Stapler Effort-Saving Arm Assembly
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Solution Overview
Problem
Conventional staplers require significant user effort to penetrate staples through paper sheets, leading to discomfort during frequent stapling due to the need for a large force application.
Innovation Solution
A stapler design incorporating two leverage mechanisms, where a first arm with inclined grooves and a second arm with protrusions generate a large force to push staples through paper sheets, allowing for reduced effort from the user by applying a smaller force on the first arm, leveraging the pivoting motion and spring assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional single arm mechanism is used to push staples through paper sheets, then the structure is simple, but the user must apply large force leading to discomfort during frequent stapling
Solution Approach 1:
The single arm mechanism is divided into two separate arms (first arm and second arm) that work in sequence. The first arm pivots about a first pivot point and transfers motion to the second arm, which pivots about a second pivot point to push the staple. This segmentation allows each arm to be optimized for its specific function, reducing the force required at the user interface while maintaining the necessary driving force at the staple.
Solution Approach 2:
The first arm acts as an intermediary mechanism between the user's input force and the second arm that directly pushes the staple. By introducing this intermediate arm with its own pivot point, the system can transform the user's input motion into a different motion pattern that requires less force, while the second arm converts this back into the high-force motion needed for stapling.
2Force
If the arm length and pivot points are optimized for leverage, then force multiplication is improved, but the device complexity increases with additional arms and pivot mechanisms
Solution Approach 1:
The system uses dynamic motion transformation rather than static leverage. The first arm and second arm have different pivot points that are positioned to create optimal force multiplication at each stage of the motion. The arms move through different arcs and at different speeds, dynamically adapting the force application to maximize efficiency while minimizing the required input force.
Solution Approach 2:
Instead of simply extending the arm length in one dimension to gain leverage, the invention adds a second dimension by introducing a sequence of two arms with different pivot points. This multi-dimensional approach to motion transformation provides force multiplication without requiring excessively long arms or complex mechanical advantage systems.
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
Enables efficient stapling with reduced user discomfort by generating a large force to penetrate staples with minimal effort, making the stapling process more comfortable and efficient.
Implementation Method 1
two leverage mechanisms are employed to generate a large force to the staples while only limited force is applied to the arm
Data Source
AI summary
A stapler includes a base which has two connection plates on a top thereof and each connection plates include three holes. A magazine has one end pivotably connected to the hole located at the rear end of the base and staples are received in the magazine. A first arm has two grooves in the two sidewalls of the rear end thereof and is pivotably connected to the second hole of the connection plates. A second arm located between the first arm and the magazine, a rear end of the second arm movably engaged with the two grooves in the first arm. The second arm is pivotably connected to the third holes of the connection plates.