Developing Roller Drive Layout for Smooth Clutch Torque Switching
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Solution Overview
Problem
Existing image forming apparatuses experience a large torque change when switching the clutch mechanism from a transmission state to a non-transmission state, causing an impact on the developing roller.
Innovation Solution
Incorporating a second driving-force transmission unit with a brake portion to apply load to the second driven member, connected to the first driving-force transmission unit between the clutch mechanism and the first driven member, allowing for a smoother transition by combining torques during state changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a clutch mechanism is used to switch between transmission and non-transmission states, then the driving force can be selectively transmitted to the first driven member, but a large torque change occurs when switching from transmission state to non-transmission state, causing impact
Solution Approach 1:
The patent introduces a second driving-force transmission unit with a brake portion as an intermediary element between the driving source and the first driven member. This intermediary provides a alternative torque transmission path that includes braking action, allowing smooth transition when the clutch switches states by dissipating excess torque through the brake mechanism rather than directly impacting the first driven member
2Productivity
If the clutch mechanism is switched from transmission state to non-transmission state, then the driving force transmission is stopped, but the torque applied to the first driven member instantaneously becomes zero, causing larger change in torque
Solution Approach 1:
The patent applies preliminary braking action through the second driving-force transmission unit before the clutch completely disengages. The brake portion is activated in advance to gradually reduce torque on the first driven member, preventing instantaneous torque drop and maintaining torque stability during the transition from transmission to non-transmission state
3Adaptability or versatility
If the clutch mechanism is switched from transmission state to non-transmission state, then the driving force is no longer transmitted, but a larger impact is caused to the system
Solution Approach 1:
The patent implements beforehand cushioning by introducing the brake portion in the second driving-force transmission unit that absorbs and dissipates the impact energy before it can damage the mechanical system. The brake mechanism acts as a cushion during clutch state transitions, protecting the system from shock and vibration while maintaining the adaptability of clutch switching
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 reduces the torque impact during clutch state transitions, enhancing operational stability and reducing mechanical stress on components.
Implementation Method 1
a brake portion configured to produce brake force to apply load to rotation of the second driven member
Data Source
AI summary
An image forming apparatus includes a driving source, a first driven member, a second driven member, a first driving-force transmission unit configured to transmit driving force output from the driving source to the first driven member, the first driving-force transmission unit including a clutch mechanism, and a second driving-force transmission unit configured to transmit the driving force to the second driven member, the second driving-force transmission unit including a brake portion. The second driving-force transmission unit is connected to the first driving-force transmission unit between the clutch mechanism and the first driven member. In a case where the clutch mechanism is in the transmission state, the first driven member is driven by both of a first torque transmitted via the first driving-force transmission unit, and a second torque transmitted via the brake portion of the second driving-force transmission unit.