Developing Device Bearing Retention via Dual Regulators
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Solution Overview
Problem
Conventional developing devices face issues with the bearing falling from the holder during attachment or detachment, leading to potential damage and assemblability problems.
Innovation Solution
The developing device incorporates a rotator with a bearing supported by a holder, featuring a first regulator to prevent the bearing from falling towards one end and a second regulator to prevent it from falling towards the other end, ensuring secure attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bearing is disposed on a face plate to support a rotating shaft, then the rotating shaft can rotate smoothly, but the bearing may fall from the face plate during attachment or detachment
Solution Approach 1:
The face plate is segmented into multiple regions: a holding region that secures the bearing during operation, and a release region that allows easy detachment. The holding region includes positioning structures such as recesses or protrusions that engage with corresponding features on the bearing, while the release region provides clearance for bearing removal without requiring complex tools or procedures.
Solution Approach 2:
The face plate is pre-configured with positioning structures (such as recesses, protrusions, or guiding features) that automatically guide the bearing into the correct position during attachment. This preliminary arrangement of structural features ensures the bearing is properly seated before final securing, preventing misalignment and facilitating smooth attachment and detachment operations.
2Ease of operation
If the holder structure is simplified for easy attachment and detachment, then assembly becomes easier, but the bearing may fall toward one end side
Solution Approach 1:
The face plate exhibits local quality variations: the holding region features localized geometric structures (recesses, protrusions, or engagement features) that provide strong bearing retention, while other regions maintain simplicity for ease of assembly. This localized structuring ensures bearing stability at critical positions without requiring complex structures throughout the entire face plate.
Solution Approach 2:
The face plate employs asymmetric design where the holding region has non-uniform structural features (such as one-sided recesses or directional protrusions) that prevent bearing movement in specific directions. This asymmetric configuration naturally guides the bearing to remain centered and prevents it from falling toward any particular end side, while maintaining overall structural simplicity.
3Ease of operation
If the holder structure is simplified for easy attachment and detachment, then assembly becomes easier, but the bearing may fall toward the other end side
Solution Approach 1:
The face plate exhibits local quality variations: the holding region features localized geometric structures (recesses, protrusions, or engagement features) that provide strong bearing retention, while other regions maintain simplicity for ease of assembly. This localized structuring ensures bearing stability at critical positions without requiring complex structures throughout the entire face plate.
Solution Approach 2:
The face plate employs asymmetric design where the holding region has non-uniform structural features (such as one-sided recesses or directional protrusions) that prevent bearing movement in specific directions. This asymmetric configuration naturally guides the bearing to remain centered and prevents it from falling toward any particular end side, while maintaining overall structural simplicity.
Data Source
Figure 1
Figure 2~3
Figure 4A~5B
AI summary
A developing device (26) configured to develop a latent image formed on a surface of an image bearer (21) includes a rotator (26a), a bearing (26m), a holder (29), a first regulator (26m1), and a second regulator (29a). The rotator includes a rotation shaft (26a20). The bearing supports the rotation shaft. The holder holds the bearing. The first regulator, disposed on any one of the bearing and the holder, regulates movement of the bearing such that the bearing does not fall toward one end side in an axial direction of the rotation shaft relative to the holder. The second regulator regulates movement of the bearing such that the bearing does not fall toward another end side in the axial direction relative to the holder after the bearing is attached to the holder.