Battery-Powered Punch Tool With Flywheel-Assisted Sheet Cutting
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Solution Overview
Problem
Existing handheld reciprocating punch tools, or nibblers, generate numerous small, sharp fragments during cutting operations, are limited by the need for AC power or compressed air, and cannot initiate cuts in the middle of a sheet or on closed ducts.
Innovation Solution
A handheld punch tool with a housing, die holder, die, punch, electric motor, and a flywheel mass, such as a fan, that provides rotational inertia to assist in cutting and cooling the motor, allowing for battery-powered operation and the ability to start cuts in the middle of a sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If AC power or compressed air is used to power the punch tool, then sufficient power is provided for cutting, but access and maneuverability are limited by power cords or air hoses
Solution Approach 1:
The patent replaces the mechanical power delivery systems (power cords for AC power, air hoses for compressed air) with a battery-powered electric motor system. This substitution eliminates the physical constraints of cords and hoses, providing unrestricted maneuverability while maintaining sufficient cutting power through the battery-motor-flywheel configuration.
2Productivity
If a reciprocating punch mechanism is used to cut sheet metal, then cutting efficiency is achieved, but numerous sharp fragments are generated that are difficult to clean up
Solution Approach 1:
The patent employs a high-speed reciprocating punch mechanism driven by an electric motor with flywheel, creating rapid vibratory motion that shears material more cleanly. The high-frequency reciprocation reduces material deformation and fragment generation compared to slower punching mechanisms, thereby improving cleanup requirements while maintaining cutting efficiency.
3Device complexity
If the punch tool is designed for edge-only cutting, then the cutting mechanism is simple, but the tool cannot begin cuts in the middle of sheets or on closed ducts
Solution Approach 1:
The patent transforms the static edge-only cutting capability into a dynamic system where the entire tool can be maneuvered to any position on the workpiece. The battery-powered portable design with balanced flywheel enables the user to position and stabilize the tool at any location, allowing cuts to be initiated from the middle of sheets or on closed ducts while maintaining a relatively simple punch mechanism.
4Force
If a flywheel mass is added to the motor shaft to provide rotational inertia for cutting assistance, then cutting performance is improved, but the device complexity increases
Solution Approach 1:
The patent merges the flywheel mass with the motor shaft assembly, creating an integrated rotating component that provides rotational inertia for cutting assistance without requiring separate flywheel mounting structures. This consolidation improves cutting force through increased rotational mass while minimizing the increase in device complexity by combining functions into a single integrated assembly.
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
The tool effectively reduces fragment generation, enhances maneuverability with battery power, and enables starting cuts in the middle of a sheet, improving efficiency and usability.
Implementation Method 1
a flywheel mass coupled for co-rotation with the motor shaft about the motor axis
Implementation Method 2
the fan is rotatable to generate an airflow for cooling the electric motor
Data Source
AI summary
A handheld punch tool includes a housing, a die holder coupled to the housing, a die supported by the die holder, the die and the die holder defining a feed slot therebetween for receiving a workpiece to be cut, a punch configured to reciprocate within the die holder along a punch axis, an electric motor disposed within the housing and having a motor shaft configured to rotate about a motor axis to reciprocate the punch, and a flywheel mass coupled for co-rotation with the motor shaft about the motor axis.