Developer Cartridge Gear Replacement for Slippage Prevention
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Solution Overview
Problem
Used developer cartridges in image-forming devices face gear slippage issues due to wear, leading to increased torque and potential damage, and the manufacturing of new cartridges with resin gears reinforced with glass fibers is environmentally burdensome and costly.
Innovation Solution
Replace original gears in the developer cartridge's gear mechanism with replacement gears having stronger teeth or a larger module, and optionally replace bearings and add sliding members to prevent slippage, using easier-to-manufacture resin materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same rotational shafts and bearings are kept when reusing the developer cartridge, then the structure is simple and manufacturing cost is low, but a greater torque would be applied to the gears leading to slippage among the gears
Solution Approach 1:
The patent changes the physical parameters of the gears by replacing them with larger-sized gears that have increased tooth depth and width. This parameter change allows the gears to withstand the increased torque generated by bearing wear during cartridge reuse, preventing gear slippage while maintaining the simplicity of keeping the same rotational shafts and bearings.
Solution Approach 2:
The patent segments the gear replacement process by providing separate replacement gears that can be independently installed into the cartridge. This allows the gear mechanism to be upgraded without replacing the entire cartridge or the rotational shafts and bearings, maintaining manufacturing simplicity while improving reliability.
2Reliability
If resin gears reinforced with glass fibers are used in new developer cartridges, then the gears can withstand high torque and prevent slippage, but the manufacturing becomes environmentally burdensome and costly
Solution Approach 1:
The patent applies the principle of disposable components by providing replacement gears that can be easily installed into used cartridges. These replacement gears are designed to be simple resin components without complex reinforcements, making them inexpensive and environmentally friendly to manufacture while sufficient for the intended reuse period.
Solution Approach 2:
Instead of changing the material composition to glass fiber reinforced resin, the patent changes the physical parameters of the gears by increasing their size and tooth depth. This parameter change provides the necessary strength to withstand torque without requiring environmentally burdensome reinforced materials.
3Reliability
If larger gears with stronger teeth are used in reused developer cartridges, then gear slippage is prevented, but the device complexity increases
Solution Approach 1:
The patent extracts only the necessary functional improvement by providing replacement gears that can be independently installed into the existing gear mechanism. The rotational shafts, bearings, and other gear components remain unchanged, minimizing the increase in device complexity while achieving the goal of preventing gear slippage.
Solution Approach 2:
The replacement gears are designed to be universal components that can be installed into various cartridge models with the same gear mechanism structure. This standardized approach prevents complexity increase by using the same basic gear design across different applications.
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
Prevents gear slippage during reuse, reduces environmental impact, and lowers manufacturing costs by using simpler and more recyclable materials in new cartridges.
Implementation Method 1
the toner is tribocharged between the supply roller and the developing roller
Data Source
AI summary
A method of reusing a developing device that can be detachably mounted in a body of an image-forming device includes: preparing a used developing device that includes a developer-carrying member that carries a developer thereon, and a gear mechanism having a plurality of gears that transfer a driving force inputted from the image-forming device to the developer-carrying member; and replacing at least one gear in the gear mechanism with at least one replacement gear that has stronger gear teeth, gear teeth that have a larger module, or gear teeth that have a greater working depth than the at least one original gear.