Work Machine Feeder Position Detection Mechanism
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Solution Overview
Problem
Existing driving tools face the challenge of preventing blank firing when the remaining number of fasteners is less than a predetermined number, which can result in damage to the push lever or feeder due to strong pressing, and complicate the tool's structure with external wiring for sensor connections.
Innovation Solution
A work machine design that includes a feeder detection part at the ejection part, allowing for detection of the feeder's position and prohibiting the striking part's operation when the feeder is at a prohibition position, thus preventing blank firing without complicating the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is provided at the magazine to detect the feeder position, then the remaining number of fasteners can be detected, but the wiring material is extended to the outside of the housing and the structure becomes complicated
Solution Approach 1:
The patent merges the feeder detection function with the ejection part by providing the feeder detection part at the ejection part rather than at the magazine. This integration eliminates the need for extended wiring materials and reduces structural complexity while maintaining the ability to detect feeder position and prevent blank firing.
2Reliability
If the feeder and push lever contact each other when remaining number of fasteners is less than predetermined number, then blank firing is prevented, but the push lever or feeder may be damaged when strongly pressed
Solution Approach 1:
The patent introduces an intermediary detection mechanism where the feeder detection part detects the feeder position before contact occurs. When the feeder is at the prohibition position, the control unit prohibits striking operation in advance, preventing the harmful contact between the push lever and feeder while maintaining blank firing prevention.
3Device complexity
If the feeder detection part is provided at the ejection part, then the structure remains simple without external wiring, but the detection mechanism must be integrated into the ejection part
Solution Approach 1:
The ejection part is designed to serve multiple functions: it performs the ejection operation and also houses the feeder detection part for position detection. This multi-functionality allows the ejection part to integrate the detection mechanism without requiring separate external components, maintaining structural simplicity while enabling blank firing prevention.
Data Source
AI summary
In a driver machine 10, a blank firing prevention mechanism 100 has a feeder position sensor 105 that detects the prohibition position of a feeder 64 of a magazine 60. When a control unit 20 detects the prohibition position of the feeder 64 on the basis of a detection signal from the feeder position sensor 105, the control unit 20 prohibits driving of a motor 52. Thus it is possible to prevent blank firing of a striking part 44. The feeder position sensor 105 is provided to an ejection part 34. Thus it is unnecessary for a wire, which connects the control unit 20 and the feeder position sensor 105, to be extended to the outside of a housing 14, in comparison with a structure in which the feeder position sensor 105 is provided in a magazine case 62 of the magazine 60.