Pivoting Developing Unit Gap Control for Drum Protection
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Solution Overview
Problem
Existing image forming apparatuses face challenges in safely moving the developing roller closer to and away from the photosensitive drum for maintenance and operation, risking damage to the peripheral surfaces during these processes.
Innovation Solution
The apparatus incorporates a support unit and switching mechanism that allows the developing unit to pivot, using a rotational drive force to move the developing roller closer to or away from the photosensitive drum, with a mechanism of gap rollers to maintain a predetermined gap during operation and increase the gap for safety during maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the developing roller is brought close to the photosensitive drum for image formation, then image formation can be performed, but the risk of damage to peripheral surfaces increases during maintenance and handling
Solution Approach 1:
The support unit is designed to pivot between two distinct positions: a first position where the developing roller is close to the photosensitive drum for image formation, and a second position where the developing roller is away from the photosensitive drum for maintenance. This dynamic repositioning allows the system to adapt between operational and maintenance states, resolving the contradiction between image formation capability and surface damage risk.
Solution Approach 2:
Before maintenance operations begin, the switching mechanism automatically or pre-positionedly moves the support unit to the second position, separating the developing roller from the photosensitive drum. This preliminary action prevents potential surface damage before it can occur during maintenance handling.
2Ease of repair
If the developing unit is made detachable for maintenance, then maintenance accessibility is improved, but the control over roller positioning becomes more complex
Solution Approach 1:
The switching mechanism is integrated with the detachable support unit structure, combining the positioning control function with the maintenance accessibility feature. The pivotable support unit with two fixed positions (close and away) provides controlled positioning without requiring complex active control systems, thus improving maintenance accessibility while limiting complexity increase.
3Manufacturing precision
If gap rollers are used to maintain a predetermined gap, then image quality is improved, but the mechanism complexity increases
Solution Approach 1:
The gap rollers are designed to automatically maintain a predetermined gap between the developing roller and photosensitive drum through their own structural configuration and the pivoting action of the support unit. The system self-regulates the gap without requiring external active control mechanisms, thus improving gap control precision while minimizing mechanism complexity.
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
This solution enhances user operability by allowing safe and controlled movement of the developing roller, reducing the risk of damage to the peripheral surfaces and improving maintenance accessibility.
Implementation Method 1
The urging member generates an urging force for urging the support unit to pivot in one of pivoting directions about the pivot shaft
Implementation Method 2
a transmission mechanism that transmits the rotational drive force received by the second drive input section to the first drive input section
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An image forming apparatus (1) includes a drive unit (70), an image bearing member (211), a developing unit (23), a support unit (30), an urging member (50), and a switching mechanism (40). The urging member (50) generates an urging force for pivoting the support unit (30) in an approaching direction in which a peripheral surface of a developing roller (231) is moved toward a peripheral surface of the image bearing member (211). The switching mechanism (40) switches the support unit (30) between a first position (fitting position) and a second position (releasing position). The support unit (30) includes: a second drive input section (73) disposed coaxially with a pivot shaft and for receiving a rotational drive force from a drive output shaft of the drive unit (70); and a transmission mechanism (37) for transmitting the rotational drive force to a first drive input section (63). The rotation direction of the rotational drive force is for rotation in a direction of pivoting the support unit (30) in the approaching direction.