Stepwise Sheet Conveyance Speed Control for Misfeed Reduction
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Solution Overview
Problem
Conventional paper feeding and conveying apparatuses face issues with prolonged paper feeding times due to inconsistent speed adjustments and increased misfeeds when paper is difficult to feed, and excessive speed changes when rollers are worn out.
Innovation Solution
A sheet member conveying apparatus with a detecting mechanism and controller that incrementally increase the conveying speed in a stepwise manner based on the normalcy of conveyance, optimizing the speed to maximize efficiency and reduce misfeeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conveying speed is immediately set to maximum speed after normal conveyance, then the productivity is improved, but the reliability deteriorates due to increased misfeeds
Solution Approach 1:
The conveying speed is made dynamic rather than fixed, automatically adjusting between minimum and maximum speeds based on conveyance success. The system transitions from a static speed setting to a dynamic one that adapts to real-time conveyance conditions, resolving the contradiction between speed and stability.
Solution Approach 2:
A feedback mechanism is implemented where the conveying speed is adjusted based on detection results from the conveying state detection unit. When conveyance is successful, speed increases; when misfeed occurs, speed decreases. This closed-loop feedback system resolves the contradiction by using actual conveyance performance to control speed.
2Reliability
If the conveying speed is gradually decreased when misfeed occurs, then the reliability is improved, but the productivity deteriorates due to prolonged feeding time
Solution Approach 1:
The conveying speed is made dynamic rather than fixed, automatically adjusting between minimum and maximum speeds based on conveyance success. The system transitions from a static speed setting to a dynamic one that adapts to real-time conveyance conditions, resolving the contradiction between speed and stability.
Solution Approach 2:
A feedback mechanism is implemented where the conveying speed is adjusted based on detection results from the conveying state detection unit. When conveyance is successful, speed increases; when misfeed occurs, speed decreases. This closed-loop feedback system resolves the contradiction by using actual conveyance performance to control speed.
3Productivity
If the conveying speed is returned to maximum speed after each successful conveyance, then the productivity is improved, but the reliability deteriorates when rollers are worn out causing repeated misfeeds
Solution Approach 1:
The conveying speed is made dynamic rather than fixed, automatically adjusting between minimum and maximum speeds based on conveyance success. The system transitions from a static speed setting to a dynamic one that adapts to real-time conveyance conditions, resolving the contradiction between speed and stability.
Solution Approach 2:
A feedback mechanism is implemented where the conveying speed is adjusted based on detection results from the conveying state detection unit. When conveyance is successful, speed increases; when misfeed occurs, speed decreases. This closed-loop feedback system resolves the contradiction by using actual conveyance performance to control speed.
Data Source
AI summary
In a facsimile device, a CPU determines whether or not a recording sheet is conveyed normally based on the conveyance state detected by a detecting portion. When the CPU determines that the recording sheet has been conveyed normally, the CPU increases the conveying speed in a stepwise manner based on the current conveying speed until the conveying speed reaches maximum speed. Therefore, according to the present facsimile device, when conveyance of the recording sheet is normally performed at a specified conveying speed, the number of failures of conveyance of the recording sheet can be reduced compared to a facsimile device, in which the conveying speed is set at maximum speed of conveyance by a sheet feed roller. Also, the recording sheet can be conveyed at as high speed as possible.