Skew Correction Rollers for Media Sheet Alignment
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Solution Overview
Problem
Image forming devices face misalignment issues with media sheets due to variability in loading and dimensional tolerances, leading to skewing and potential media jams, which current correction methods like forcing the leading edge against a gate or roller nip can delay the process and limit throughput.
Innovation Solution
A drive shaft with skew correction rollers spaced apart, where the media sheet contacts first and second skew correction rollers, and the drive shaft is rotated to align the media sheet with the media feed path, utilizing backup rollers to form nips and ensure proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the leading edge is forced against a gate or roller nip to correct misalignment, then alignment is improved, but the forward motion is delayed and throughput is limited
Solution Approach 1:
The skew correction rollers are positioned upstream in the media path to correct misalignment before the media sheet reaches the print area. By performing alignment earlier in the process, the system avoids delays that would occur if correction were attempted later at the gate or roller nip, thus maintaining throughput while achieving proper alignment.
Solution Approach 2:
The skew correction rollers act as an intermediary mechanism between the media sheet feed and the print area. These rollers gently guide and realign the media sheet through rotational adjustment without requiring the forceful engagement of gates or nips, thereby correcting alignment while minimizing disruption to the forward motion and maintaining throughput.
2Productivity
If misaligned media sheets are conveyed without correction, then throughput is maintained, but media jams and print defects occur
Solution Approach 1:
The skew correction rollers are positioned upstream to correct misalignment before the media sheet enters the critical print and transfer areas. By performing alignment earlier in the process, the system prevents jams and print defects that would occur with uncorrected misalignment, while minimizing disruption to throughput through gentle guidance rather than forceful correction.
Solution Approach 2:
The skew correction rollers utilize the natural forward motion of the media sheet to perform alignment. As the media sheet passes through the rollers, their rotational movement automatically guides the sheet into proper alignment without requiring additional force or stopping the conveyance, thereby maintaining throughput while preventing jams through self-correcting alignment.
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 corrects media sheet misalignment without causing delays, ensuring consistent alignment and reducing the likelihood of jams, thereby enhancing throughput and print quality.
Implementation Method 1
The media sheet contacts a first skew correction roller and then contacts a second skew correction roller. The drive shaft is then rotated, driving the second skew correction roller and aligning the media sheet to the media feed path.
Data Source
AI summary
Methods and devices for aligning a media sheet in a media feed path of an image forming device. One embodiment includes a drive shaft with skew correction rollers spaced apart on the drive shaft. The media sheet contacts a first skew correction roller and then contacts a second skew correction roller. The drive shaft is then rotated, driving the second skew correction roller and aligning the media sheet to the media feed path.