Media Lifting Strip for Belt Printer Edge Control
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Solution Overview
Problem
Belt printing systems face challenges in printing on thin media due to the gap between the media transport belt and the blocking device, which can cause unintended entry into the print zone, leading to print quality issues and mechanical damage.
Innovation Solution
A media lifting device with a clamp and media lifting strip is integrated into the printing system to raise the lateral edges of the media, ensuring they interface with the blocking device and preventing accidental entry into the print zone, while allowing the media to pass through when the blocking device is raised.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap between the media transport belt and the blocking device is maintained for thin media, then the media can pass through during printing, but the media may accidentally enter the print zone causing print quality issues and mechanical damage
Solution Approach 1:
A media lifting device is introduced as an intermediary component between the media transport belt and the blocking device. This device temporarily raises the media during non-printing phases to ensure proper interface with the blocking device, then lowers it during printing to allow smooth passage, thus mediating between the conflicting requirements of blocking and allowing media passage
Solution Approach 2:
The media lifting device is made dynamically adjustable, changing its lifting action based on the printing phase. During non-printing phases, it raises the media to prevent unintended entry; during printing phases, it lowers the media to allow passage. This dynamic adjustment resolves the contradiction by adapting the blocking mechanism to different operational states
2Reliability
If the blocking device is lowered to prevent media entry, then print quality is maintained, but thin media cannot pass through the gap
Solution Approach 1:
The system dynamically switches between two states: during non-printing phases, the media lifting device is activated to raise thin media for proper blocking; during printing phases, the lifting device is deactivated to allow media passage. This temporal separation of functions enables both print quality maintenance and productivity on thin media
Solution Approach 2:
The media lifting device operates periodically, alternating between lifting and non-lifting states synchronized with the printing cycle. This periodic action ensures that media is blocked only when necessary (during non-printing phases) while allowing continuous passage during printing phases, thus maintaining both quality and productivity
3Productivity
If the media transport belt operates continuously for high productivity, then printing efficiency increases, but thin media may accidentally enter the print zone
Solution Approach 1:
The system incorporates feedback control through sensors that detect the position and thickness of media. This feedback information is used to control the media lifting device, ensuring it activates only when thin media is detected and the system is in a non-printing phase, thus maintaining precise media control while allowing continuous operation for high productivity
Solution Approach 2:
The media lifting device performs preliminary action by raising the media in advance during non-printing phases, before the media could potentially enter the print zone unintentionally. This proactive measure prevents errors before they occur, enabling continuous high-speed operation with maintained reliability
Data Source
AI summary
In one example in accordance with the present disclosure, a media lifting device is described. The media lifting device includes a media lifting strip to sit on a media transport belt of a printing system. The media lifting strip is to raise a lateral edge of incoming media. That lateral edge of incoming media is a portion of the incoming media that is parallel to a media travel direction. The media lifting device also includes a clamp to affix the media lifting strip to the printing system.