Sheet Feed Roller Coupling Geometry for Easy Drive Alignment
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Solution Overview
Problem
Existing drive transmitters in image forming apparatuses face challenges in easy replacement and proper assembly of sheet feed rollers, leading to potential paper jams and operational issues due to complex alignment requirements and poor visual recognition during maintenance.
Innovation Solution
A drive transmitter design featuring a coupling portion with grooves spaced at 180 degrees and projections that are easily insertable, including a guiding and non-guiding portion to facilitate alignment and reduce contact resistance, along with a biasing mechanism to assist in assembly and disassembly, ensuring proper engagement between the sheet feed roller and drive shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional coupling portion with grooves and projections is used, then the sheet feed roller can be driven, but the alignment during assembly is difficult and requires complex positioning
Solution Approach 1:
The coupling portion employs asymmetric design where one projection is positioned at the apex of the guiding portion while the other projection is at the apex of the non-guiding portion. This asymmetric arrangement creates a unique alignment state that is easily recognizable during assembly, eliminating the need for complex alignment procedures while maintaining proper driving connection.
Solution Approach 2:
The guiding portion is pre-configured with a sloped surface that automatically guides the projection into the groove during the assembly process. This preliminary guiding action occurs before final engagement, ensuring that the components align correctly without requiring manual positioning or complex alignment procedures by the assembler.
2Ease of repair
If the sheet feed roller is made easily replaceable, then maintenance is simplified, but the driving connection may become unreliable
Solution Approach 1:
The asymmetric positioning of projections relative to the guiding and non-guiding portions creates a unique engagement state that is both easy to assemble and reliable. The projection at the apex of the guiding portion ensures positive engagement, while the asymmetric configuration prevents misalignment, thereby maintaining driving connection reliability during replacement.
Solution Approach 2:
The coupling portion design allows the projection to self-align and self-engage with the groove through the sloped guiding portion during assembly. This self-service mechanism ensures reliable driving connection without requiring complex assembly procedures or specialized tools, making replacement easy while maintaining reliability.
3Ease of operation
If the guiding portion is sloped to facilitate alignment, then assembly is easier, but contact resistance may increase
Solution Approach 1:
The guiding portion is designed with a sloped surface only in the specific region where alignment is needed, while the engagement region maintains precise geometry. This local differentiation allows the sloped guiding surface to facilitate easy alignment without compromising the manufacturing precision and contact resistance characteristics in the critical engagement area between projection and groove.
Solution Approach 2:
The asymmetric configuration of the guiding and non-guiding portions with projections positioned at their respective apexes creates a balanced design where the sloped guiding portion facilitates alignment while the overall asymmetric structure ensures proper engagement geometry is maintained, minimizing contact resistance despite the sloped alignment surface.
Data Source
AI summary
A drive transmitter includes a first unit including a coupling portion having grooves spaced at an angle of 180 degrees in the rotational direction, and a second unit having projections spaced at an angle of 180 degrees in the rotational direction. The projections are configured to be inserted into the grooves of the coupling portion. The coupling portion has a guiding portion and a non-guiding portion. The guiding portion is sloped, with a height from a bottom face of the grooves decreasing in the rotational direction of the first unit, and is configured to guide the projections to the grooves. The non-guiding portion is disposed at a point symmetrical position to the guiding portion to an axial center of the first unit. One of the projections is not in contact with the non-guiding portion while another one of the projections is in contact with the guiding portion.