Elastically Deformable Charging Roller With Inclined Pressing Section
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Solution Overview
Problem
Conventional image forming units face increased costs and structural complexity due to the use of charging rollers with shafts, and generate image noises from adhering substances accumulating at the contact point between charging sheets and photoconductors.
Innovation Solution
An image forming unit with an elastically deformable charging roller that contacts the photoconductor and is regulated by a member with an inclined pressing section, forming a wedge structure to ensure consistent contact and prevent adhering substances from accumulating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a charging roller with shaft and spring is used to press the charging roller against the photoconductor, then the charging roller can be brought into pressure contact with the photoconductor, but the structure becomes complicated and cost increases
Solution Approach 1:
The invention removes the shaft from the charging roller structure, extracting the unnecessary component that caused complexity. The charging roller is directly supported by the regulating member with pressing section, eliminating the need for shafts and springs while maintaining the pressure contact function between the charging roller and photoconductor.
Solution Approach 2:
The charging roller is designed to be self-regulating through the inclined pressing section. As the photoconductor rotates, the charging roller automatically moves along the inclined surface, maintaining constant pressure contact without requiring external spring mechanisms or shafts for support.
2Device complexity
If a charging sheet is brought into contact with the photoconductor, then the structure is simplified, but adhering substances accumulate on the contact portion causing image noises
Solution Approach 1:
The invention transitions from a static charging sheet to a dynamic charging roller system. The charging roller rotates in sync with the photoconductor, creating continuous motion at the contact interface that prevents adhering substances from accumulating, thereby eliminating image noises while maintaining structural simplicity.
Solution Approach 2:
The invention replaces the stationary charging sheet mechanism with a rotating charging roller system. This mechanical substitution introduces rotational motion that continuously renews the contact surface, preventing the accumulation of toner and other adhering substances that cause image defects.
3Object-generated harmful factors
If the charging roller is pressed against the photoconductor by an inclined pressing section, then adhering substances are prevented from accumulating, but the charging roller must be elastically deformable
Solution Approach 1:
The invention changes the physical parameter of the charging roller from rigid to elastically deformable. This material property change allows the roller to conform to the photoconductor surface and maintain consistent pressure contact through the inclined pressing section, preventing adhering substance accumulation while adapting to surface variations.
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
The solution allows for uniform charging of the photoconductor with a simplified structure and prevents abnormal discharges from adhering substances, enhancing image forming quality and reducing maintenance costs.
Implementation Method 1
an elastically deformable charging roller for charging the photoconductor, which roller contacts with an outer face of the photoconductor
Implementation Method 2
The charging roller rotates following the rotation of the photoconductor
Data Source
AI summary
An image forming unit is provided with a regulating member placed in such a way as to surround a charging roller to regulate movement thereof. The regulating member has a pressing section inclined with respect to a straight line connecting the center of the charging roller to the axis of the photoconductor, as seen from the axial direction of the photoconductor. The pressing section is inclined farther away from the photoconductor toward upstream of rotation of the photoconductor. The regulating member allows the charging roller to electrically charge the photoconductor with a simplified structure and prevents adhering substances from accumulating on the contact portion between the photoconductor and the charging roller.