Multi-Mode Power Tool Clutch Using Current Slope Fastener Stop Detection

The patent replaces mechanical controls (switches, knobs, dials) with an electronic control system. The controller receives input signals from the user and electronically adjusts clutch torque settings, motor speed, and other parameters without requiring physical manipulation of mechanical components. This substitution eliminates the space requirements and manipulation difficulties of conventional mechanical controls while maintaining full functional control capability.

The electronic control system integrates multiple control functions into a single unified interface. The controller can manage clutch torque, motor speed, rotation direction, and operational modes through one integrated system rather than requiring separate mechanical controls for each function. This multi-functionality approach allows the tool to maintain versatile control capabilities while reducing the number of separate control components needed.

The patent replaces the mechanical clutch control system with an electronic clutch control system. The electronic clutch receives electrical signals from the controller and adjusts clutch torque settings electronically rather than through mechanical linkages. This allows the user to adjust clutch settings with one hand by simply pressing buttons or triggering signals, eliminating the need to manually manipulate mechanical clutch components while maintaining full clutch control flexibility.

The electronic control system automatically manages clutch torque adjustments based on user input signals. When the user selects a desired clutch setting through the electronic interface, the controller automatically translates this input into the appropriate clutch torque configuration without requiring the user to manually adjust mechanical components. This self-service approach simplifies the adjustment process while maintaining clutch control versatility.

The controller provides multiple clutch operational modes (manual, automatic, and semi-automatic) through a single integrated electronic control system. This multi-functionality allows the tool to offer both simple manual control and sophisticated automatic control capabilities without requiring separate mechanical systems for each mode. The electronic controller seamlessly manages different operational modes, providing adaptability in clutch control while maintaining relatively simple device structure.

The clutch control system transitions from static manual-only operation to dynamic multi-mode operation. The electronic controller can switch between manual control mode (where the user directly sets clutch torque), automatic control mode (where the controller automatically manages clutch torque based on sensor feedback), and semi-automatic modes. This dynamic capability enhances clutch operational control versatility while the electronic integration keeps the overall device structure manageable.

The patent replaces potential mechanical sensing systems for detecting fastener stopping position with an electrical current monitoring system. The controller continuously monitors the electrical current drawn by the motor during operation. When the fastener reaches its stopping position, the current signature changes in a characteristic way that the controller can detect. This electrical approach achieves automatic stopping detection without requiring complex mechanical sensors or additional hardware, thus limiting the increase in device complexity.

The motor's electrical current serves as a self-indicating signal for fastener stopping detection. The controller utilizes the existing electrical parameters already present in the system (motor current) to detect the stopping position without requiring separate sensing mechanisms. This self-service approach leverages information already available in the electrical system, achieving automated detection while minimizing additional device complexity.