Sheet Conveying Apparatus Lever Jam Detection
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Solution Overview
Problem
Conventional sheet conveying systems face challenges in accurately detecting sheet information due to false detections caused by shock transmission and curling, leading to inefficient jam detection and potential damage during the conveying process.
Innovation Solution
A sheet conveying apparatus with a lever system that generates distinct signals based on its movement areas and applies a biasing force opposite to the sheet's push when in the second moving area, reducing false detections by restricting rotation beyond a predetermined position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor lever is used to detect sheet information by monitoring rotation angle, then sheet detection capability is provided, but false detection occurs when sheet front end or rear end pass the conveying roller beyond the sensor lever
Solution Approach 1:
The detection range of the sensor lever is segmented into multiple regions: a first moving area where the lever rotates due to sheet push, and a second moving area where the lever rotates due to shock transmission from sheet front end or rear end passing the conveying roller. By detecting which region the lever is in, the system can distinguish between actual sheet information and false signals.
Solution Approach 2:
A biasing portion (spring) is introduced as an intermediary element that applies a biasing force to the sensor lever. This biasing force helps stabilize the lever position and reduces excessive rotation caused by shock transmission, thereby reducing false detections while maintaining detection capability for actual sheet conditions.
2Measurement precision
If the sensor lever is pushed by the sheet and rotates significantly, then sheet thickness or loop growth is detected, but the sensor lever is repelled by the sheet face causing false detection
Solution Approach 1:
The system continuously monitors the position and rotation angle of the sensor lever during sheet conveyance. When the lever rotates beyond the first moving area into the second moving area, the system identifies this as a false signal condition and disregards the detection, thereby preventing loss of accurate sheet information while filtering out false data.
3Productivity
If the conveying roller continues pushing the jammed sheet until jamming is detected, then the sheet is caught by the conveying roller, but the toner image is melted by heat and the sheet faces are adhered
Solution Approach 1:
The sensor lever detection system performs preliminary detection of sheet conditions (thickness, loop growth, jamming) before the sheet reaches the conveying roller or before excessive pushing occurs. By detecting abnormal conditions in advance, the system can stop or adjust conveying operations before heat damage to the toner image or adhesion of sheet faces occurs.
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
This solution enhances the precision of jam detection and prevents false positives, allowing for safer operation and reduced risk of sheet damage during the conveying process.
Implementation Method 1
a biasing portion which does not apply to the lever a biasing force when the lever is in the first moving area, and applies to the lever a biasing force opposite in a direction in which the lever is pushed by the sheet and moves when the lever is in the second moving area
Data Source
AI summary
A sheet conveying apparatus has a conveying portion which conveys a sheet, a lever which is pushed by the sheet conveyed by the conveying portion, and moves from a standby position, a detecting portion which generates a signal corresponding to a position of the lever, and generates a first signal when the detecting portion detects movement of the lever in a first moving area from the standby position to a predetermined position and generates a second signal when the detecting portion detects movement of the lever in a second moving area beyond the predetermined position, and a biasing portion which does not apply to the lever a biasing force when the lever is in the first moving area, and applies to the lever a biasing force opposite in a direction in which the lever is pushed by the sheet and moves when the lever is in the second moving area.