Auxiliary Feeding Roller Displacement Mechanism for Image Scanners
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Solution Overview
Problem
Existing image reading apparatuses with auxiliary feeding members suffer from user burden and poor medium setting performance due to high frictional forces, leading to potential damage during medium placement.
Innovation Solution
An image reading apparatus featuring a feeding roller and an auxiliary feeding roller with displacement members that transition between non-contact and contact positions, preventing medium contact during standby and enabling contact during feeding, along with a gear train and elastic auxiliary feeding roller to improve feeding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an auxiliary feeding roller is provided upstream of the feeding roller to improve medium feeding performance, then feeding performance is improved, but the medium contacts with the auxiliary feeding member during setting causing damage and imposing great burden on user
Solution Approach 1:
The auxiliary feeding roller is designed to be movable between a first position (contacting the medium) and a second position (separated from the medium). During medium setting, the roller is positioned at the second position to avoid contact and reduce user burden. During feeding operation, it moves to the first position to assist the feeding roller, thus dynamically adapting its function to resolve the contradiction between feeding performance and ease of operation.
Solution Approach 2:
The system performs preliminary action by positioning the auxiliary feeding roller at the second position (separated from medium) before medium setting occurs. This preliminary positioning prevents harmful contact during setting, and the roller is then moved to the first position (contacting medium) in advance of the feeding operation to ensure smooth feeding when needed.
2Force
If the auxiliary feeding member is formed of material having high frictional force with respect to the medium to feed the medium, then feeding capability is improved, but the force applied damages the medium during setting
Solution Approach 1:
The auxiliary feeding roller is designed to be movable between a first position (contacting the medium) and a second position (separated from the medium). During medium setting, the roller is positioned at the second position to avoid contact and reduce user burden. During feeding operation, it moves to the first position to assist the feeding roller, thus dynamically adapting its function to resolve the contradiction between feeding performance and ease of operation.
Solution Approach 2:
The system applies preliminary anti-action by positioning the auxiliary feeding roller at the second position (separated from medium) before the harmful contact during setting can occur. This preliminary separation prevents the high frictional force from damaging the medium during setting, while allowing the same high frictional force to be utilized beneficially during feeding operation when the roller is at the first position.
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
Enhances medium feeding and setting performance by reducing user burden and preventing damage, while maintaining efficient feeding and transport of documents.
Implementation Method 1
the auxiliary feeding member such as an auxiliary feeding roller is formed of a material having a high frictional force with respect to the medium so as to feed the medium
Data Source
AI summary
An image reading apparatus includes a first displacement member configured to be displaced between a first non-contact position at which a medium and a feeding roller do not contact with each other and a first contact position at which those contact with other, and a second displacement member configured to be displaced between a second non-contact position at which the medium and the feeding roller do not contact with each other and a second contact position at which those contact with other. The second displacement member is displaced from the second non-contact position to the second contact position as the first displacement member is displaced from the first non-contact position to the first contact position, and is displaced from the second contact position to the second non-contact position as the first displacement member is displaced from the first contact position to the first non-contact position.