Pressing Member Positioning to Reduce Vertical Lines in Scanning
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Solution Overview
Problem
Current image scanning technologies often result in vertical black lines on printed documents due to electrostatic charging and dust accumulation, which existing solutions like static brushes cannot effectively address, and regular professional cleaning is costly and inefficient.
Innovation Solution
An image scanning device with a conveyance path and a pressing member that includes a transparent support and scanning member, where the scanning position is set between the start and middle positions of the pressing member, perpendicular to the conveyance path, to reduce the occurrence of vertical black lines and eliminate the need for frequent professional cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a static brush is used to eliminate electrostatic charging, then electrostatic problems are reduced, but paper scraps and dust accumulate in the scanning position causing vertical black lines
Solution Approach 1:
The patent removes the static brush from the system entirely and replaces it with a pressing member that applies pressure to the document. This extraction eliminates the source of paper scrap and dust generation while still addressing the underlying problem through a different mechanism - using pressure instead of electrostatic discharge.
Solution Approach 2:
The patent replaces the electrostatic-based static brush with a mechanical pressing member. The pressing member uses mechanical pressure to improve document contact with the scanning surface, achieving the same goal of reducing scanning defects through a completely different physical principle that doesn't generate waste materials.
2Object-generated harmful factors
If professional cleaning is performed periodically to remove dust and paper scraps, then vertical black lines are reduced, but the cost and time increase significantly
Solution Approach 1:
The pressing member is designed to maintain document contact continuously during the scanning process without requiring external intervention. The system serves itself by using the document's own weight and the pressing member's force to ensure consistent contact, eliminating the need for periodic professional cleaning services.
Solution Approach 2:
The pressing member pre-establishes proper document contact before scanning begins and maintains it throughout the process. This preliminary action prevents dust and paper scraps from causing defects in the first place, rather than requiring corrective cleaning actions after problems have occurred.
3Device complexity
If the scanning position is placed below the conveyance path, then the structure is simplified, but vertical black lines appear due to dust accumulation in the scanning area
Solution Approach 1:
The pressing member acts as an intermediary between the document and the scanning surface. It ensures proper contact and prevents dust particles from interfering with the scanning process, mediating the interaction in a way that eliminates defects while maintaining the simple structural arrangement.
Data Source
AI summary
An image forming apparatus includes an image scanning device, which comprises: a document tray to load an original document to be scanned; a discharge tray to load the original document after being scanned; and a frame which the document tray and the discharge tray are mounted on. A conveyance path is formed inside the frame to connect the document tray and the discharge tray. The frame contains a conveying structure to convey the original document along the conveyance path; a transparent support member located below the conveyance path to support the original document; a scanning member located below the transparent support member, the scanning member having a scanning position in which the scanning member scans the original document when being located on the transparent support member; and a pressing member disposed above the transparent support member and facing the scanning member for pressing the original document onto the transparent support member.