Sheet Transport Device Axial Skew Reduction
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Solution Overview
Problem
Existing sheet transport devices face challenges in reducing skewing or distortion of sheets as they pass through pairs of transport rollers, particularly when moving in an axial direction, leading to potential transportation failures and incorrect image formation on the sheet.
Innovation Solution
A sheet transport device with pairs of movable transport rollers that can move in an axial direction, accompanied by pairs of first and third transport rollers spaced apart, which are selectively separated to release the sheet, reducing skewing or distortion by allowing the sheet to move freely through the transport spaces defined by guides, thereby aligning with the transportation reference line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pairs of transport rollers hold a portion of the transported sheet while moving the pair of movable transport rollers in the axial direction, then the sheet can be transported, but skewing or distortion of the sheet occurs
Solution Approach 1:
The transport rollers are divided into multiple pairs: fixed pairs (first, second, third transport rollers) and movable pairs (movable transport rollers). This segmentation allows different regions of the sheet to be handled differently - some portions are held fixed while others are moved, enabling axial movement without causing skewing or distortion of the entire sheet.
Solution Approach 2:
The movable transport rollers are designed to move in the axial direction relative to the fixed transport rollers. This dynamic configuration allows the system to adjust the sheet position axially while maintaining proper sheet orientation, preventing skewing that would occur if all rollers were fixed or moved together.
2Productivity
If the pair of movable transport rollers is moved in the axial direction while held by multiple pairs of first transport rollers, then transportation can proceed, but skewing or distortion increases
Solution Approach 1:
The transport system is segmented into fixed and movable roller pairs, allowing selective movement. The movable transport rollers can move axially while the fixed first transport rollers remain stationary, enabling efficient transportation without compromising sheet alignment precision.
Solution Approach 2:
Different regions of the transport system have different properties: the first transport rollers are fixed to maintain sheet alignment, while the movable transport rollers can move axially to adjust position. This local differentiation of properties allows simultaneous achievement of transportation efficiency and alignment precision.
Data Source
AI summary
A sheet transport device includes a pair of movable transport rollers capable of transporting a sheet while holding the sheet and capable of moving in an axial direction crossing a transportation direction; pairs of first transport rollers disposed upstream from the pair of movable transport rollers in the transportation direction while being spaced apart from each other to transport the sheet while holding the sheet; and pairs of transport guides disposed to define sheet transport spaces between the pair of movable transport rollers and the pairs of first transport rollers and between the pairs of first transport rollers. When the pair of movable transport rollers is to be moved in the axial direction, first transport rollers in at least one of the pairs of first transport rollers are separated not to hold at least part of a portion of the transported sheet located upstream from the pair of movable transport rollers.