Developing Device Asymmetric Toner Replenishment Opening
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Solution Overview
Problem
Existing image forming apparatuses face challenges in efficiently replenishing toner within the developing device, leading to uneven toner distribution and potential image defects.
Innovation Solution
A developing device with a detachable toner replenishing container, featuring an accommodating portion with a receiving opening on one end side relative to the developing roller's rotational axis, and a stirring member to evenly distribute the toner. The receiving opening is designed to have a wider area when viewed in the rotational axis direction compared to the perpendicular direction, facilitating efficient toner flow and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a receiving opening is provided on the first end side of the accommodating portion to enable toner replenishment, then the ease of operation is improved, but the toner distribution uniformity deteriorates due to uneven toner flow
Solution Approach 1:
The receiving opening is designed with an asymmetric shape where the opening area when viewed in the rotational axis direction is wider than when viewed in the perpendicular direction. This asymmetric configuration optimizes the toner flow path from the replenishment container, ensuring uniform distribution while maintaining ease of operation.
Solution Approach 2:
The patent considers the three-dimensional geometry of the receiving opening by comparing its appearance when viewed along the rotational axis direction versus perpendicular to it. By optimizing the opening area in the rotational axis direction, the invention achieves better toner flow characteristics and distribution uniformity.
2Productivity
If the opening area of the receiving opening is made wider in the rotational axis direction, then the productivity is improved through faster toner replenishment, but the device complexity increases
Solution Approach 1:
The receiving opening is designed with non-uniform dimensions, being wider in the rotational axis direction than in the perpendicular direction. This local variation in opening area optimizes toner flow speed and replenishment efficiency without requiring complex additional components.
Data Source
AI summary
A developing device includes an accommodating portion for accommodating toner, a developing roller and a stirring member. The developing device is for use with an image forming apparatus and detachably mounts a replenishing container for replenishing the toner. The accommodating portion includes a receiving opening through which the toner replenished from the accommodating portion is received in the accommodating portion, the receiving opening being provide on a first end side of the accommodating portion with respect to a rotational axis direction of the developing roller. An opening area of the receiving opening when the developing device is viewed in the rotational direction is wider than the opening area of the receiving opening when viewed in a direction perpendicular to the rotational axis direction.