Cam-Driven Wire Cutter With Controlled Blade Force
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Solution Overview
Problem
Existing wire cutting tools for cable trays lack control over the force applied to the cutters, leading to inefficient power use and potential tool damage from excessive force, or ineffective cutting due to insufficient force.
Innovation Solution
A cutting tool with a cam drive mechanism powered by a motor, featuring a radial cam and shuttle system that applies a controlled cutting force between 10-12 kiloNewtons, adjustable via a torque limit clutch mechanism or electronic clutch circuit, ensuring precise force application for efficient wire cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a known cutter is used for cutting wires of wire mesh cable tray, then the cutting function is provided, but there is no control over the force applied leading to inefficient power use and possible tool damage
Solution Approach 1:
The patent applies parameter changes by implementing a cam mechanism with adjustable cam profiles that directly control the cutting force parameter. The cam mechanism transforms rotational motor motion into controlled linear motion of the cutting blade, allowing precise adjustment of force parameters (10-12 kiloNewtons) to optimize power use efficiency while maintaining effective cutting capability.
Solution Approach 2:
The patent replaces uncontrolled manual or simple mechanical cutting systems with a cam-driven mechanical control system. The cam mechanism provides automatic force control through its geometric profile, substituting the need for manual force management with a deterministic mechanical control system that inherently limits and optimizes cutting force application.
2Reliability
If excessive force is applied to the cutters, then the wire cutting capability is ensured, but tool damage and inefficient power use occur
Solution Approach 1:
The patent applies beforehand cushioning by designing the cam mechanism with built-in force limiting capabilities that prevent excessive force application before it can cause tool damage. The cam profile geometry inherently cushions and limits the maximum force transmitted to the cutting blade, protecting the tool from damage while maintaining sufficient cutting capability.
Solution Approach 2:
The patent uses parameter changes by adjusting cam profile parameters to control the force transmission characteristics. By modifying cam geometry parameters (radius, profile shape, lift), the system optimizes the force parameter to maintain reliability and prevent tool damage while ensuring adequate cutting performance.
3Productivity
If insufficient force is applied to the cutters, then power use efficiency is improved, but the wire cannot be severed
Solution Approach 1:
The patent applies parameter changes by precisely adjusting cam profile parameters to optimize the cutting force parameter within the optimal range of 10-12 kiloNewtons. This parameter optimization ensures that sufficient force is applied to sever wires effectively while avoiding excessive force that would waste energy, thereby maximizing productivity with efficient power use.
Solution Approach 2:
The patent replaces inefficient uncontrolled cutting systems with a cam-driven mechanical control system that automatically optimizes force application. The cam mechanism substitutes manual force control with a deterministic mechanical system that inherently delivers the optimal force parameter for maximum cutting effectiveness per unit of energy consumed.
4Force
If a cam drive mechanism with torque limit clutch is used, then controlled cutting force is achieved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the cam mechanism to perform multiple functions simultaneously: it provides cutting motion, controls cutting force through cam profile geometry, and incorporates torque limiting through the clutch mechanism. This multi-functionality reduces the need for separate control systems, thereby managing device complexity while achieving precise force control.
Solution Approach 2:
The patent uses the clutch mechanism as an intermediary between the motor and the cam drive system. The clutch acts as a torque-limiting intermediary that protects the system from excessive forces while allowing the cam mechanism to perform its force control function, thereby managing overall system complexity through functional decomposition.
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 cuts wires with controlled force, preventing damage to the tool and ensuring efficient power use, allowing for easy handling and repeated cutting operations without the need for additional sensors or electronic controls.
Implementation Method 1
a cam drive mechanism (20) disposed within the housing (11) and including a radial cam (21) keyed to and driven by the output spindle (21S) and a roller assembly (25R) contacting the radial cam (21) and keyed to a shuttle (24)
Implementation Method 2
A spring (25S) may abut a ring (24R) disposed on the shuttle (24) and roller assembly (25R), thus biasing the roller assembly (25R) (and thus the shuttle (24)) towards the radial cam (21)
Implementation Method 3
a motor (15) for driving the cam drive mechanism (20). A power tool battery pack (12) is removably attached to the housing (11) and electrically connected to the tool (10) in order to power the motor (15)
Data Source
Figure 1~2A
Figure 2B~3
Figure 4~6A
AI summary
A cutting tool (10) includes a housing (11), a head assembly (30) disposed on the housing and carrying a first blade (33). A cam drive mechanism (20) is disposed within the housing. The cam drive mechanism carries a second blade (26) opposed to the first blade. A motor (15) drives the cam drive mechanism. A battery pack (12) is electrically connected to the motor. The cam drive mechanism moves the second blade towards the first blade, so that a wire (W) disposed between the first and second blades receives a cutting force of less than 12 kiloNewton. The cam drive mechanism may include a spindle (21S) driven by the motor, a radial cam (21) fixed to the spindle, a roller assembly contacting the radial cam, and a shuttle connected to the roller assembly, the shuttle being movable in a reciprocating motion and carrying the second blade.