Developing Cartridge Lever Structure for Easier Attachment Positioning
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Solution Overview
Problem
The challenge in existing developing cartridges is the difficulty in positioning the lever during attachment due to an excessively broad movable range, which complicates the assembly process.
Innovation Solution
A developing cartridge design that includes a casing, a developing roller, a boss, and a first lever, where the boss is fitted into a first hole, allowing the casing to move relative to the lever while limiting its movable range, using the lever's shaft as a fulcrum for pivotal movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lever is allowed to move broadly relative to the casing to receive driving force during separation process, then the lever can effectively perform its function, but positioning of the lever becomes difficult during attachment of the developing cartridge to the drum cartridge
Solution Approach 1:
The boss fitted into the first hole acts as an intermediary element between the casing and the lever. This intermediary structure allows the lever to move relative to the casing while the boss confines the movement within a limited range, thus enabling both broad adaptability for receiving driving force and ease of positioning during attachment
Solution Approach 2:
The patent changes the movement parameter of the lever by introducing the boss-hole fitting mechanism. The lever's movement range is transformed from uncontrolled to controlled, allowing it to pivot about the shaft within a limited range defined by the boss dimensions and hole size, thereby resolving the contradiction between movement freedom and positioning accuracy
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
This configuration ensures precise positioning of the lever during attachment, facilitating accurate assembly and enhancing the reliability of the developing cartridge's integration with the drum cartridge.
Implementation Method 1
By fitting engagement of the boss into the first hole, the casing is movable in the second direction relative to the first lever while limiting a movable range of the first lever relative to the casing
Implementation Method 2
The one end portion functions as a point of effort. The another end portion functions as a point of load. The shaft is positioned between the one end portion and the another end portion. The shaft functions as a fulcrum. By the one end portion receiving a driving force, the first lever is pivotally movable about the shaft
Data Source
AI summary
A developing cartridge includes: a casing; a developing roller extending in a first direction; a boss movable with the casing; and a first lever movable relative to the casing. The first lever includes: one end portion functioning as a point of effort; another end portion functioning as a point of load; a shaft functions as a fulcrum and positioned between the one end portion and the another end portion; and a first hole into which the boss is fitted. By the one end portion receiving a driving force, the first lever is pivotally movable about the shaft. A dimension of the first hole in a second direction crossing the first direction is greater than a dimension in the second direction of the boss. In a case where the casing moves in the second direction relative to the first lever, the boss moves in the second direction within the first hole.