Developing Cartridge Restriction Part Stabilizes Assembly
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Solution Overview
Problem
The assembling of developing cartridges for electrophotographic image forming apparatuses is unstable and troublesome due to the inability of the developing roller support groove to restrict the frame's movement after the developing roller is attached.
Innovation Solution
A developing cartridge design featuring a housing with a restriction part that engages with an external member to stabilize the assembly process, including a pair of first projecting parts and a conveying rib to guide the movement and secure the housing in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the developing roller support groove is used to support the frame during assembly, then the developing roller can be attached to the frame, but the frame's movement cannot be restricted after the developing roller is attached, making the assembly work unstable and troublesome
Solution Approach 1:
The patent applies the preliminary action principle by providing restriction parts (protrusions) on the housing that engage with restriction grooves on the frame before the developing roller is attached. This preliminary restriction of housing movement prevents instability during subsequent assembly steps, allowing the developing roller to be securely mounted without frame movement issues.
2Ease of manufacture
If a jig is inserted into the developing roller support groove to restrict frame movement during supply roller attachment, then the supply roller can be attached, but the jig must be removed before developing roller attachment, making the assembly process troublesome
Solution Approach 1:
The restriction parts are pre-formed on the housing, eliminating the need to insert and remove a separate jig during assembly. The housing's own protrusions engage with the frame's restriction grooves to provide continuous movement restriction throughout the assembly process, reducing assembly time and complexity.
Solution Approach 2:
The housing itself provides the restriction function through its integrated protrusions, rather than requiring an external jig. The housing's own structure serves to restrict its movement relative to the frame, making the assembly process more efficient and eliminating unnecessary steps.
Data Source
AI summary
A developing cartridge, comprising: a housing; a developing roller; a drive mechanism configured to transmit a driving force to the developing roller; and a restriction part configured to restrict movement of the housing when the restriction part engages with an external member, wherein the housing comprises: a first side wall; and a second side wall spaced from the first side wall in a first direction, wherein the drive mechanism is disposed to the second side wall, wherein: the restriction part is disposed to the first side wall; and the restriction part comprises projecting parts spaced from each other in a second direction perpendicular to the first direction.