Movable Cassette Fall Preventer for Seismic Wafer Storage
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Solution Overview
Problem
Substrate cassettes stored on a spare cassette shelf in a processing apparatus are prone to falling during earthquakes due to shaking, posing a risk of damage or loss.
Innovation Solution
A substrate processing apparatus equipped with a container storage system and fall preventers that include movable stoppers, which can transition between a first position allowing container transfer and a second position preventing falling, controlled by a controller to ensure safe storage and transfer during normal operations and seismic events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a substrate cassette is stored on a spare cassette shelf, then it is readily available for transfer, but it may fall from the shelf during earthquakes or shaking
Solution Approach 1:
The fall preventer is designed as a movable component that dynamically transitions between two positions: a first position during normal operations where it does not obstruct cassette transfer, and a second position during seismic events where it activates to prevent falling. This dynamic mechanism resolves the contradiction by adapting the safety function based on operational conditions.
Solution Approach 2:
The fall preventer is positioned and configured to preemptively counteract the harmful effect of cassettes falling during earthquakes. By being pre-installed in a location where it can immediately obstruct the falling path when activated, it provides preliminary protection against the anticipated hazard of seismic events.
2Reliability
If a fall preventer is installed on the spare cassette shelf, then it prevents cassettes from falling, but it may hinder the transfer of cassettes
Solution Approach 1:
The fall preventer incorporates a movable structure that can shift between a first position (retracted) that allows free cassette transfer and a second position (extended) that provides fall protection. This dynamic positioning capability ensures that the safety mechanism does not permanently obstruct normal operations.
Solution Approach 2:
The system performs preliminary action by activating the fall preventer to the protective position in advance of potential cassette placement or during detected seismic events, ensuring protection is in place before any falling risk occurs, while automatically retracting when not needed to maintain transfer efficiency.
3Reliability
If the fall preventer is activated during normal operations, then it provides continuous protection, but it increases interference with apparatus operations
Solution Approach 1:
The fall preventer operates periodically rather than continuously, activating to the protective position only when needed (during seismic events or when cassettes are present on the shelf) and retracting to the non-obstructive position during normal operations. This periodic activation pattern maintains protection when necessary while minimizing interference with productivity during normal operations.
Solution Approach 2:
The system dynamically adjusts the state of the fall preventer based on real-time conditions, transitioning between active protection mode and inactive transfer mode. This dynamic control ensures that protection is provided only when there is actual risk, thereby maintaining high operational efficiency during normal periods.
Data Source
AI summary
There is provided a technique that includes: a container storage configured to store at least one container configured to accommodate substrates; and (b) at least one fall preventer a part of which is installed to be movable between a first position that does not hinder transfer of the at least one container and a second position that prevents the at least one container stored in the container storage or the substrates in the at least one container from falling.