Photo-interruptor Guide Rib for Snap-fit Alignment
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Solution Overview
Problem
Existing photo-interruptor units in printers are prone to engagement failure due to external forces during snap-fitting, leading to defective products and reduced productivity, and previous solutions may cause damage to snap-fitting components if misaligned.
Innovation Solution
A photo-interruptor unit with a supporting portion featuring a guide rib and a regulating rib that guides the hook portion to ensure proper alignment and prevent disengagement, allowing for secure attachment without damaging the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If snap-fitting the hook portion to the engagement hole without additional guide structures, then the assembly process is simple, but engagement failure occurs when external force is applied during assembly
Solution Approach 1:
A guide rib is introduced as an intermediary element between the hook portion and the engagement hole. The guide rib protrudes from the supporting portion and guides the hook portion during insertion, ensuring proper alignment and preventing engagement failure when external force is applied, while maintaining relatively simple overall structure.
2Reliability
If providing a guide rib to prevent engagement failure, then engagement reliability is improved, but the snap-fitting component may be damaged if misaligned during assembly
Solution Approach 1:
The guide rib is designed with specific local characteristics: it protrudes from the supporting portion at a position that guides the hook portion elastically in the deformation direction, and its height is configured to be lower than the light emitting component and photosensing portion. This local quality design ensures guidance function while preventing damage to the snap-fitting component during assembly.
3Productivity
If the hook portion is freely inserted without guidance, then the assembly process is fast, but the photo-interruptor position cannot be regulated causing potential misalignment
Solution Approach 1:
The guide rib serves as a mediator that maintains fast assembly while ensuring positioning precision. It guides the hook portion during insertion and regulates the photo-interruptor position in the movement direction, ensuring the hook portion is properly overlapped with the engagement hole without requiring complex alignment procedures.
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
The solution effectively prevents engagement failure and damage to the snap-fitting components by regulating the position of the photo-interruptor, ensuring reliable attachment and maintaining productivity by reducing the need for reassembly.
Implementation Method 1
a hook portion configured to deform elastically in a deformation direction
Implementation Method 2
a light emitting component configured to emit light, a photosensing portion configured to receive light emitted from the light emitting component
Data Source
AI summary
A photo-interruptor unit includes a photo-interruptor and a supporting portion to detachably support the photo-interruptor. The supporting portion includes a hole which is formed on an attaching surface and through which a hook portion is inserted, and a guide portion to protrude from the attaching surface and guide the hook portion so that it deforms in a deformation direction when the photo-interruptor is moved in a movement direction intersecting an insertion direction. A regulating portion protrudes from the attaching surface and forms continuously with the guide portion to regulate a position in the movement direction of the photo-interruptor. The guide portion includes a first rib portion and a second rib portion that oppose one another in the deformation direction, and a distance between the first rib portion and the second rib portion in the deformation direction narrows toward a downstream direction of the movement direction.