Electric Stapler Anvil Geometry for Straight Bending
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Solution Overview
Problem
Conventional staplers have issues with staples bending unevenly and require precise machining, leading to a discontinuous and uncomfortable stapling process, with high user force required for bending staples into straight legs.
Innovation Solution
A stapler design with a stapling head, magazine, and base part that are pivotally connected, using an electric motor and gear chain to drive staples through sheet material and then pivot anvils to bend the staple legs smoothly and continuously, ensuring straight bending with reduced user force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a two-step stapling process is used to achieve straight bent legs, then the bending quality is improved, but the device complexity and manufacturing precision requirements increase
Solution Approach 1:
The patent replaces the conventional mechanical two-step stapling mechanism with a single-step system that uses a specifically shaped anvil member. The anvil's curved surface with a trough configuration performs both the bending and straightening functions simultaneously, eliminating the need for complex synchronized plate retraction mechanisms and achieving straight bent legs through optimized geometry rather than complex mechanical sequencing.
Solution Approach 2:
The patent changes the geometric parameters of the anvil member, specifically designing it with a curved surface and a trough that matches the desired staple leg configuration. By optimizing the anvil's shape parameters (curvature radius, trough depth, and orientation), the system achieves straight bent legs through the physical constraint of the anvil geometry rather than through complex mechanical control of multiple moving parts.
2Shape
If a two-step stapling process is used to achieve straight bent legs, then the bending quality is improved, but the ease of operation deteriorates due to discontinuous action
Solution Approach 1:
The patent implements continuous useful action by designing a single-step stapling process where the driver member and anvil member work together in one continuous motion. The anvil's trough-shaped curved surface guides the staple legs through bending and straightening simultaneously as the driver advances, eliminating the discontinuous two-step process and providing smooth, continuous stapling action that is more comfortable for users.
3Device complexity
If conventional staplers are used to bend staple legs, then the structure is simple, but the force required by the user is excessive
Solution Approach 1:
The patent applies curvature by designing the anvil member with a specifically shaped curved surface and trough configuration. This curved geometry is optimized to guide the staple legs through a natural bending path that reduces the force required from the driver member. The curved surface distributes the bending force more effectively, allowing the system to maintain structural simplicity while significantly reducing the user force needed to achieve straight bent legs.
Data Source
AI summary
An electric stapler (10) is disclosed as including a stapling head (12) with a driver (28), an intermediate magazine (14) for carrying staples each with two legs, a base part (16) carrying two anvils (44), cams (24), and eccentrically mounted wheels (52), in which the stapling head (12), intermediate magazine (14) and base part (16) are movable relative to one another, the eccentrically mounted wheels (52) are rotatable to move the stapling head (12) and intermediate magazine (14) relative to each other and relative to the base part (16) whereby the driver (28) of the stapling head (12) drives a staple away from the magazine (14), and the cams (24) are rotatable to move a movement transmission assembly (30) to move the anvils (44) to bend the legs of the staple.