Pivotable Inkjet Printing Device for Offset Press Maintenance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sheet-fed printing presses with integrated printing formeless devices require multiple units and increased investment due to the need for permanent installation of printing formeless devices at every relevant position, complicating handling and maintenance.
Innovation Solution
A displaceable and pivotable inkjet printing device is integrated into the printing press, allowing it to be moved away from the cylinder and coating devices, equipped with shielding to prevent stray radiation from dryers and featuring a pivoting mechanism for maintenance and cleaning, enabling efficient operation and reduced investment costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a formless printing unit is permanently integrated into the sheet-fed printing press at every relevant position, then printing functionality is ensured at all positions, but investment costs increase and device complexity increases
Solution Approach 1:
The inkjet printing device is designed to be displaceable and pivotable rather than permanently fixed, allowing it to dynamically change position between working position (for printing) and storage position (for maintenance and to clear path). This dynamic design reduces the need for multiple permanently integrated units while maintaining printing functionality where needed.
Solution Approach 2:
The single inkjet printing device serves multiple functions by being movable to different positions and can perform both printing operations and facilitate maintenance of coating devices. The shielding device also serves dual purposes: protecting during operation and enabling maintenance access.
2Reliability
If a formless printing unit is permanently integrated into the sheet-fed printing press, then printing functionality is ensured, but handling and maintenance become more difficult
Solution Approach 1:
The displaceable and pivotable design of the inkjet printing device allows operators to easily move it from the working position to the storage position, simplifying maintenance access to coating devices and improving operational flexibility without compromising printing functionality.
Solution Approach 2:
The inkjet printing device is designed as a separate, modular unit that can be independently positioned and maintained, rather than being permanently integrated into the press structure. This segmentation facilitates easier handling and maintenance.
3Productivity
If the inkjet printing device is positioned close to the drying unit, then printing efficiency is improved, but stray radiation contaminates the inkjet print head
Solution Approach 1:
A shielding device is introduced as an intermediary element between the drying unit and the inkjet print head. This shield blocks stray radiation from reaching the print head while allowing the device to remain positioned for efficient printing operations.
Solution Approach 2:
The harmful effect of stray radiation is extracted or removed from the system by using the shielding device to block and isolate the radiation, preventing it from affecting the inkjet print head while maintaining close positioning for 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 simplifies handling and maintenance, reduces investment requirements, and ensures high-quality inkjet printing by allowing the inkjet device to be positioned precisely and efficiently within the printing unit, while preventing inkjet print head contamination and improving print quality.
Implementation Method 1
an inkjet head with a nozzle surface (5.1) in which inkjet nozzles (5) are arranged
Implementation Method 2
The wiper element, wrapped around the pressure roller, is pressed against the nozzle surface
Implementation Method 3
dried using different methods (UV radiation, infrared radiation, electron beam, hot air, etc.)
Implementation Method 4
dried using different methods (UV radiation, infrared radiation, electron beam, hot air, etc.)
Implementation Method 5
dried using different methods (UV radiation, infrared radiation, electron beam, hot air, etc.)
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The invention relates to a device for printing printed sheets by means of one or more inkjet print heads (5) in a printing unit (1) on a sheet-guiding impression cylinder (2) in a sheet-fed printing press having several printing units. According to the invention, a pivoting mechanism in the region between the surface of the impression cylinder (2) and a parking position is associated with the or each inkjet print head (5) within a printing unit (1). The pivoting mechanism is designed as a parallel guide, wherein the inkjet print head (5) is moved by the surface of the impression cylinder (2) at a distance from a coating unit in the printing unit (1).