Stapler Pusher Backward Movement Prevention
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Solution Overview
Problem
Conventional staplers face issues with guiding staples to prevent buckling due to insufficient spring load, which can lead to forming failures when trying to maintain the pusher in place during staple driving.
Innovation Solution
Incorporating an engaging portion on the forming plate that engages with a receiving portion on the pusher to prevent backward movement, ensuring the pusher remains in place even under greater forces, using inclined surfaces for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring load is increased to push the pusher forward, then the guiding operation is improved, but the resistances of the forming plate and pusher are increased causing forming failure
Solution Approach 1:
The solution divides the guiding function into two independent parts: the spring continues to provide forward pushing force, while a newly added cam mechanism provides backward movement prevention. This segmentation allows each component to be optimized independently, solving the contradiction between needing strong forward push and avoiding excessive resistance during forming.
Solution Approach 2:
The cam mechanism acts as an intermediary element between the pusher and the forming plate. It mediates the interaction by providing a mechanical constraint that prevents backward movement without requiring increased spring load, thus avoiding the formation of excessive resistance while maintaining guiding reliability.
2Reliability
If the spring load is increased to prevent pusher backward movement, then the staple guidance is improved, but the resistances increase resulting in forming failure
Solution Approach 1:
The cam mechanism introduces a dynamic constraint that activates only when needed (when the pusher tends to move backward during staple driving). The cam allows forward movement during forming but prevents backward movement during driving, providing adaptive control that resolves the contradiction between guidance reliability and forming capability.
Solution Approach 2:
The cam mechanism serves as an intermediary that decouples the spring load from the backward movement prevention function. It translates the pushing motion into a constrained motion pattern, allowing the spring to maintain moderate load while still preventing pusher backward movement effectively.
3Ease of manufacture
If the pusher is allowed to move backward under great forces, then the forming resistance is reduced, but the pusher moves away causing buckle
Solution Approach 1:
The solution segments the motion control into two phases: during forming, the cam allows the pusher to move backward freely reducing resistance; during driving, the cam engages to prevent backward movement maintaining alignment. This temporal segmentation resolves the contradiction between forming ease and alignment stability.
Solution Approach 2:
The cam mechanism provides preliminary anti-action by being pre-configured to prevent backward movement only when the staple needs to be driven straight. During the forming phase, no anti-action is applied, allowing easy formation. The cam's geometry is designed in advance to provide the appropriate constraint at the right moment.
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
This solution effectively prevents pusher movement backward, ensuring reliable staple guidance and preventing drive-in failures by maintaining the pusher's position during staple driving, even when forces exceed the spring force.
Implementation Method 1
The pusher always pushes the staple toward the face plate side by means of a spring
Data Source
AI summary
A stapler is provided with: a forming plate (2) configured to form a straight staple (S) into U-shape; a pusher (11) configured to push the formed U-shape staple (S1) in a first direction (Df) toward a driving portion (15); a driver plate (1) configured to drive the staple (S1) within the driving portion (15) toward sheets of paper (P); an engaging portion (27) formed on the forming plate (2); and a receiving portion (20) formed on the pusher (11). The engage portion (27) is configured to engage with the receiving portion (20), during a driving operation of the driver plate (1), so as to prevent the pusher (11) from moving in a second direction (Dr) which is opposite to the first direction (Df).