Sheet Conveyance Control via Positional Data Extraction
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Solution Overview
Problem
Conventional sheet conveying devices in image forming apparatuses face challenges in achieving commonality across multiple models due to complex device configurations and reliance on sensor detection states, leading to reduced development efficiency and increased production difficulties.
Innovation Solution
A sheet conveying device design that includes a first and second conveying roller, a detection sensor, and a controller that controls roller drive states based solely on positional information output by a leading-end position output unit, without relying on sensor detection states, allowing for accurate sheet positioning and simplified device configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor detection states are used to control roller drive states, then sheet conveying accuracy is improved, but device complexity increases and commonality across models decreases
Solution Approach 1:
The patent extracts the sensor detection dependency from the control system by using only positional information from the leading-end position output unit. The controller determines roller drive states based solely on calculated sheet position data, eliminating the need to process sensor detection states and their variations across different models.
Solution Approach 2:
The patent creates a universal control approach that works across multiple device models by using a standardized positional information-based control method. The same control logic can be applied to different models without needing to account for sensor position variations, enhancing commonality and reducing development complexity.
2Measurement precision
If sensor detection states are used to control roller drive states, then sheet conveying accuracy is improved, but development efficiency decreases
Solution Approach 1:
The patent removes the complex sensor detection state processing from the control logic, retaining only the essential positional information function. This simplification allows for faster development and easier maintenance while preserving the core sheet position detection capability.
3Measurement precision
If sensor detection states are used to control roller drive states, then sheet conveying accuracy is improved, but production complexity increases
Solution Approach 1:
The patent extracts and eliminates the need to manage sensor detection states in production. By relying solely on positional information from the leading-end position output unit, the system reduces assembly variations and simplifies quality control during manufacturing.
Data Source
AI summary
A sheet positional information updating unit of a sheet conveying device updates positional information on a leading end of a sheet by adding a sheet feed amount of a second-stage vertically conveying roller. The sheet positional information updating unit stops the update of the positional information when a first-stage vertically conveyance sensor does not detect the leading end of the sheet in the case that the positional information on the leading end of the sheet arrives at a position on an upstream side of a leading-end detection position of the first-stage vertically conveyance sensor. The sheet positional information updating unit resumes the update of the positional information on the leading end of the sheet in the case that first-stage vertically conveyance sensor detects the leading end of the sheet.