Fastener Driving Tool Electrical Control System
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Solution Overview
Problem
Conventional pneumatically powered fastener driving tools are inefficient in using compressed gas, leading to a short operational life and limited commercial application due to mechanical mechanisms that do not effectively manage the power cycle.
Innovation Solution
A pressurized fluid-powered fastener driving tool with an electrical control circuit and solenoid valve for precise dosing of compressed fluid, combined with energy recycling and an anti-siphon device to prevent liquid ingress, along with a magnetically controlled workpiece contact element for improved efficiency and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a mechanical mechanism is used to trigger and power the fastener driving power cycle, then the tool can operate with a portable compressed gas source, but the operational life of the tool is relatively short due to inefficient use of compressed gas
Solution Approach 1:
The patent replaces the conventional mechanical trigger mechanism with an electrical control system comprising a microprocessor, control circuit, and solenoid valve. This substitution enables precise electronic control of compressed gas flow, allowing the system to dose gas accurately and recycle it efficiently, thereby extending operational life while reducing gas waste.
Solution Approach 2:
The patent implements a gas recycling system where compressed gas is captured and reused rather than discarded after a single use. The control system redirects and recycles gas back into the drive cylinder, maximizing the utilization of the limited portable gas supply and significantly extending the tool's operational duration.
2Reliability
If compressed liquid flows into the tool, then the performance is impeded, but preventing liquid ingress requires additional anti-siphon devices
Solution Approach 1:
The patent introduces an anti-siphon device as an intermediary component between the compressed gas/liquid source and the tool's internal system. This device acts as a selective filter that allows gas to pass through while blocking liquid, preventing performance impairment without requiring complex liquid detection or response mechanisms.
3Productivity
If conventional mechanical mechanisms are used for power cycle control, then the tool structure remains simple, but productivity is limited due to inefficient power management
Solution Approach 1:
The patent replaces simple mechanical power cycle control with an electrical control system featuring a microprocessor and solenoid valve. This enables precise timing control of gas delivery, optimized power cycle management, and extended operational capabilities, significantly improving productivity despite the increased system complexity.
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 tool achieves longer operational life of the compressed gas supply, enhanced productivity, and improved performance by efficiently managing the power cycle and preventing liquid interference, thus extending the use of the portable power source.
Implementation Method 1
A control program, preferably incorporated in a microprocessor, is connected to the solenoid valve to control the flow of fluid to a piston and driver blade
Implementation Method 2
a magnet is configured for holding the workpiece contact element in a rest position, and returning the element to the rest position after fastener driving
Data Source
AI summary
A fastener driver tool powered by a pressurized power source having a supply of compressed fluid includes a magazine associated with the tool for storing and supplying fasteners to a tool nose. A cylinder in the tool has a reciprocating piston associated with a driver blade sequentially engaging fasteners from the magazine as they are fed into tool nose. A control system is configured for directly electrically controlling a flow of compressed fluid for driving the piston.