predetermined level, ensuring balanced heat distribution and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple heating sources and heating regions are provided to correspond to various recording media widths, then drying performance for different media sizes is improved, but temperature control complexity and device complexity increase
Solution Approach 1:
The heating roller is divided into multiple heating regions (first heating region, second heating region, third heating region) with separate heating sources, allowing independent temperature control of each region. This segmentation enables the system to handle various recording media widths effectively by activating only the necessary heating regions, thus improving adaptability while maintaining manageable complexity through modular control.
2Productivity
If heating is applied to the entire roller surface, then drying efficiency is improved, but temperature increase at non-sheet passing parts becomes excessive
Solution Approach 1:
Different regions of the heating roller are assigned different heating control strategies. The first heating region (corresponding to non-sheet passing part) uses a first heating source with independent temperature detection and control, while the second and third heating regions (corresponding to sheet passing parts) use second and third heating sources. This local quality approach allows efficient drying at sheet passing parts while preventing excessive temperature rise at non-sheet passing parts.
Solution Approach 2:
Temperature sensors are installed in each heating region to detect local temperatures, and the control unit adjusts heating power based on feedback from these sensors. When the temperature at a non-sheet passing part exceeds a predetermined threshold, the control unit reduces or stops heating in that specific region, thereby maintaining drying efficiency at sheet passing parts while preventing overheating at non-sheet passing parts.
3Manufacturing precision
If heating sources are allocated according to paper sizes, then temperature control precision is improved, but the system becomes difficult to adapt to various recording media widths
Solution Approach 1:
The heating control system is designed to be dynamic rather than fixed. The control unit can selectively activate different combinations of heating sources (first, second, and third heating sources) based on the actual recording media width being processed. This dynamic adaptability allows the system to maintain precise temperature control for each heating region while accommodating various recording media widths, overcoming the limitation of fixed paper-size-based allocation.
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
This solution effectively suppresses temperature increases at non-sheet passing parts, ensuring consistent drying performance across various recording media widths without the need for width-dependent sensor configurations or additional heating sources, thus maintaining print quality and reducing costs.
Implementation Method 1
a first heating source and a second heating source that are included inside the roller... for drying a recording medium conveyed by rotation of the roller
Implementation Method 2
a first temperature detector configured to detect a temperature of a first region on a surface of the roller... a second temperature detector configured to detect a temperature of a second region on the surface of the roller
Data Source
AI summary
A drying device includes a roller, and the drying device is for drying a recording medium conveyed by rotation of the roller. The drying device includes a first heating source and second heating source included inside the roller; first and second temperature detectors for respectively detecting a temperature of a first region on a surface of the roller and a temperature of a second region on the surface of the roller; and a heating controller that controls heating and termination of the heating by the first heating source and/or the second heating source, wherein, upon detecting that a temperature of one region of the first region and the second region is higher than or equal to a predetermined temperature, the heating controller terminates heating by one heating source corresponding to the other region.