Transport Roller Unit Coupling Mechanism for Easy Replacement
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Solution Overview
Problem
Existing medium transport devices, such as those in image reading devices, require cumbersome and time-consuming adjustments to tension belts when replacing transport rollers, making the replacement process troublesome.
Innovation Solution
A medium transport device with a transport roller unit and a drive unit, where the power transmitting and power transmitted portions are coupled and uncoupled by the transport roller unit's movement towards and away from the drive unit, allowing for easy attachment and removal of transport rollers without adjusting the drive unit's tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the transport roller is replaced by removing the pulley and belt, then the transport roller can be replaced, but the tension adjustment becomes troublesome and time-consuming
Solution Approach 1:
The device is divided into a drive unit (containing the motor and pulley) and a transport roller unit (containing the transport roller and power transmitted portion). This segmentation allows the transport roller unit to be independently removed and replaced without affecting the drive unit, eliminating the need for belt removal and tension adjustment during roller replacement.
Solution Approach 2:
A power transmitted portion is introduced as an intermediary component between the power transmitting portion (pulley and belt) and the transport roller. This intermediary allows the transport roller to be coupled and decoupled from the drive unit through simple movement, without requiring disassembly of the belt drive system or tension adjustment.
2Reliability
If the belt tension is adjusted after replacing the first transport roller, then the belt can function properly, but the adjustment process becomes troublesome and time-consuming
Solution Approach 1:
The power transmitted portion is designed to automatically maintain proper engagement with the power transmitting portion through the elastic element. When the transport roller unit is moved to the coupled position, the elastic element automatically tensions the belt to the appropriate level, eliminating the need for manual tension adjustment by the operator.
3Ease of operation
If the transport roller unit is designed with coupled and uncoupled states, then the replacement process is simplified, but the device structure becomes more complex
Solution Approach 1:
The transport roller unit is designed with movable support portions that can dynamically transition between coupled and uncoupled positions relative to the drive unit. This dynamic design allows the unit to be easily moved into and out of the operational position through simple linear movement, without requiring complex locking mechanisms or multiple fastening steps.
Solution Approach 2:
The elastic element's tension parameter changes automatically based on the position of the transport roller unit. When the unit is in the coupled position, the elastic element provides the necessary tension for power transmission. When moved to the uncoupled position, the tension is naturally released, allowing for easy removal without manual intervention.
Data Source
AI summary
A medium transport device includes a transport roller unit including transport rollers configured to transport a medium, and a drive unit that drives the transport rollers, the drive unit includes a power transmitting portion, the transport roller unit includes a power transmitted portion, the power transmitting portion and the power transmitted portion are brought into a coupled state by the transport roller unit moving in a direction approaching the drive unit, and the power transmitting portion and the power transmitted portion are brought into a uncoupled state by the transport roller unit moving in a direction away from the drive unit.