Dual Transport Roller Velocity Control for Scanner Slippage
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Solution Overview
Problem
In document scanners, the sending force for original transportation can be insufficient when relying on a single transport roller, leading to adverse effects on reading results, particularly due to high transport loads upstream of the first transport roller, which may cause slipping and inadequate force delivery.
Innovation Solution
An image reading apparatus with a control member that executes multiple transporting modes, including a first mode where the original receives sending force from both transport rollers and a second mode where it receives force from only the first transport roller, with the largest set velocity value in the first mode set higher than in the second mode to ensure sufficient transportation and improve reading results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the original is transported by the first transport roller alone, then the device complexity is reduced, but the sending force becomes insufficient causing slipping and adverse effects on reading results
Solution Approach 1:
The patent combines the functions of two transport rollers (first and second transport rollers) to work cooperatively in transporting the original. The first transport roller receives the original from the feed roller and transports it to the reading member, while the second transport roller receives the original from the reading member and transports it to the discharge tray. This merging of transport functions ensures sufficient sending force throughout the entire transport path, preventing slipping and ensuring reliable reading results.
2Productivity
If the largest set velocity value in the first state is set higher, then the productivity is improved, but the sending force from a single transport roller becomes insufficient
Solution Approach 1:
The patent implements dynamic velocity control by setting different largest set velocity values for different transport states. In the first state where the original is transported by the first transport roller alone, a higher largest set velocity value is applied to improve productivity. In the second state where both transport rollers work together, a lower largest set velocity value is set. This dynamic adjustment optimizes transport velocity according to the actual sending force capacity in each state, maintaining both high productivity and sufficient sending force.
Data Source
AI summary
A first transport roller that is positioned upstream of a reading member and that applies sending force to an original, a second transport roller that is positioned downstream of the reading member and that applies sending force to the original. A first transporting mode is included in a plurality of transporting modes executable by a control member. The first transporting mode includes a period in which a largest set velocity value in transporting the original while in a first state in which reading is performed while the original receives sending force from, among the first transport roller and the second transport roller, the first transport roller alone is set higher than a largest set velocity value in transporting the original while in a second state in which reading is performed while the original receives sending force from both the first transport roller and the second transport roller.