Inkjet Printer Center Pinch Roller Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional inkjet printers with cutting heads face issues in maintaining consistent image quality across the recording medium due to positional shifts during printing and cutting operations, as the center pinch roller can interfere with the printed surface when returning to the printing start position.
Innovation Solution
The design incorporates a movable center pinch roller that can be independently separated from the recording medium, combined with a rotatable holding shaft and eccentric cams, allowing precise control over the pinch rollers' position relative to the driving rollers to prevent positional shifts and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the center pinch roller is lifted to avoid the recording medium during return to printing start position, then the recording medium can be repositioned without image damage, but the structure becomes more complex and the operation less stable
Solution Approach 1:
The holding shaft is made rotatable to dynamically adjust the position of pinch rollers. By rotating the holding shaft, the pinch rollers can be positioned to contact or separate from the recording medium based on operational requirements, providing flexible control without complex lifting mechanisms
Solution Approach 2:
The holding shaft serves multiple functions: it holds both side pinch rollers and center pinch roller, enables their positional adjustment through rotation, and allows coordinated or independent movement of different pinch rollers. This multi-functionality reduces overall system complexity while maintaining reliability
2Manufacturing precision
If the center pinch roller is lifted independently from side pinch rollers during cutting operation, then the recording medium can move reciprocatingly without positional shift, but the control mechanism becomes more complex
Solution Approach 1:
The holding shaft can rotate to independently position the center pinch roller relative to side pinch rollers. This dynamic adjustment allows the center pinch roller to be separated during cutting operations while side pinch rollers remain in position, achieving precise control through a single rotational degree of freedom
Solution Approach 2:
The system segments the control of different pinch rollers by allowing independent positioning through holding shaft rotation. The center pinch roller can be selectively engaged or disengaged from the recording medium while side pinch rollers maintain continuous contact, enabling precise operational control
3Reliability
If multiple pinch rollers are used to hold the recording medium during printing, then image quality consistency is improved, but the device structure becomes more complex
Solution Approach 1:
A single holding shaft performs multiple functions by holding both side pinch rollers and center pinch roller. This unified structure simplifies the overall device while enabling coordinated control of multiple rollers to maintain recording medium stability during printing operations
Solution Approach 2:
The holding shaft merges the support function for multiple pinch rollers into a single structural element. By combining the support of side and center pinch rollers on one shaft, the system reduces structural complexity while maintaining the benefits of multiple contact points for improved image quality consistency
Data Source
AI summary
A printer includes a first holding shaft holding side pinch rollers and at least one center pinch roller, grit rollers moving a recording medium while holding the recording medium together with the side pinch rollers and together with the center pinch roller, and a rotator rotating the first holding shaft to cause the side pinch rollers and the center pinch roller to approach, or to be separated from, the grit rollers. The center pinch roller is movable in a direction to be separated from the recording medium, independently from the side pinch rollers.