Asymmetric Holding Members for Sheet Alignment in Image Recording
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In image recording apparatuses, sheets can become inclined during transport due to asynchronous release from holding members, leading to angular moment forces that cause the sheet to rotate and become misaligned, resulting in uneven image recording.
Innovation Solution
The apparatus is designed with holding members positioned in a central area of the transport passage, ensuring that the upstream end of the sheet passes through the central holding member last, preventing angular moment forces and maintaining the sheet's alignment by pressing it from both front and back surfaces, thus preventing inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If holding members are provided in a direction perpendicular to the transport direction of the sheet, then the sheet can be pressed toward the platen to prevent floating during image recording, but the sheet may become inclined due to asynchronous release timing causing angular moment forces
Solution Approach 1:
The holding members are arranged asymmetrically in the transport direction, with the central holding member positioned downstream relative to outer holding members. This asymmetric arrangement ensures that the central holding member releases the sheet last, preventing asynchronous release that causes angular moment forces and sheet inclination.
Solution Approach 2:
The holding members are divided into multiple segments positioned at different locations (central and outer holding members) with different release timings. This segmentation allows controlled sequential release of the sheet, preventing simultaneous release that would create rotational forces.
2Stability of the object's composition
If the sheet is pressed by holding members during transport, then the sheet can be prevented from separating from the transport passage, but the pressing force may cause the sheet to become inclined when released asynchronously
Solution Approach 1:
The holding members are positioned and timed to release the sheet in a specific sequence before the sheet completes its transport. The central holding member is designed to release last, preliminarily preventing any inclination from occurring during the release process by maintaining central support until outer holding members have already released.
3Reliability
If multiple holding members are used to press the sheet from both front and back surfaces, then the sheet can be securely held during transport, but complex arrangement may cause asynchronous release and sheet rotation
Solution Approach 1:
Different holding members are assigned different positions in the transport direction based on their function. The central holding member is positioned downstream to provide final stabilization, while outer holding members are positioned upstream for initial holding. This local differentiation of positions simplifies the overall arrangement by creating a clear functional gradient.
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 configuration effectively prevents sheet inclination during transport, ensuring accurate and aligned image recording by maintaining the pressing force until the sheet has fully passed through the holding members, thereby stabilizing the sheet's position and preventing rotation.
Implementation Method 1
a plurality of holding members 90A to 90I which press a sheet 35 transported along a transport passage 65 from both front and back surfaces of the sheet 35
Data Source
AI summary
An image recording apparatus for recording an image on a sheet includes a recording section which records the image on the sheet in a transport passage for transporting the sheet in a transport direction and multiple plates which are spaced apart from each other in a widthwise direction. These multiple plates include a first type of plate and a second type of plate. Plates of a first type of plate are configured to overlap a sheet when viewed in a direction perpendicular to the transport direction and the widthwise direction, while plates of the second type of plate do not.