Interlock Switch Positioning for Noise Reduction in Image Formers
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Solution Overview
Problem
Conventional image forming apparatus designs often position the primary interlock switch near the locking mechanism, leading to noise interference with the secondary power source due to proximity of the primary electric circuit to the secondary electric circuit, which can negatively affect the operation of the secondary power source.
Innovation Solution
The primary interlock switch is positioned closer to the inlet than the secondary interlock switch, and the secondary power source is placed farther from the inlet, creating a shorter primary electric circuit and separating it from the secondary electric circuit to minimize noise interference, while the locking mechanism is positioned to reduce door deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the primary interlock switch is provided near the locking mechanism, then door deformation is suppressed, but noise interference with the secondary power source occurs
Solution Approach 1:
The patent repositions the primary interlock switch from a location near the locking mechanism to a location near the hinge, utilizing the spatial dimension along the door's length. This dimensional relocation separates the primary electric circuit from the secondary electric circuit, eliminating noise interference while maintaining door structural integrity through alternative support design
2Object-affected harmful factors
If the primary interlock switch is positioned near the inlet, then noise interference is reduced, but door deformation may increase
Solution Approach 1:
The patent introduces a door support structure as an intermediary element between the interlock switch and the door. This mediator absorbs and distributes the reaction force from the interlock switch, preventing door deformation even when the switch is positioned near the inlet away from the locking mechanism, thus resolving the contradiction between noise reduction and structural stability
Data Source
AI summary
An image forming apparatus includes a housing, a door, an inlet, a primary power source, a secondary power source, a primary interlock switch, and a secondary interlock switch. The housing has an opening. The door is hinge-coupled to the housing by a hinge, and opens and closes the opening. The inlet is provided near the hinge. The secondary power source is provided farther from the inlet than the primary power source. The primary interlock switch is provided on a primary electric circuit between the inlet and the primary power source, and is turned off when the door is opened. The secondary interlock switch is provided on a secondary electric circuit between the primary power source and the secondary power source, and is turned off when the door is opened. The primary interlock switch is disposed closer to the inlet than the secondary interlock switch.