Sheet Detection Device Distinguishing Size Disparity from Overlap Errors
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately determining whether sheets are conveyed under normal operating conditions, particularly in distinguishing between size disparities and fed-with-overlap errors.
Innovation Solution
A detection device equipped with a size sensor to detect the size of sheets in the direction of conveyance and a thickness sensor to detect the thickness of sheets, along with circuitry to determine disparities in sizes or fed-with-overlap errors based on the thickness data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only a size sensor is used to detect sheet conveyance, then the device complexity is reduced, but the measurement precision deteriorates because size disparities and fed-with-overlap errors cannot be distinguished
Solution Approach 1:
The detection function is segmented into two specialized sensors: a size sensor for detecting sheet dimensions and a thickness sensor for detecting sheet thickness. This segmentation allows each sensor to specialize in one type of measurement, improving overall detection precision while maintaining manageable device complexity through functional division.
Solution Approach 2:
The detection approach transitions from one-dimensional size measurement alone to two-dimensional measurement by adding thickness detection. This dimensional expansion enables the system to distinguish between size disparities (affecting length/width) and fed-with-overlap errors (affecting thickness), thereby improving measurement precision without excessive complexity increase.
2Measurement precision
If a thickness sensor is added to distinguish error types, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The thickness sensor serves multiple functions: it detects fed-with-overlap errors, verifies sheet presence, and provides data for error type classification. This multi-functionality justifies the added complexity by maximizing the utility of the additional sensor, improving measurement precision while keeping the device configuration practical.
Solution Approach 2:
The thickness sensor acts as an intermediary measurement tool that bridges the gap between simple size detection and complex error analysis. By providing thickness data as an intermediate parameter, it enables the error determination unit to accurately classify errors without requiring more complex direct detection methods.
3Reliability
If thickness detection is implemented, then the reliability of error determination improves, but the loss of time increases due to additional measurement processing
Solution Approach 1:
The thickness sensor performs detection in advance during sheet conveyance, and the error determination unit processes the data immediately upon receipt. This preliminary action approach ensures that both size and thickness measurements are captured before the sheet exits the detection zone, improving reliability while minimizing additional processing time through concurrent operation.
Solution Approach 2:
The detection system operates continuously during sheet conveyance, with the size sensor and thickness sensor collecting data simultaneously as sheets pass through. This continuous operation eliminates the need for separate measurement steps, maintaining high reliability through comprehensive data collection while avoiding time loss from sequential processing.
Data Source
AI summary
A detection device and an image forming apparatus. The detection device includes a size sensor to detect a size of a sheet in a direction of conveyance, the sheet being conveyed when detected by the size sensor, a thickness sensor to detect a thickness of the sheet, and circuitry to determine whether a disparity in sizes is occurring to the sheet or a fed-with-overlap error is occurring to the sheet, based on the thickness of the sheet detected by the thickness sensor. The image forming apparatus includes a detection device including a size sensor to detect a size of a sheet in a direction of conveyance, a thickness sensor to detect a thickness of the sheet, and circuitry to determine whether a disparity in sizes is occurring to the sheet or a fed-with-overlap error is occurring to the sheet, based on the thickness of the sheet.