Sheet Conveyance Alignment via Distance Detection and Control
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Solution Overview
Problem
In sheet conveying apparatuses, such as automatic document feeders, when a sheet bundle is placed with unaligned end portions, the difference in separation distance between regulating units may exceed a threshold, restricting conveyance until manual alignment is done, which is cumbersome for users.
Innovation Solution
A system that includes a conveyance unit, regulating units, detection, restriction, and cancellation processing units to detect separation distances, restrict conveyance if exceeding a threshold, and cancel the restriction when the distance returns within acceptable limits, allowing automatic alignment and preventing inclined sheet conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the execution of conveyance processing is restricted when the difference between separation distance and sheet size exceeds a threshold value, then inclined sheet conveyance is prevented, but user operation becomes cumbersome due to manual alignment requirements
Solution Approach 1:
The system performs self-alignment by automatically detecting the separation distance between regulating units and adjusting the conveyance process accordingly. The control unit monitors the distance and autonomously determines whether to permit or restrict conveyance execution, eliminating the need for manual user alignment while maintaining conveyance accuracy through automated threshold-based control
Solution Approach 2:
The system implements feedback control by continuously detecting the separation distance between regulating units and using this information to dynamically control the conveyance process. The control unit receives distance detection results and adjusts conveyance execution based on whether the detected distance falls within the acceptable threshold range, creating a closed-loop control system that prevents inclined conveyance while simplifying user operation
2Manufacturing precision
If manual alignment is required to reduce the difference within threshold value, then conveyance accuracy is maintained, but productivity decreases due to additional user effort
Solution Approach 1:
The system performs preliminary detection of the separation distance between regulating units before conveyance execution. By detecting the distance in advance and pre-determining whether the difference exceeds the threshold value, the system prepares the conveyance control decision beforehand, eliminating the need for iterative manual alignment adjustments and thereby maintaining position accuracy while improving processing speed
Solution Approach 2:
The control unit autonomously manages the entire alignment and conveyance decision process without requiring user intervention. The system self-evaluates the separation distance, self-determines compliance with threshold requirements, and self-executes the appropriate conveyance control action, thereby maintaining manufacturing precision while eliminating productivity losses associated with manual alignment operations
Data Source
AI summary
A sheet conveying apparatus includes a pair of regulating units both of which are movable in a width direction in a document placement unit, a detection processing unit that detects a separation distance between the pair of regulating units, a restriction processing unit that restricts execution of a specific process of conveying a document when a difference between the separation distance detected at a specific timing and a reference distance exceeds a threshold value, and a cancellation processing unit that cancels the restriction on execution of the specific process when the separation distance detected after the restriction on execution of the specific process by the restriction processing unit is the same as the separation distance detected before the detection timing of the separation distance and on or after the specific timing.