Sheet Conveying Shutter Radius Matching for Skew Correction
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Solution Overview
Problem
Conventional sheet conveying apparatuses fail to adequately correct skew in thin sheets due to local deformation, which degrades the precision of skew feed correction, especially in sheets with a basis weight less than 60 g/m².
Innovation Solution
A sheet conveying apparatus with a shutter portion and guide portion, where the shutter portion is rotatably supported on a rotary shaft of a conveying roller, guiding the leading edge of the sheet to the nip portion after it abuts against the shutter portion, and a guide portion with the same radius as the second conveying roller, ensuring the leading edge is aligned straight for effective skew correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional sheet conveying apparatus with a restraining member is used for skew feed correction, then the leading edge of the sheet can be aligned in parallel to correct skew, but local deformation occurs in thin sheets causing the leading edge to become bent and degrading skew feed correction precision
Solution Approach 1:
The invention changes the geometric parameters of the shutter portion by providing a same radius portion with substantially the same radius as the conveying roller. This parameter matching ensures that the shutter portion rotates in coordination with the conveying roller, preventing differential motion that causes local deformation and maintaining leading edge straightness during skew feed correction
Solution Approach 2:
The invention applies curvature by designing the shutter portion with a same radius portion that has substantially the same radius as the conveying roller. This curved geometry allows the shutter portion to follow the rotational path of the conveying roller, ensuring smooth coordination and preventing the leading edge from becoming bent during the skew feed correction process
2Manufacturing precision
If the shutter portion is rotated to guide the leading edge to the nip portion for skew correction, then skew feed correction is achieved, but local deformation occurs in thin sheets reducing correction accuracy
Solution Approach 1:
The invention changes the radius parameter of the shutter portion to match the conveying roller radius. This parameter alignment ensures that both components rotate in unison, maintaining consistent coordination during the skew feed correction process and preventing the leading edge from becoming misaligned or deformed, thereby improving both correction accuracy and reliability
Solution Approach 2:
The invention applies dynamics by making the shutter portion rotatable about the rotary shaft of the conveying roller. This dynamic configuration allows the shutter portion to automatically follow the rotational motion of the conveying roller, ensuring continuous coordination during sheet conveyance and skew correction without causing leading edge deformation or misalignment
Data Source
AI summary
A sheet conveying apparatus including: a conveying roller pair conveying a sheet by a nip portion; a shutter portion which is rotatably supported on a rotary shaft of the first conveying roller; a same radius portion, provided in the shutter portion, which is formed to have substantially the same radius as a radius of the first conveying roller; an abutment portion, provided in the shutter portion, and against which the leading edge of the sheet is abutted; and a boundary portion, provided in a boundary of the abutment portion and the same radius portion, which guides the leading edge of the sheet to the nip portion when the shutter portion is rotated by abutting the leading edge of the sheet against the boundary portion.