Detachable Rotation Detecting Unit for Sheet Feeding Maintenance
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Solution Overview
Problem
Existing image forming apparatuses face poor operativity during maintenance, such as exchange of detection units, due to contamination and interference issues, leading to increased complexity and size of the apparatus.
Innovation Solution
An image forming apparatus with a detachably mountable rotation detecting unit that includes an interrelating member, a detecting member, and a holding member, where the interrelating member, detecting member, and holding member are integrally assembled into a unit, allowing for improved maintenance and reduced apparatus size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotation detecting device is provided inside the feeding unit, then detection function is integrated, but maintenance operativity deteriorates due to contamination and interference issues
Solution Approach 1:
The rotation detecting device is segmented into a separate detachable unit that can be independently removed from the feeding unit. This allows the detection function to be integrated in design while enabling easy maintenance by detaching only the detection unit without disassembling the entire feeding mechanism.
Solution Approach 2:
The detecting means (sensor) is extracted from the feeding unit and placed in a separate detachable unit. This extraction resolves the contradiction by allowing the detection function to be integrated in the overall system while enabling easy maintenance through simple removal of the detection unit to avoid contamination from paper powder and toner.
2Measurement precision
If the detecting means sandwiches the lever or encoder wheel, then detection accuracy is improved, but maintenance complexity increases requiring demounting of detecting means
Solution Approach 1:
The detecting means is segmented into a separate detachable unit that can be independently removed. This maintains the sandwich structure for accurate detection while simplifying maintenance by allowing the detection unit to be detached as a single component rather than requiring disassembly of multiple parts.
Solution Approach 2:
The detecting unit is made dynamically removable and reattachable, transforming the static sandwich structure into a dynamic configuration that can be easily assembled and disassembled for maintenance while maintaining detection accuracy during operation.
3Volume of moving object
If both sensor and lever/encoder wheel are provided at end portion of feeding unit, then space utilization is improved, but apparatus width increases
Solution Approach 1:
The detecting unit is designed to be detachable along the axial direction, allowing the sensor and lever/encoder wheel to be positioned at the end portion for compactness in one dimension while enabling removal in another dimension to reduce overall apparatus width when not in use.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances maintenance operativity and reduces the size of the image forming apparatus by integrating the detecting unit, thereby simplifying maintenance and reducing the need for extensive disassembly, while preventing contamination and interference.
Implementation Method 1
a lever for permitting light transmission and light blocking of a sensor and an encoder wheel
Data Source
AI summary
An image forming apparatus includes a main assembly including an image forming portion; a rotatable member capable of feeding a sheet and configured to rotate; and a detecting unit including an interrelating member configured to rotate in interrelation with rotation of the rotatable member, a detecting member configured to detect rotation of the interrelating member, and a holding member configured to integrally hold the interrelating member and the detecting member. The interrelating member, the detecting member and the holding member are integrally assembled into a unit. The detecting unit is detachably mountable to the main assembly.