Wrinkle Detection Upstream of Feeding Section
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Solution Overview
Problem
Existing image reading apparatuses face challenges in accurately detecting wrinkled media, which can lead to incorrect jam detection and subsequent operational issues, as existing methods struggle to distinguish between wrinkled documents and actual jams.
Innovation Solution
A medium feeding device equipped with a wrinkle detection section, such as an optical sensor or contact-type sensor, placed upstream of the feeding section, which outputs detection values to control the feeding process, allowing for early detection of wrinkles and appropriate transport control to prevent jams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sound detection is used to determine jam, then jam detection capability is improved, but false detection of wrinkled documents as jams increases
Solution Approach 1:
The detection function is segmented into two independent sections: a wrinkle detection section upstream that detects wrinkles before feeding, and a sound detection section downstream that detects actual jams during transport. This segmentation allows each section to specialize in its detection type, preventing false positives where wrinkles are misidentified as jams.
Solution Approach 2:
The wrinkle detection section performs preliminary detection of wrinkles upstream before the document enters the feeding section. By detecting and flagging wrinkles in advance, the control section can adjust subsequent sound detection thresholds or handling procedures, preventing false jam detection of wrinkled documents while maintaining accurate jam detection capability.
2Measurement precision
If wrinkle detection is added upstream, then wrinkle detection accuracy is improved, but device complexity increases
Solution Approach 1:
The wrinkle detection section acts as an intermediary component placed upstream between the document source and the feeding section. This intermediary detects wrinkles early and provides information to the control section, enabling differentiated handling without requiring complete system redesign. The intermediary approach adds minimal complexity while achieving accurate wrinkle detection.
Solution Approach 2:
The control section is designed with multi-functionality, handling both wrinkle detection results and sound detection results through a unified control logic. This universal control approach integrates multiple detection functions without requiring separate control systems, reducing overall device complexity while maintaining high measurement precision for both wrinkle and jam detection.
3Reliability
If early wrinkle detection is implemented, then transport control reliability is improved, but feeding speed may be reduced
Solution Approach 1:
The feeding system implements dynamic speed adjustment based on wrinkle detection results. When wrinkles are detected, the feeding speed is temporarily reduced or paused to prevent jamming. When no wrinkles are detected, normal feeding speed is maintained. This dynamic adaptation ensures high transport control reliability while minimizing impact on overall productivity.
Solution Approach 2:
The system changes operational parameters (feeding speed, sound detection thresholds) based on wrinkle detection outcomes. By adjusting parameters dynamically rather than maintaining fixed conservative settings, the system achieves high transport control reliability without unnecessarily reducing feeding speed during normal operation, thus preserving productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively detects wrinkles before they cause jams, enabling more accurate determination of jam occurrences and preventing operational interruptions by adjusting feeding speeds or thresholds, thus ensuring reliable document transport and reading.
Implementation Method 1
an optical sensor that includes a light emitting unit that emits light to a surface of the medium placed on the placement unit and a light receiving unit that receives light reflected by the surface of the medium
Data Source
AI summary
A medium feeding device includes: a placement unit on which a medium is placed; a feeding section that feeds the medium placed on the placement unit; a wrinkle detection section that is provided on a further upstream side than the feeding section in a feeding direction and outputs a detection value in accordance with a wrinkle in the medium; and a control section that performs predetermined control on the basis of the detection value of the wrinkle detection section and stops the feeding section in a case in which the detection value output from the wrinkle detection section exceeds a predetermined allowable value.