Sheet Feed Conveying Amount Measurement Under Multi-Sheet Interference
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Solution Overview
Problem
Existing sheet conveying devices in image forming apparatuses face challenges in accurately measuring the conveying speed of sheets due to potential misalignment or interference when multiple sheets are fed, leading to reduced accuracy in conveying speed measurement.
Innovation Solution
A sheet conveying device with a lift portion, a sheet supply portion, and a detection portion that includes a first determination processing to assess execution conditions for measuring conveying speed, followed by a measurement processing to acquire speed information and a second acquisition processing to determine the conveying amount based on reference rotations, ensuring accurate speed measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conveying member rotates to supply sheets to the conveying path, then the sheet supply function is achieved, but the measurement precision of conveying speed deteriorates due to potential misalignment or interference when multiple sheets are fed
Solution Approach 1:
The system performs preliminary determination processing before measurement to assess whether execution conditions are satisfied. This preliminary check ensures that only when proper conditions are met (single sheet feeding without interference) does the measurement proceed, thereby preventing inaccurate measurements caused by multiple sheet interference while maintaining continuous sheet supply capability
Solution Approach 2:
The system implements feedback through the determination processing portion that continuously monitors whether execution conditions are satisfied based on detection portion data. This feedback mechanism allows the system to dynamically adjust measurement execution, ensuring high measurement precision by preventing measurements during multi-sheet interference conditions while maintaining productive sheet supply operations
2Ease of operation
If the detection portion detects sheets on the conveying path, then the sheet supply status is monitored, but the measurement precision deteriorates when multiple sheets cause interference
Solution Approach 1:
Before executing measurement processing, the determination processing portion performs preliminary verification of execution conditions using detection portion data. This preliminary action ensures that measurements are only taken when single-sheet feeding conditions are confirmed, eliminating interference from multiple sheets while maintaining continuous monitoring capability
Solution Approach 2:
The determination processing portion provides feedback by continuously evaluating detection portion information to assess whether execution conditions are satisfied. This feedback loop enables the system to distinguish between valid single-sheet measurement conditions and invalid multi-sheet interference conditions, thereby maintaining both monitoring functionality and measurement precision
Data Source
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AI summary
A sheet conveying device includes a sheet supply portion (28), a first acquisition processing portion (62), a measurement processing portion (63), and a second acquisition processing portion (64). The sheet supply portion (28) includes a conveying member (22) which rotates while being in contact with an upper surface of a stack of sheets (SB1) lifted by a lift portion (31), and supplies a sheet (SH1) in contact with the conveying member (22). The first acquisition processing portion (62) acquires speed information regarding a conveying speed of the sheet (SH1). The measurement processing portion (63) measures an elapsed time from a start of supply of the sheet (SH1) by the sheet supply portion (28) to when the sheet (SH1) is detected by a detection portion (25) after the conveying member (22) is rotated by a reference amount. The second acquisition processing portion (64) acquires a conveying amount of the sheet (SH1) when the conveying member (22) is rotated by the reference amount based on the acquired speed information and the elapsed time.