Medium Conveying Apparatus Booklet Jam Prevention
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Solution Overview
Problem
Medium conveying apparatuses face issues with paper jams when attempting to feed booklets in separation mode, leading to feeding abnormalities and potential damage to the medium.
Innovation Solution
A medium conveying apparatus equipped with a movement sensor, medium sensors, and a processor that generates movement amount signals and detects medium presence and size to determine feeding abnormalities, stopping the feed roller when a predetermined size condition is met to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the feed roller feeds medium in separation mode, then paper can be conveyed one by one, but booklets may be fed by mistake causing paper jams
Solution Approach 1:
The system performs preliminary detection of medium size and deformation state before feeding occurs. The movement sensor detects arm displacement caused by medium deformation, and the medium sensor detects medium presence and size, allowing the system to identify booklets before they are fed into the separation mode, preventing jams before they occur.
Solution Approach 2:
The system uses feedback from movement sensors and medium sensors to monitor medium characteristics during feeding. The movement amount signal from the arm displacement provides continuous feedback about medium deformation, enabling real-time detection of booklet feeding attempts and automatic stopping to prevent damage.
2Reliability
If the conveying apparatus stops feeding when deformation is detected, then medium damage is prevented, but false alarms occur with larger papers that are partially deformed or floated
Solution Approach 1:
The system applies different detection criteria based on medium size. Small mediums (booklets) are evaluated based on movement amount exceeding a first threshold, while large mediums (papers) use a second, higher threshold. This localized quality control allows the system to be sensitive to booklet deformation while tolerating normal paper fluctuations.
Solution Approach 2:
The system changes the detection parameter (threshold value) based on medium size. When a large paper is detected, a higher threshold is applied to account for normal deformation and floating. When a small booklet is detected, a lower threshold is applied to detect even minor deformation that indicates booklet feeding. This dynamic parameter adjustment prevents false alarms while maintaining accurate detection.
Data Source
AI summary
A medium conveying apparatus includes a medium tray, a feed roller, an upper guide, a movement sensor including an arm movably provided by the fed medium on the upper guide and on an upstream side of the feed roller, to generate a movement amount signal corresponding to a movement amount of the arm, a medium sensor to detect a presence of the medium at a predetermined position of the medium tray, a processor to determine whether a feeding abnormality of the medium has occurred based on the movement amount signal, detect a size of the medium placed on the medium tray based on a detection result by the medium sensor, and stop feeding of the medium by the feed roller when the processor determines that the feeding abnormality of the media has occurred and the detected size of the media is equal to or less than a predetermined size.