Rotatable Clutch Control Member for Developing Roller Drive Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face challenges in efficiently switching the drive transmission between the developing roller and the photosensitive drum, leading to operational inefficiencies and maintenance complexities.
Innovation Solution
A cartridge with a rotatable clutch mechanism that includes a control member and a locking portion, allowing for precise control of drive force transmission and blocking, enabling seamless switching between operational and non-operational states of the developing roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a clutch mechanism is provided at the end of the developing roller for drive switching, then the developing roller can be kept non-driven when image formation is not carried out, but the device complexity increases due to additional components and maintenance requirements
Solution Approach 1:
The clutch mechanism is integrated with the developing roller assembly, merging the drive switching function into the existing structure. The control member is rotatably supported by the supporting portion that is already part of the developing roller mounting structure, eliminating the need for separate drive switching components and reducing overall device complexity.
Solution Approach 2:
The clutch mechanism is designed to be automatically controlled by the interaction between the locking portion on the control member and the locked portion on the clutch. When the developing roller is separated from the photosensitive drum, the locking portion automatically engages with the locked portion to block drive transmission, eliminating the need for external control systems or additional actuators.
2Loss of energy
If drive transmission is blocked when image formation is not carried out, then energy loss is reduced, but the operational responsiveness deteriorates due to the time required to engage the clutch mechanism
Solution Approach 1:
The control member is pre-positioned such that the locking portion is already near the locked portion of the clutch mechanism. When the developing roller is separated from the photosensitive drum, the locking portion quickly engages with the locked portion through a small rotational movement, enabling rapid drive switching without significant delay.
Solution Approach 2:
The clutch mechanism uses a rotatable control member that can rapidly transition between engaged and disengaged states. The locking portion can rotate about the supporting portion to quickly engage or disengage from the locked portion, providing fast response time for drive switching when image formation conditions change.
3Reliability
If a control member with locking portion is rotatably supported by the supporting member, then precise control of drive force transmission is achieved, but the device complexity increases due to additional moving parts
Solution Approach 1:
The control member serves multiple functions: it controls the engagement and disengagement of the clutch mechanism, transmits rotational motion when the developing roller is driven, and positions the locking portion relative to the locked portion. This multi-functionality reduces the need for separate control components and minimizes the number of moving parts.
Solution Approach 2:
The locking portion is integrated into the control member structure, and the control member itself is rotatably supported by the existing supporting portion of the developing roller assembly. This nested arrangement incorporates the control function within the existing structure rather than adding separate external control mechanisms.
4Reliability
If the locking portion is rotatable about the supporting portion between non-locking and locking positions, then drive force transmission control is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The locking portion and locked portion are designed with complementary geometries that create a natural engagement position. When the control member rotates to the locking position, the locking portion automatically aligns with the locked portion through the rotational motion, reducing the need for high-precision positioning during manufacturing. The engagement is achieved through the mechanical interaction rather than precise pre-positioning.
Data Source
AI summary
A control member 76 for controlling transmission and blocking of a rotational force by a clutch is rotatably supported by a supporting member which supports a developing frame. a locking portion provided on the control member 76 rotates between a position retracted from a locked portion of the clutch and a position for engaging with the locked portion.