Conveying Apparatus Guide Engagement for Sheet Jam Prevention
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Solution Overview
Problem
Conventional conveying apparatuses often fail to appropriately guide sheets to the nip position where the conveying roller and pinch roller nip the sheet, leading to potential sheet jams due to inadequate guidance.
Innovation Solution
The apparatus includes a rotation shaft with a conveying roller and a driven roller, supported by a bearing and guided by first and second guide members with U-shaped recesses that engage the rotation shaft, ensuring proper alignment and guidance of the sheet to the nip position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the inner guide member is only positioned to the frame without engagement to the rotation shaft, then the structure is simpler, but the sheet guidance becomes inadequate causing sheet jams
Solution Approach 1:
The inner guide member is merged with the rotation shaft through engagement portions that directly connect to grooves on the rotation shaft. This integration ensures that the inner guide member moves synchronously with the rotation shaft, providing stable and accurate sheet guidance to the nip position, thereby preventing sheet jams while maintaining structural simplicity.
2Reliability
If the conveying roller and pinch roller nip the sheet with stable force, then the conveyance is smooth, but the sheet must be precisely guided to the nip position which requires complex positioning
Solution Approach 1:
The outer guide member and inner guide member are merged into an integrated guide structure where the inner guide member is engaged with the rotation shaft. This unified structure automatically maintains the correct positional relationship between the guides and the nip position, ensuring stable nipping force without requiring complex independent positioning systems.
Solution Approach 2:
The engagement portions on the rotation shaft with grooves enable the inner guide member to self-position and self-adjust relative to the rotation shaft. This self-service mechanism ensures that the guide members automatically maintain their correct positions as the rotation shaft rotates, providing consistent sheet guidance and stable nipping force without external intervention.
Data Source
AI summary
A conveying apparatus includes: a rotation shaft; a conveying roller secured to the rotation shaft; a driven roller that cooperates with the conveying roller to convey a sheet at a nip position; a supporter supporting the rotation shaft rotatably; and a first guide and a second guide opposed to each other and defining a conveyance path guiding the sheet toward the nip position. The first guide and the second guide respectively have first and second guide surfaces defining the conveyance path. The first guide and the second guide respectively have first and second engaging portions engaged with the rotation shaft at positions different from a position of the supporter in the axial direction of the rotation shaft.