Autofeed Screwdriver Motor Cutoff for Overdrive Prevention
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Solution Overview
Problem
Existing autofeed screwdriving tools continuously spin the drive bit, leading to unnecessary energy consumption and weight, and lack a mechanism to prevent overdriving screws into a workpiece.
Innovation Solution
An autofeed screwdriving tool with a motor cutoff subassembly that uses a sensor to stop and start the motor without a clutch, reducing energy consumption and tool length by temporarily disabling the motor during each driving stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the motor is continuously spun during operation, then the drive bit remains ready to drive screws, but energy consumption increases and battery life decreases
Solution Approach 1:
The motor operates periodically rather than continuously - it runs during screw driving cycles and stops during idle periods between cycles. The controller monitors the operational state and activates the motor only when needed, significantly reducing overall energy consumption while maintaining operational readiness.
2Reliability
If a clutch is used to stop the drive bit, then overdriving is prevented, but the tool length and weight increase
Solution Approach 1:
The mechanical clutch system is replaced with an electronic control system. The controller receives signals from a sensor that detects when the screw has been fully driven, and electronically stops the motor based on this feedback, eliminating the need for a mechanical clutch and its associated space and weight.
Solution Approach 2:
A sensor provides feedback to the controller about the screw driving status. When the screw reaches full penetration or the workpiece surface is contacted, the sensor signals the controller, which then stops the motor to prevent overdriving, replacing the need for mechanical overdrive prevention mechanisms.
3Use of energy by moving object
If the motor is stopped between driving cycles, then energy consumption is reduced, but the tool requires a control system to manage motor activation
Solution Approach 1:
The system automatically manages motor activation and deactivation based on sensor feedback without requiring manual intervention. The controller monitors the screw driving process and autonomously controls motor operation, reducing energy consumption while maintaining simple operation for the user.
Data Source
AI summary
A clutchless autofeed screwdriving tool designed to prevent overdriving screws into a workpiece. A user positions the tool onto a workpiece and presses down on a nosepiece, which then retracts a slide body inside the tool. The tool includes a sensor that, when contacted by a rear portion of the slide body, sends a first signal to a controller to stop a motor. Once the motor stops, a drive bit also stops rotating, thereby preventing overdriving a screw into a workpiece. The user then removes the tool from the workpiece, and the slide body automatically extends. When the slide body moves out of contact with the sensor, the sensor sends a second signal to the controller to start the motor, which then starts the drive bit rotating again.