Control Cylinder Ink Spreading and Duplex Handling
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Solution Overview
Problem
Ink jet marking devices using solid ink require separate serial subsystems for cooling, spreading, and duplex inversion of cut-sheets, which are costly, complex, and inefficient, especially when handling large substrate media.
Innovation Solution
An integrated apparatus with a control cylinder for thermal conduction, a pressure roll for spreading, and a modular design that combines cooling, spreading, and duplex inversion functions, allowing for adjustable dwell time and temperature control, and sensor-activated thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate serial subsystems are used for cooling, spreading, and duplex inversion, then each function can be performed independently, but the system becomes complex, costly, and inefficient
Solution Approach 1:
The patent merges cooling, spreading, and duplex inversion functions into a single integrated control cylinder assembly. The control cylinder performs thermal conduction for cooling while simultaneously serving as a spreading surface, and the entire assembly enables duplex inversion through rotational positioning. This consolidation eliminates the need for separate serial subsystems, reducing system complexity while maintaining processing efficiency.
Solution Approach 2:
The control cylinder is designed as a multi-functional component that simultaneously provides thermal conduction for cooling, a curved surface for ink spreading, and a rotational mechanism for duplex inversion. This universal component replaces multiple specialized subsystems, reducing overall system complexity while improving productivity through integrated operation.
2Ease of manufacture
If multiple separate subsystems are used, then each function can be optimized independently, but the cost and space requirements increase
Solution Approach 1:
By combining cooling, spreading, and duplex inversion into a single control cylinder assembly, the patent reduces the number of components that need to be manufactured and assembled. This integration lowers manufacturing costs and reduces the space required for the apparatus, as the functions are consolidated into one compact unit rather than requiring multiple separate subsystems.
3Manufacturing precision
If the pressure roll remains closed continuously, then ink spreading is continuous, but the sheet cannot pass through freely causing delays
Solution Approach 1:
The pressure roll is designed with dynamic positioning capability, allowing it to switch between closed and open positions. The roll closes to apply pressure for ink spreading when needed, then opens to allow sheets to pass through freely. This dynamic adjustment optimizes both ink spreading quality and sheet processing speed by matching the pressure roll position to the specific operational requirement at each moment.
Solution Approach 2:
The pressure roll operates in periodic cycles, closing to apply spreading pressure during ink application phases, then opening to allow rapid sheet passage during transport phases. This periodic action between closed and open states ensures high-quality ink spreading while maintaining high productivity through efficient sheet handling during the open phases.
4Speed
If the control cylinder rotates faster, then processing speed increases, but the dwell time for thermal conduction and leveling decreases
Solution Approach 1:
The control cylinder's rotational speed is made dynamically adjustable rather than fixed. This allows the system to optimize rotation speed based on specific operational requirements - faster speeds for high-volume processing when ink leveling is less critical, and slower speeds when high-quality ink leveling and thermal conduction are required. The dynamic speed control resolves the contradiction between speed and precision.
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 reduces costs and complexity by integrating functions into a compact, scalable system that efficiently handles large substrate media, improving image quality and reducing maintenance needs while enabling efficient duplex printing.
Implementation Method 1
a control cylinder rotatably supported for thermal conduction to a sheet of substrate media
Implementation Method 2
The pressure roll together with the control cylinder forms a spreader nip. The spreader nip is selectively changeable between a closed position and an open position. In the closed position the pressure roll is biased toward the control cylinder for applying pressure to the ink on the sheet.
Data Source
AI summary
An apparatus including a control cylinder rotatably supported for thermal conduction to a sheet. The sheet conveys ink deposited on a first side. The sheet is held against a peripheral arch of the control cylinder as it rotates with the first side of the sheet directly engaging and wrapping around the control cylinder along the peripheral arch. The apparatus also includes a thermal control element for heating and/or cooling the control cylinder. The apparatus also includes a pressure roll for spreading the ink. The pressure roll with the control cylinder forms a spreader nip, which is selectively changeable between a closed and open position. In the closed position the pressure roll is biased toward the control cylinder for applying pressure to the ink on the sheet. The pressure roll is spaced further away from the control cylinder in the open position relative to the closed position.