Dual Roller Transport Bearing Alignment
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Solution Overview
Problem
Medium transport apparatuses with rollers at different positions in the transport direction face accuracy issues when the rotary shafts of the rollers are not parallel, making it difficult to maintain transport accuracy and preventing the use of certain medium types.
Innovation Solution
Incorporating a bearing portion that contacts both rotary shafts of the first and second rollers, allowing for precise control and alignment of the shafts, and adjusting the transport capacity and pressure of each roller to prevent wrinkles and improve reading performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a medium is transported by a first roller and a second roller provided at different positions in the transport direction, then transport accuracy is improved and usable medium types are increased, but it becomes difficult to arrange the rotary shafts parallel to each other when they are positioned on separate frames
Solution Approach 1:
The patent combines the bearing portions for both the first roller's rotary shaft and the second roller's rotary shaft into a single integrated structure. This merging allows both shafts to be supported by the same bearing portion, making it easier to arrange them parallel to each other while maintaining transport accuracy through multiple rollers at different positions
2Measurement precision
If a contact image sensor-type reading unit is used to read the medium, then reading performance is improved, but the distance between the reading unit and medium must be controlled to prevent degradation
Solution Approach 1:
The patent preliminarily controls the transport distance and position of the medium through the first and second rollers before it reaches the contact image sensor-type reading unit. By pre-adjusting the medium's position and tension during transport, the system ensures the medium is at the optimal distance from the reading unit, maintaining high reading performance without requiring complex real-time distance control mechanisms
Data Source
AI summary
A medium transport apparatus includes a first roller configured to transport a medium, a second roller configured to transport the medium at a different position, in the transport direction of the medium, from the first roller, the second roller including a rotary shaft parallel to a rotary shaft of the first roller, and a bearing portion configured to contact with both the rotary shaft of the first roller and the rotary shaft of the second roller in an area in an extending direction of the rotary shaft, within which the transported medium passes.