Cutting Blade Brake Mechanism for Kickback Response
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Solution Overview
Problem
Conventional power cutting machines lack an effective brake mechanism to prevent kickback, especially in electric models without a clutch drum, and existing brake mechanisms are ineffective against sudden kickbacks during operation.
Innovation Solution
A brake mechanism is integrated into the working device of the power cutting machine, actuated by detecting the bounce of the working device due to kickback, applying a brake directly to the cutting blade to prevent or reduce its rotation, applicable to both engine and electric motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brake mechanism is provided in a clutch drum of a centrifugal clutch directly connected to the driving shaft of the engine, then the brake mechanism can stop the rotation of the cutting blade after the engine stops, but it cannot be applied to electric products not requiring clutch drums and is ineffective against kickback during motor operation
Solution Approach 1:
The brake mechanism is designed to be universally applicable to different motor types (engine and electric motor) by positioning it in the working device rather than in a clutch drum specific to engine-driven machines. This allows the same brake mechanism structure to function across different power source configurations.
Solution Approach 2:
The brake mechanism is positioned between the belt transmission mechanism and the cutting blade, acting as an intermediary component. This placement allows it to intercept and stop the cutting blade's rotation regardless of whether the power source is an engine or electric motor, and regardless of kickback occurring during operation.
2Reliability
If the brake mechanism is actuated by detecting a throttle lever not operating after the engine stops, then the brake mechanism can stop the cutting blade rotation, but it is ineffective against kickback which suddenly occurs during cutting work
Solution Approach 1:
The brake mechanism incorporates a detection device that continuously monitors the working device's state during operation. When kickback occurs and the working device bounces up, the detection device immediately detects this state change and activates the brake mechanism, providing real-time feedback-based response to prevent injury.
Solution Approach 2:
The brake mechanism is pre-positioned in the working device and the detection device is continuously monitoring during operation. This preliminary preparation ensures that when kickback suddenly occurs, the brake mechanism can be activated immediately without delay for engine stopping or throttle lever detection.
3Reliability
If the brake mechanism is provided in the main body, then it can stop the cutting blade, but it increases the distance for power transmission and causes delay in stopping the blade
Solution Approach 1:
The brake mechanism is segmented from the main body and integrated directly into the working device. This segmentation allows the brake to be positioned close to the cutting blade, reducing the power transmission distance and enabling faster stopping of the blade when kickback occurs.
Solution Approach 2:
Instead of positioning the brake mechanism in the main body along the power transmission path, the brake is repositioned in a different spatial dimension - directly in the working device at the head end. This dimensional change reduces the distance the brake force must travel to stop the cutting blade.
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 brake mechanism effectively prevents kickback by stopping or reducing the cutting blade's rotation without stopping the motor, applicable to various motor types, and reduces delays in stopping the blade due to intervening components.
Implementation Method 1
When the working device is subject to a large load... the reaction force of the load acts on the cutting blade. Then, the cutting blade provided on the head end of the power cutting machine may be recoiled from the object, which is a phenomenon called as 'kickback'.
Implementation Method 2
a brake mechanism configured to be actuated when the cutting blade is subject to overload and apply a brake to the cutting blade
Data Source
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AI summary
A power cutting machine includes a main body (2) including a motor (10), an arm (3) connected to the main body (2) at its base end and including a belt transmission mechanism (20) configured to transmit drive power of the motor (10), and a working device connected to the head end of the arm (3) and including a cutting blade (5) configured to be rotated by power transmitted via the belt transmission mechanism (20). The working device includes a brake mechanism (30) configured to be actuated when the cutting blade (5) is subject to overload and apply a brake to the cutting blade.