Roller Device Movable Supporting Member Prevents Disengagement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing roller device in image forming apparatuses experiences undesired disengagement of the pickup roller due to external forces applied to the holding member's side walls during roller replacement, leading to operational failures in image forming processes.
Innovation Solution
The roller device incorporates a supporting member with a movable supporting portion that can shift between positions to securely hold or disengage the roller's end portion, and an engaging portion that interacts with the main body to prevent accidental disengagement, along with a regulating portion to restrict unwanted movement during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the holding member is designed to be easily removable from the main body for roller replacement, then the ease of operation is improved, but the reliability deteriorates due to potential disengagement of the pickup roller from the holding member
Solution Approach 1:
The holding member is designed with movable side walls that can dynamically adjust their position. The side walls can move in the axial direction to facilitate roller insertion and removal, while maintaining a secure hold on the roller during operation. This dynamic capability allows the structure to adapt between replacement mode (high ease of operation) and operation mode (high reliability).
Solution Approach 2:
The holding member is divided into functional segments: the body portion, the movable side walls, and the regulating portion. The side walls are segmented from the main body, allowing independent movement. This segmentation enables the side walls to move freely during roller replacement while the regulating portion maintains engagement with the main body during operation, thus resolving the contradiction between ease of replacement and operational reliability.
2Ease of operation
If the side walls of the holding member are made movable to facilitate roller replacement, then the ease of operation is improved, but the structural stability deteriorates due to potential deformation under external force
Solution Approach 1:
The regulating portion acts as an intermediary element between the movable side walls and the main body. It mediates the interaction by providing a stable engagement point with the main body while allowing the side walls to move independently. This intermediary structure enables the side walls to be movable for ease of replacement without compromising the overall structural stability during operation.
Solution Approach 2:
The side walls are designed with dynamic movability in the axial direction, allowing them to shift position during roller replacement. This dynamic characteristic enables easy operation while the regulating portion maintains structural stability during normal operation by engaging with the main body and preventing unintended movement.
3Ease of operation
If the supporting portion is allowed to move freely within a large range, then the ease of operation for roller replacement is improved, but the reliability deteriorates due to increased risk of accidental disengagement
Solution Approach 1:
The supporting portion is designed with controlled dynamic movement, allowing it to move within a specific range during roller replacement while maintaining engagement during operation. This controlled dynamics enables easy replacement while preventing accidental disengagement through the regulating portion's engagement with the main body.
Solution Approach 2:
The regulating portion serves as an intermediary that controls the movement range of the supporting portion. It allows the supporting portion to move sufficiently for easy roller replacement while preventing excessive movement that could lead to accidental disengagement. The intermediary structure thus balances ease of operation with reliability.
Data Source
AI summary
A roller device may include a main body, a first roller configured to rotate around an first axis line extending in a predetermined axial direction, the first roller including an end portion in the axial direction, and a supporting member including a first supporting portion configured to rotatably support the end portion of the first roller and an engaging portion configured to engage the main body. Further, the main body including a regulating portion disposed inside the movable range when the supporting member is located at a third position and disposed outside the movable range when the supporting member is located at a fourth position.