Laser Shutter Linkage for Synchronized Interlock Switching
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Solution Overview
Problem
Conventional image forming apparatuses face issues with the synchronization of laser shutter and interlock switch operations due to torsional rigidity requirements and restricted switch placement, leading to potential timing discrepancies and complex mechanisms.
Innovation Solution
An image forming apparatus with a link mechanism that integrates a laser shutter and interlock switch, where the laser shutter's first engaging portion is on the scanner unit's side surface and the interlock switch's second engaging portion is opposing, allowing for synchronized operation without complex mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening/closing cover is made rigid to prevent torsion during operation, then the synchronization between laser shutter and interlock switch is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention separates the operation mechanisms of the laser shutter and interlock switch by providing distinct engagement portions on the opening/closing cover. The first engagement portion operates the laser shutter while the second engagement portion operates the interlock switch independently, eliminating the need for high torsional rigidity to synchronize their operations.
Solution Approach 2:
The patent introduces a link mechanism as an intermediary component that connects the opening/closing cover to both the laser shutter and interlock switch. This link mechanism ensures synchronized operation through mechanical coupling while allowing the cover itself to remain less rigid, as the synchronization is achieved through the link rather than cover rigidity.
2Ease of operation
If the interlock switch is placed near the opening/closing cover to simplify the mechanism, then the ease of operation is improved, but the adaptability of switch placement position is restricted
Solution Approach 1:
The opening/closing cover is designed with multiple engagement portions that can operate different components (laser shutter and interlock switch). This universal design allows the cover to interact with multiple components at different positions, increasing the flexibility of component placement while maintaining ease of operation.
Solution Approach 2:
The patent extends the interaction from a single-point engagement to multi-point engagement in different spatial dimensions. By providing engagement portions at different locations on the opening/closing cover, the system allows components to be placed at various positions while still being operable by the same cover movement.
Data Source
AI summary
An image forming apparatus includes a scanner unit, a laser shutter including a first engaging portion and to shield a laser light from the scanner unit, an opening/closing member to a main assembly, a link operable in interrelation with the opening/closing member and an interlock switch including a second engaging portion and to turn on or turn off a high voltage power source. The link includes a third engaging portion engaged with the first engaging portion of the laser shutter and a fourth engaging portion engaged with the second engaging portion of the interlock switch. The first engaging portion of the laser shutter is disposed on one side surface of a casing of the scanner unit. The second engaging portion of the interlock switch is disposed at a position opposing the one side surface.