Inkjet Recording Head Cooling via Branch Flow Control
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Solution Overview
Problem
Inkjet recording apparatuses face issues with temperature variations in recording heads, leading to uneven image density and ink discharge errors, as IC chips malfunction at high temperatures, necessitating a reliable cooling mechanism to maintain temperature consistency.
Innovation Solution
The apparatus incorporates a cooling mechanism with a circulation path, heat dissipating portion, and pump for each line head, using a control system to adjust the flow of cooling liquid based on temperature detection, focusing on recording heads predicted to undergo temperature rises, ensuring efficient cooling of only the necessary heads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a cooling mechanism is provided for each line head to maintain temperature consistency, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The cooling mechanism is segmented by providing separate cooling systems for each line head (cyan, magenta, yellow, black) instead of a single centralized cooling system. Each line head has its own circulation path with independent control, allowing precise temperature management for each color channel while maintaining modular architecture that limits overall system complexity.
Solution Approach 2:
The patent implements local quality control by detecting temperatures individually at each line head location and adjusting cooling flow rates specifically for each head based on its thermal state and printing workload. This localized approach optimizes temperature control precision without requiring all cooling systems to operate at maximum capacity simultaneously, thereby managing device complexity.
2Temperature
If cooling liquid flow rate is increased to cool recording heads, then temperature control is improved, but energy consumption increases
Solution Approach 1:
The cooling system employs dynamic flow rate adjustment where the cooling liquid flow rate for each line head is varied in real-time based on detected temperature conditions and printing workload. The flow rate increases when temperature rises or printing intensity increases, and decreases when cooling demand is low, optimizing the balance between temperature control and energy consumption.
Solution Approach 2:
Temperature detection units continuously monitor the thermal state of each recording head and provide feedback to the control unit, which adjusts the cooling liquid flow rate accordingly. This closed-loop feedback mechanism ensures that energy is consumed only when and where needed, preventing unnecessary energy waste while maintaining precise temperature control.
3Stability of the object's composition
If cooling is applied to all recording heads simultaneously, then temperature uniformity is improved, but productivity decreases due to extended cooling time
Solution Approach 1:
The cooling system applies partial action by directing cooling liquid flow selectively to only those line heads that require cooling at any given moment, rather than cooling all heads simultaneously. The control unit determines which heads need cooling based on temperature detection and printing workload, applying cooling precisely where needed and reducing overall cooling time to maintain productivity.
Solution Approach 2:
The system performs preliminary temperature detection and prediction before full printing operations begin, allowing the control unit to pre-adjust cooling flow rates to anticipated temperature conditions. This preliminary action prevents temperature deviations before they occur, reducing the need for extended cooling periods and maintaining printing efficiency.
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 maintains the temperature of recording heads within a constant range, preventing ink discharge errors and ensuring consistent image quality by individually targeting and cooling recording heads based on predicted temperature rises, thereby improving printing efficiency and productivity.
Implementation Method 1
The circulation path... receives heat of the recording heads by means of the cooling liquid circulating therein
Implementation Method 2
The heat dissipating portion... dissipates heat of the cooling liquid
Data Source
AI summary
An inkjet recording apparatus includes a conveying portion, a recording portion including a line head including a plurality of recording heads, a temperature detecting portion, a cooling mechanism, and a control portion. The cooling mechanism includes a storing portion that stores cooling liquid, a circulation path of the cooling liquid that is arranged to be branched into a plurality of branch paths passing near the recording heads, a heat dissipating portion that dissipates heat of the cooling liquid, and a pump that causes the cooling liquid to circulate. If there exists, among the recording heads, a recording head that is predicted to undergo a temperature rise, the control portion increases a flow amount or circulation time of the cooling liquid in whichever of the branch paths serves as a flow path of the cooling liquid flowing toward the recording head that is predicted to undergo a temperature rise.