Double-Sided Document Transport Device with Upper Discharge Rollers
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Solution Overview
Problem
Conventional double-sided document transport devices face issues with document jamming and image quality due to the complex transport path and entanglement of documents when reversing, especially with discharge rollers positioned on the lower side, and the difficulty in separating discharge rollers from pinch rollers for easy jam removal.
Innovation Solution
The discharge rollers are mounted on the upper side, and the pinch rollers are fixed on the lower side, allowing for a simple mechanism to transmit drive force and separate the rollers, preventing entanglement and facilitating easy jam removal by opening the discharge section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the discharge roller is disposed on the lower side, then the structure is simple, but the document becomes entangled when reversed
Solution Approach 1:
The discharge roller is inverted from the conventional lower position to an upper position. This inversion prevents document entanglement during reverse rotation by eliminating the geometric configuration that caused the tangling problem, while the drive mechanism remains straightforward through external shaft transmission.
2Reliability
If the discharge roller is disposed on the upper side, then document entanglement is prevented, but the drive mechanism becomes complex
Solution Approach 1:
An intermediate shaft is introduced as a mediator to transmit drive force from the external motor to the discharge roller. This shaft serves as a straightforward transmission path that simplifies the overall drive mechanism while maintaining the upper position of the discharge roller for reliable document handling.
3Volume of moving object
If the discharge section is always closed, then the device is compact, but jammed documents cannot be easily removed
Solution Approach 1:
The discharge section is designed with dynamic openable and closable characteristics. A fulcrum mechanism allows the section to open for jam removal and close for compact operation, providing adaptability between these two states based on operational needs.
Solution Approach 2:
The discharge section is segmented as a separate, movable component that can be independently opened or closed. This segmentation allows easy access for jam removal when needed while maintaining compactness during normal operation, and the segment can be reset to its original position afterward.
4Stability of the object's composition
If the discharge roller is fixed to the frame, then the structure is stable, but the roller cannot be separated for jam removal
Solution Approach 1:
The discharge roller is designed with dynamic positioning capability, allowing it to be fixed to the frame during normal operation for structural stability, and separated when jam removal is needed. The fulcrum mechanism enables this dynamic transition between fixed and separated states.
Solution Approach 2:
The discharge roller is segmented from the frame through the fulcrum connection, allowing independent movement and separation. This segmentation maintains structural stability during operation while enabling easy separation for jam removal, and the roller can be reset to its fixed position afterward.
Data Source
AI summary
In a double-sided document transport device having a document reverse mechanism for suppressing the occurrence of jam and deterioration of read image, after a document is transported to a reading position, it is transported to the reading position again to read a rear side thereof through a reverse path. The device has discharge rollers disposed on an upper side and pinch rollers disposed on a lower side. The discharge rollers discharge a document as well as guides it to the reverse path by reversing it while claming the rear end thereof. The pinch rollers are fixed, and the discharge rollers are separated therefrom approximately upward about a rotation shaft of a transport unit. For this purpose, the discharge rollers are pressed against the pinch rollers and separated therefrom by a cancel lever. A drive system has two transmission routes one of which is reversed through a torque limiter and the other is reversed through an electromagnetic clutch.