Stapler Lateral Guide Element for Mis-stapling Prevention
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Solution Overview
Problem
Existing staplers face mis-stapling issues due to lateral deflection of the driver arm or staple magazine when greater lateral forces are applied, especially when held in hand, as the current stabilizing measures are insufficient to prevent unwanted staple deformations.
Innovation Solution
An additional stable lateral guide for the staple magazine, comprising a guide element that engages in a floor wall with a circumferential edge part, providing enhanced rigidity and preventing lateral deflection, is integrated into the stapler design. This guide element can be a sheet-metal part or bolt anchored in the anvil arm, ensuring precise guidance and avoiding collisions with the staple pusher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stapler is held in hand during stapling, then portability and ease of operation are improved, but lateral forces cause deflection of the driver arm or staple magazine leading to mis-stapling
Solution Approach 1:
The patent transitions from guiding the staple magazine only in the longitudinal direction to providing guidance in both longitudinal and lateral dimensions. Guide elements are introduced that extend in the lateral direction, creating a two-dimensional guidance system that constrains the staple magazine against lateral deflection while preserving hand-held operability.
Solution Approach 2:
Guide elements act as intermediary components between the staple magazine and the anvil arm. These guide elements transmit and constrain lateral forces, preventing direct transmission of deflection forces to the staple magazine while allowing the stapler to remain portable and easy to operate.
2Reliability
If lateral guides are added to prevent deflection, then stapling accuracy is improved, but device complexity increases
Solution Approach 1:
The guide elements are integrated with existing components of the stapler, such as the anvil arm or staple magazine housing, rather than being separate independent components. This merging approach provides the necessary lateral guidance functionality while minimizing additional structural complexity.
Solution Approach 2:
Guidance features are added only in the specific lateral regions where deflection occurs, rather than reinforcing the entire structure. The guide elements are strategically positioned at critical points where lateral forces are transmitted, providing targeted stability without unnecessary complexity throughout the entire device.
Data Source
AI summary
A stapler has an anvil leg that supports an anvil plate in the front region, a staple magazine which can be swivelled to a limited degree about a transverse pin on a bearing block in the rear region of the anvil leg, and a driver leg which can be swivelled to a limited degree relative to the staple magazine and the anvil leg about the transverse pin. The driver leg supports a driver for guiding the staples through a gap at the front end of the staple magazine. The stapler has at least one guiding element which is arranged between the anvil plate and the bearing block. The guiding element longitudinally extends between the anvil leg and the staple magazine, is fixedly connected to the anvil leg, and is guided in a longitudinally movable manner within a guiding opening in a bottom wall of the staple magazine.