Document Cover Closer Preventing Center Folding via Rotation Resistance
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Solution Overview
Problem
Conventional document cover closers often experience center folding phenomena during normal closing operations, especially with thick documents, and require increased lift operation force to prevent this, which also increases the maximum lift state force.
Innovation Solution
A document cover closer with a pressurizing contact mechanism between the supporting and spring receiving members, featuring first and second pressing portions arranged in parallel, and a rotation resisting mechanism that provides resistance to reverse rotation of the lift member relative to the supporting member, reducing the operation force needed and preventing center folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If increased lift operation force is applied to prevent center folding, then center folding prevention is improved, but maximum lift state force increases
Solution Approach 1:
The pressing portions are positioned specifically at the pressing position on the supporting member, creating localized resistance only where needed to prevent center folding. This localized quality change allows prevention of the harmful folding phenomenon without requiring increased force throughout the entire lifting operation.
Solution Approach 2:
The pressing portions apply preliminary resistance to the lift member at the pressing position before center folding can occur. By providing this preliminary anti-action during the lifting operation, the mechanism prevents the harmful folding effect from developing, thereby improving reliability without requiring excessive maximum force.
2Reliability
If pressing portions are added to prevent center folding, then center folding prevention is improved, but device complexity increases
Solution Approach 1:
The pressing portions are integrated into the supporting member structure, merging the center folding prevention function with the existing supporting framework. This integration allows the mechanism to prevent center folding without adding separate, complex components, thereby maintaining structural simplicity while improving reliability.
Solution Approach 2:
The supporting member with pressing portions serves dual functions: it provides structural support and simultaneously prevents center folding through the pressing portions. This self-service approach eliminates the need for additional dedicated components, reducing device complexity while achieving the reliability improvement.
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 center folding of the document cover during normal opening and closing operations while reducing the operation force required, except at the start of the operation, ensuring stable document coverage and preventing sudden document cover jumps.
Implementation Method 1
an elastic member rotationally urging the lift member in a direction in which the latter moves to overlap the supporting member 31, while urging the supporting member 31 at least in an opening direction of the document cover K
Implementation Method 2
a cam slider 41 slidably housed in the supporting member, with its cam portion 41a abutting against the pressed member 40
Implementation Method 3
the both side plates 31b being coupled via a hinge shaft 32 to the both side plates 30b of the attaching member 30
Implementation Method 4
its both side plates being pivotally attached via a coupling shaft to be rotatable in a direction different from that of the supporting member
Data Source
AI summary
A document cover closer and office equipment using the same are disclosed. The document cover closer includes an attaching part, which includes an attaching base and two side plates. The attaching part is attached to a main body. A supporting part includes a back plate and two side plates. The side plates of the supporting part are rotatably coupled via a hinge shaft to the side plates of the attaching part. A lift part includes a back plate and two side plates. The side plates of the lift part are pivotally attached via a coupling shaft to the free end side of the side plates of the supporting member. An actuating part is provided on the pivotally attaching portion of the lift part so as to rotate about the coupling shaft when the lift part rotates.