Guide Surface Layout for Quiet Recording Medium Transport
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Solution Overview
Problem
The generation of bouncing sounds when the rear end of a recording medium disengages from a guide surface in a transport device is a common issue, particularly when the guide member is separated from the transporting roller and the guide surface shape is constant in the axial direction.
Innovation Solution
The transport device incorporates a guide member with a guide surface that extends to the downstream side in the transport direction, and the leading and rear ends of the guide surface are strategically positioned relative to the nip line to minimize bouncing, using a guide member with separation and overlapping portions to guide the recording medium effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the guide member is separated from the transporting roller and the guide surface shape is constant in the axial direction, then the device structure is simplified, but bouncing sounds are generated when the rear end of the recording medium disengages from the guide surface
Solution Approach 1:
The guide surface is designed with different shapes in different axial regions. The upstream side has a first shape while the downstream side has a second shape different from the first. This local variation in geometry allows the guide surface to adapt to different functional requirements along the transport path, suppressing bouncing sounds when the recording medium disengages while maintaining structural simplicity.
Solution Approach 2:
The guide member is designed to be movable relative to the transporting roller, allowing the guide surface position to change dynamically during operation. This dynamic adjustment capability enables the guide surface to maintain optimal contact with the recording medium throughout the transport process, preventing bouncing sounds without requiring a complex fixed structure.
2Object-generated harmful factors
If the guide surface extends to the downstream side, then bouncing sounds are suppressed, but the guide member structure becomes more complex
Solution Approach 1:
The guide surface extends to the downstream side with a specific second shape that differs from the upstream first shape. This localized extension and shape variation precisely where needed (at the downstream end) suppresses bouncing sounds without requiring complex structures throughout the entire guide member, achieving noise suppression with minimal added complexity.
Data Source
AI summary
A transport device includes a transporting roller that includes a first shaft portion, a first roller configured to have plural cylindrical first roller portions into which the first shaft portion is inserted and which are separated from each other in an axial direction of the first shaft portion, and a second roller coming into contact with the first roller and extends in a direction of the first shaft portion, and that transports a recording medium; and a guide member that is disposed on a first roller side with respect to a transport path of the recording medium and that is formed with a guide surface guiding the recording medium toward the transporting roller while changing a transport direction of the recording medium to be transported, the guide surface of a separation portion which is separated from the first roller in the axial direction extending to a downstream side in the transport direction as compared with the guide surface of an overlapping portion which overlaps the first roller in the axial direction.