Image Forming Apparatus Perforated Paper Cut-Off Detection
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Solution Overview
Problem
Image forming apparatuses face challenges in performing automatic double-sided printing on perforated papers with partial cut-offs, leading to faulty sheet-passing due to mismatched leading and trailing edges during the conveyance process, which existing systems struggle to handle effectively.
Innovation Solution
An image forming apparatus equipped with a processor that receives information about the printing material's condition and displays an alarm when a partial cut-off is detected, preventing automatic double-sided printing to avoid faulty sheet-passing by determining whether the perforated paper can be safely processed based on input information and conveyance sensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic double-sided printing is performed on perforated paper with partial cut-offs, then printing efficiency is improved, but faulty sheet-passing occurs due to mismatched leading and trailing edges
Solution Approach 1:
The system performs preliminary detection of the printing material's leading edge position and cut-off status before initiating automatic double-sided printing. By detecting whether the trailing edge position matches the expected position based on the leading edge detection, the system identifies unsuitable printing material in advance and prevents faulty sheet-passing before it occurs, thereby maintaining reliability while enabling efficient printing on suitable materials
Solution Approach 2:
The system uses conveyance sensors to detect the actual position of the leading and trailing edges of the printing material, compares this feedback information with the expected position calculations, and determines whether the material is suitable for automatic double-sided printing. This feedback mechanism enables real-time quality control and prevents processing of unsuitable materials
2Manufacturing precision
If detection of printing material length and cut-off portions is implemented, then printing quality is improved, but device complexity increases
Solution Approach 1:
The conveyance sensors in the printing device serve multiple functions: they detect the leading edge position, calculate the trailing edge position, determine material length, and identify cut-off portions. By making the detection system multi-functional, the patent achieves high printing quality without adding separate dedicated detection devices, thus avoiding increased device complexity
Solution Approach 2:
The system uses the existing conveyance structure and sensors to perform self-detection of material characteristics. The printing device leverages its own conveyance mechanism to automatically detect and evaluate the suitability of the printing material, eliminating the need for external or additional complex detection equipment
Data Source
AI summary
An image forming apparatus includes an image forming unit configured to form an image on a sheet of perforated paper; an input unit configured to receive first information and second information; and a processor configured to display an alarm display without performing sheet-passing of the sheet of perforated paper. The first information is information concerning the sheet of perforated paper on which an image is to be formed by the image forming unit and the second information is information concerning whether to perform automatic double-sided printing on the sheet of perforated paper or not. The processor is configured to display the alarm display in a case where the automatic double-sided printing is instructed and it is determined that the sheet of perforated paper has a cut-off portion.