Handheld Cutting Tool Torque Control for Automatic Jam Release
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Solution Overview
Problem
Hand-held processing devices, such as power tools and gardening equipment, often experience tool jamming due to blockages, requiring users to manually intervene and adjust controls, which can be inconvenient and inefficient.
Innovation Solution
An automated method and device that independently monitor for blockages, reduce torque when a jamming criterion is detected, and then increase torque to clear the blockage without user intervention, allowing for continuous operation and user notification of jamming through haptic or acoustic signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual intervention is required to release tool blockages, then user control over the device is maintained, but operational continuity is interrupted and user effort increases
Solution Approach 1:
The device automatically detects blockages through monitoring means and releases them through controlled torque reduction and reversal, enabling the system to service itself without user intervention. The control means autonomously manages the entire blockage release process including detecting the blocked state, reducing torque to free the cutting tool, and restoring normal operation.
Solution Approach 2:
The system performs preliminary detection of blockage conditions through monitoring means before complete jamming occurs. By identifying blocked states early and automatically initiating torque reduction, the system prevents full blockage development and maintains continuous operation without requiring user response.
2Productivity
If automated blockage detection and release is implemented, then operational continuity is improved, but device complexity increases
Solution Approach 1:
The control means performs multiple functions including normal torque control, blockage detection through monitoring means integration, automated torque reduction, and torque reversal for blockage release. This multi-functionality consolidates what could be separate complex systems into a single integrated control unit, managing to reduce overall system complexity while achieving automated blockage handling.
Solution Approach 2:
The monitoring means continuously provides feedback on the operational state of the cutting tool to the control means. This feedback loop enables automatic detection of blocked states and triggers appropriate control actions. The system adjusts torque based on real-time feedback, creating a self-regulating mechanism that simplifies the control architecture through intelligent response to sensor data.
Data Source
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AI summary
The invention relates to a method for operating a hand-held processing device (1), wherein the processing device (1) comprises: - a rotating and/or circulating cutting tool (2), - an electric motor drive system (3), wherein the electric motor drive system (3) is configured to generate a torque (M) for driving the cutting tool (2), and - a user-operated control element (4), wherein the method comprises the steps: a) automatically monitoring whether a blocking criterion (BC) is met, wherein the blocking criterion (BC) is characteristic of a blockage of the cutting tool (2), and b) if the blocking criterion (BC) is met and the control element (4) is operated, automatically reducing the torque (M) generated by the electric motor drive system (3) and subsequently automatically increasing the torque (M) generated by the electric motor drive system (3).