Door Detection Apparatus Sliding Shaft Conversion
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Solution Overview
Problem
Conventional door opening or closing detecting apparatuses face challenges in ensuring accurate detection and space efficiency, particularly when installed near the hinge portion of a door, leading to potential detection failures and increased risk of component malfunctions due to insufficient moving strokes for sensors.
Innovation Solution
A door opening or closing detecting apparatus that utilizes a conversion mechanism to convert door rotation into sliding motion of a shaft member, allowing for detection by a detecting portion, and incorporates a pressure contact member with tapered surfaces to ensure reliable detection and power supply interruption with a time lag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detecting portion is provided on the side portion or upper portion of the door to obtain large displacement amount, then detection accuracy is enhanced, but the apparatus increases in size and installation becomes difficult
Solution Approach 1:
The patent transforms the detection mechanism from relying on rotational displacement at the door edge to utilizing sliding displacement along the rotation axis direction. By providing a sliding groove and pressing member that moves linearly along the axis rather than rotating at the periphery, the system achieves sufficient detection displacement without requiring additional space on the door's side or upper portions.
Solution Approach 2:
The invention creates an alternative detection mechanism that copies the essential function of edge-based detection but implements it through a different physical principle. Instead of measuring rotational movement at the door edge, it measures linear sliding movement of a pressing member along the rotation axis, achieving the same detection purpose with compact dimensions.
2Area of stationary object
If the door opening or closing detecting apparatus is provided in the vicinity of the hinge portion to save space, then apparatus size is reduced, but the moving stroke of the pressing member or shielding flag cannot be ensured leading to detection failure
Solution Approach 1:
The patent resolves the insufficient stroke problem by changing the motion dimension from rotational arc movement to linear sliding movement. The pressing member slides along the rotation axis in a linear direction rather than following the circular arc of door rotation, maximizing the use of limited space near the hinge while ensuring adequate detection stroke.
Solution Approach 2:
The system dynamically adapts the detection mechanism to the limited space available near the hinge. The sliding groove and pressing member configuration allows the detection apparatus to utilize the door's retraction space effectively, converting the constrained rotational movement into sufficient linear displacement for reliable detection.
3Area of stationary object
If a switch type sensor is used at the hinge portion to solve displacement amount problem, then space is saved, but the moving stroke cannot be ensured leading to detection failure
Solution Approach 1:
The patent introduces a sliding groove as an intermediary mechanism between the door rotation and the switch sensor. This sliding groove acts as a mediator that converts the limited rotational movement into sufficient linear displacement, ensuring the pressing member can reliably activate the switch type sensor even in the constrained space near the hinge portion.
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 enables reliable detection of door opening and closing while minimizing apparatus size and ensuring accurate detection, even in restricted spaces near the hinge portion, thereby preventing component malfunctions and maintaining operational safety.
Implementation Method 1
a door opening or closing detecting apparatus using a photo interrupter as a detecting portion
Data Source
AI summary
A door opening or closing detecting device and an image forming apparatus including a shaft member which is provided to a housing slidably along one end of a door, and urged to be brought into pressure contact with a pressing member through a pressure contact member, the shaft member being slid by the pressing member which moves with the opening/closing of the door. The opening/closing of the door is detected by a detecting portion according to sliding of the shaft member, and a power supply is interrupted by a switch portion. The door opening or closing detecting apparatus and the image forming apparatus are capable of reliably detecting the opening/closing of the door and appropriately interrupting the power supply while achieving space saving and reduction in size of the apparatus.