Spring-Powered Movable Blade Return Mechanism
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Solution Overview
Problem
Conventional cutting tools are inefficient in returning the movable blade to its initial position after cutting a cable, which slows down the process and hinders rapid repetition of cutting operations.
Innovation Solution
A cutting tool design that incorporates a spring member and pinion gear system, where the spring member stores energy during the cutting process and releases it to quickly return the movable blade to its initial position, utilizing a drive pinion gear and return pinion gear mechanism to facilitate rapid blade movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cutting tools are used without a spring member, then the structure is simpler, but the movable blade returns to initial position slowly reducing productivity
Solution Approach 1:
The spring member is pre-loaded during the cutting stroke to store energy, which is then released to rapidly return the movable blade to its initial position. This preliminary energy storage enables the quick return motion without requiring a separate power source for the return stroke, thereby improving productivity while maintaining acceptable mechanical complexity.
Solution Approach 2:
The cutting tool utilizes the forward cutting stroke itself to load the spring member, and the stored energy automatically powers the return stroke. The system serves itself by converting the work done during cutting into the energy needed for blade repositioning, eliminating the need for additional actuators or power consumption for the return motion.
2Speed
If a spring member is added to return the movable blade quickly, then the cutting speed improves, but the device complexity increases
Solution Approach 1:
The spring member is integrated into the existing blade mechanism, combining the cutting function and the return function into a single mechanical system. The spring is positioned within the blade assembly and works in conjunction with the drive mechanism, merging energy storage and motion control functions without adding separate complex subsystems.
Solution Approach 2:
The spring member introduces dynamic energy storage and release characteristics to the otherwise static or uniformly moving blade system. The spring allows the blade to accelerate rapidly during the return stroke by converting stored potential energy into kinetic energy, achieving high return speed while using a simple elastic element rather than complex actuation mechanisms.
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 the movable blade to be quickly returned to its initial position after cutting, allowing for faster preparation for subsequent cutting operations, thereby enhancing the tool's efficiency and speed.
Implementation Method 1
a spring member that stores energy during operation such that when the stored energy is released a movable blade is returned to its initial position
Data Source
Figure 1
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AI summary
A cutting tool includes a fixed blade (13) having a cutting surface (28) and a movable blade (12) having a cutting surface (23). The movable blade is rotatable between a receiving position in which the cutting surfaces are spaced and a cutting position in which an object disposed between the fixed and movable blades is cut by the cutting surfaces. A return spring member (14) is connected to the movable blade (12). The spring member (14) stores energy when the movable blade (12) is rotated from the receiving position to the cutting position. The spring member (14) returns the movable blade to the receiving position when the stored energy is released.