Assist Roller Pair Transport Speed Stability
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Solution Overview
Problem
Existing transport apparatuses for image reading systems experience changes in medium transport speed due to back tension fluctuations, leading to image distortion and reduced accuracy in image data generation.
Innovation Solution
A transport apparatus with a third roller pair operated by both first and second motors, and controlled by a mechanism that ensures continuous operation even when the first motor is stopped, maintaining consistent transport speed by shifting power transmission states and adjusting driving current values to manage motor load and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the first motor is stopped when the medium is nipped by the resist roller pair and feeding roller pair, then the load on the second motor increases, but the transport speed changes due to back tension fluctuations
Solution Approach 1:
The assist roller pair acts as an intermediary element between the separation roller pair and the resist roller pair. When the first motor is stopped, the assist roller pair continues to operate and nip the medium, serving as a mediator that maintains continuous support and prevents back tension fluctuations that would otherwise occur when the separation roller pair stops operating.
Solution Approach 2:
The assist roller pair is designed to continue operating even when the first motor is stopped. This ensures continuous useful action on the medium throughout the transport path, preventing interruptions in the nipping and support function that would cause back tension changes and transport speed instability.
2Productivity
If the separation roller pair operation is stopped when the first motor is stopped, then the medium is transported by only the second motor, but back tension increases and transport speed changes
Solution Approach 1:
The assist roller pair serves as an intermediary that maintains continuous support for the medium even when the separation roller pair stops. This prevents sudden changes in the medium's transport conditions that would cause back tension fluctuations and speed inconsistencies.
Solution Approach 2:
The assist roller pair provides beforehand cushioning by being positioned between the separation roller pair and the resist roller pair. When the separation roller pair stops, the assist roller pair already in place cushions the medium, preventing sudden back tension increases and maintaining transport speed consistency.
3Adaptability or versatility
If the third roller pair is operated by both first and second motors, then power transmission can be shifted, but the system complexity increases
Solution Approach 1:
The assist roller pair is designed with multi-functionality, capable of being driven by either the first motor alone, the second motor alone, or both motors simultaneously. This universal design allows flexible power transmission configurations without requiring separate dedicated drive mechanisms for each operating mode.
Solution Approach 2:
The power transmission system merges the drive capabilities of the first and second motors into a single assisted roller pair mechanism. This consolidation allows both motors to contribute to driving the same roller pair, providing flexibility in power distribution while avoiding the need for completely separate transmission paths.
Data Source
AI summary
A transport apparatus includes: a separation roller pair which is operated when power is transmitted from a first motor; a resist roller pair which is operated when power is transmitted from a second motor; an assist roller pair which is disposed between the separation roller pair and the resist roller pair in the transport direction of the document; a first transmission mechanism portion which transmits the power from the first motor to the assist roller pair; a second transmission mechanism portion which transmits the power from the second motor to the assist roller pair; and a control portion which controls operation aspects of each roller pair.