Pivotable Louvers for Dryer Safety in Large Printers
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Solution Overview
Problem
In large-scale, high-volume printing applications, especially ink-jet printing, there is a need for a safety system to prevent direct contact between the printing web and high-temperature or radiation elements, particularly during jams or anomalous conditions, while also allowing for controlled exposure to convection heat or airflow.
Innovation Solution
A dryer system with pivotably movable louvers positioned between lamp mounts and the sheet path, which can be electrically actuated to cover or uncover the lamps, ensuring safety and controlling airflow or heat exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heating or radiation elements are exposed to the sheet path, then drying efficiency is improved, but safety risks increase during jams or anomalous conditions
Solution Approach 1:
The louvers are made pivotably movable about an axis, allowing dynamic adjustment between open and closed positions. This enables the system to adapt the exposure of heating elements based on operational conditions, maintaining safety while preserving drying efficiency when needed.
Solution Approach 2:
The louvers serve as an intermediary element positioned between the heating/radiation elements and the sheet path. They can be actuated to cover the heating elements during safety concerns while allowing controlled exposure for convection heat or airflow when safe, mediating between safety requirements and drying functionality.
2Object-affected harmful factors
If the heating elements are covered for safety, then safety is improved, but drying functionality is reduced
Solution Approach 1:
The pivotable louver mechanism allows the system to dynamically switch between safety-mode (covered) and functionality-mode (exposed). The dynamic positioning capability ensures that the system can respond to operational needs, maintaining drying functionality when safe and providing protection when necessary.
Solution Approach 2:
The system changes the exposure parameter of the heating elements through louver positioning. By adjusting the open/closed state of the louvers, the system modifies the degree of exposure from 0% (fully covered for safety) to 100% (fully exposed for drying), allowing optimization based on operational conditions.
3Object-affected harmful factors
If louvers are added to control safety and airflow, then safety and operational flexibility are improved, but device complexity increases
Solution Approach 1:
The drying system is segmented into functional zones with individual louver controls positioned at specific locations along the sheet path. Each louver operates independently to control exposure of specific heating elements, allowing modular safety management without requiring a completely complex reconfiguration of the entire drying system.
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
The system effectively prevents direct contact between the printing web and hot elements during malfunctions and allows for controlled heat or airflow management, enhancing safety and operational flexibility in high-speed printing processes.
Implementation Method 1
These systems very often will apply high temperatures or radiation, such as infrared, to the sheet or web
Implementation Method 2
there may be reasons for controllably uncovering a heating or radiation element relative to the sheet, such as to control convection heat or other airflow within the apparatus
Data Source
AI summary
A printing apparatus, such as a large-scale ink jet printer, includes a drying module having a set of lamps disposed near a sheet path. A set of louvers can be positioned so that a portion of each louver can be interposed between the lamps and a sheet path. In one embodiment, the lamps are held by a set of lamp mounts, and each louver is pivotable around one lamp mount. In one embodiment, the louvers cover the lamps in response to a detected condition within the printer, such as a sheet jam or high temperature.