Drywall Screwdriver Pulse Control for Countersinking Depth

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Solution Overview

Problem

Conventional drywall screwdrivers lack precise control during screw countersinking, often resulting in screws being driven too deeply due to unpredictable torque changes and difficulty in readjustment, especially when not aligned orthogonally with the workpiece.

Innovation Solution

A drywall screwdriver with an electric motor driven by temporally spaced individual pulses, allowing the user to control the screwing operation by moving the screwing tool a predetermined angle of rotation with each pulse, independent of torque, and providing a path-controlled impulse mode for precise countersinking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If continuous rotation mode is used, then productivity is improved, but manufacturing precision deteriorates

Engineering Contradiction:

Improvescrewing speedVSAvoidcountersinking depth control

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies periodic action by operating the electric motor in impulse mode with temporally spaced individual pulses instead of continuous rotation. Each pulse rotates the screwing tool by a predetermined angle, creating a periodic motion pattern that allows the user to control and assess the countersinking process at regular intervals, thereby improving depth control while maintaining productivity.

Inventive Principle:

Principle #19Periodic action

2Manufacturing precision

If impulse mode with temporally spaced pulses is used, then manufacturing precision is improved, but productivity deteriorates

Engineering Contradiction:

Improvecountersinking depth controlVSAvoidscrewing speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent applies partial action by delivering individual pulses that rotate the screwing tool by a predetermined angle (e.g., 5-15 degrees) rather than continuous full-speed rotation. Each pulse provides just enough rotation to advance the screw by a controlled amount, allowing precise depth control while the cumulative effect of multiple pulses achieves the required screwing depth.

Inventive Principle:

Principle #16Partial or excessive action

3Manufacturing precision

If mechanical depth stop is used, then manufacturing precision is improved, but ease of operation deteriorates

Engineering Contradiction:

Improvescrewing depth controlVSAvoiduser control flexibility

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent applies self-service by enabling the user to directly control the screwing process through the impulse mode operation. The user can activate individual pulses, assess the screwing result after each pulse, and decide whether to continue or stop the operation, making the system self-controlled rather than relying on passive mechanical stops that limit user flexibility.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20230116331A1Method of operating a drywall screwdriver, computer program and drywall screwdriver

Publication Date: 2023.04.13 METABOWERKE

AI summary

The invention relates to a method for operating a drywall screwdriver (1), an electric motor (3) of the drywall screwdriver (1) being driven by means of a plurality of temporally spaced individual pulses (11) in order to allow a user to influence the countersinking of a screw (7) in a workpiece (10) in pulses. According to the invention, a screwing tool (8) that is mechanically coupled to the electric motor (3) and can be brought into engagement with the screw (7) is moved further by a predetermined angle of rotation (a) with each of the individual pulses (11).