Cooling Unit for Image Forming Apparatus Sheet Blocking
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Solution Overview
Problem
In image forming apparatuses, consecutive printing of sheets leads to sheet blocking due to heat-induced toner re-fusion, causing sheets to adhere to each other, which existing technologies fail to adequately prevent.
Innovation Solution
The apparatus incorporates an air blower with adjustable airflow that blows air through air holes on the output tray's loading surface, cooling the sheets and preventing adhesion, activated when a threshold number of sheets or ambient temperature is reached, and also uses an exhaust fan to prevent toner fixation in cartridges during post-processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If consecutive printing is performed to increase productivity, then productivity is improved, but sheet blocking occurs due to heat-induced toner re-fusion
Solution Approach 1:
The patent converts the harmful heat generated during consecutive printing into a beneficial cooling process by introducing a cooling unit that blows air onto the recording medium surface. The same heat that causes toner re-fusion and sheet blocking is now managed through active cooling, allowing continuous high-speed printing while preventing sheet adhesion through controlled air flow cooling.
2Reliability
If cooling air flow is increased to prevent sheet blocking, then sheet separation is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of the cooling air flow based on real-time temperature detection. A temperature detection unit monitors the recording medium surface temperature, and a control unit adjusts the cooling unit's air flow accordingly. This dynamic adjustment ensures sufficient cooling to prevent sheet blocking while minimizing power consumption by reducing air flow when cooling is less critical.
3Reliability
If cooling is applied to prevent sheet blocking, then sheet separation is improved, but toner may become unfixed in cartridges
Solution Approach 1:
The patent applies cooling locally and selectively to the recording medium surface after image formation, rather than cooling the entire apparatus uniformly. The cooling unit is positioned to blow air specifically onto the output recording medium, while exhaust fans handle air circulation in other areas. This localized cooling approach prevents sheet blocking at the output tray without causing toner defixation in the cartridges, as each area receives appropriate thermal management.
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
Effectively prevents sheet blocking by cooling the sheets and reducing toner fixation in cartridges, ensuring proper sheet accommodation and reducing power consumption by controlling airflow based on sheet count and temperature.
Implementation Method 1
a cooling unit that allows air to flow between an interior of the housing and the loading section via the air hole so as to cool a surface, which faces the loading section, of the recording medium loaded on the loading section
Data Source
AI summary
An image forming apparatus includes a housing; an image forming section that is provided within the housing and forms an image onto a recording medium; an output section that outputs the recording medium, having the image formed thereon by the image forming section, outward from the housing; a loading section on which the recording medium output from the output section is loaded and that is provided with an air hole; and a cooling unit that allows air to flow between an interior of the housing and the loading section via the air hole so as to cool a surface, which faces the loading section, of the recording medium loaded on the loading section.