Tapered Guide Contact Nose for Vertical Nailing
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Solution Overview
Problem
Conventional nailing machines using compressed air power often result in driver marks on the work surface due to reaction forces, and struggle to drive concrete or steel nails without slanting, especially those with short shafts.
Innovation Solution
A power-driven nailing machine with a contact nose having a leading end discharge port with a straight guide portion longer than the maximum nail size, and a tapered guide face, which is protrusively urged toward the nose body to maintain contact and guide nails vertically, preventing slanting and driver marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a contact nose is provided to maintain contact with the work surface during reaction, then driver marks are prevented, but the guide structure becomes more complex
Solution Approach 1:
The guide structure is segmented into two distinct functional zones: a tapered guide face at the leading end for initial nail engagement and alignment, and a straight guide portion extending backward for maintaining vertical orientation during driving. This segmentation allows each zone to perform its specific function optimally while keeping the overall structure manageable.
Solution Approach 2:
The contact nose acts as an intermediary component between the nose body and the work surface. It maintains continuous contact with the work surface during the reaction force, serving as a mediator that prevents the driver from striking the work surface directly while still allowing the driving force to be transmitted effectively.
2Manufacturing precision
If a straight guide portion longer than maximum nail size is provided, then nails are guided vertically without slanting, but the contact nose length increases
Solution Approach 1:
Different sections of the contact nose have different geometric qualities tailored to their specific functions. The leading end features a tapered guide face with a smaller diameter suitable for initial nail engagement and alignment, while the straight guide portion has a larger diameter to maintain vertical orientation. This local differentiation of geometric properties allows the structure to achieve precise nail guidance without requiring uniform dimensions throughout.
3Object-affected harmful factors
If the contact nose is protrusively urged toward the nose body, then contact with work surface is maintained during reaction, but the mechanism for urging becomes more complex
Solution Approach 1:
The urging mechanism uses a spring to provide a continuous protrusive force that counteracts the reaction force pushing the contact nose away from the work surface. This spring-based counterbalancing mechanism maintains contact in a simple and reliable manner without requiring complex active control systems.
4Ease of operation
If a tapered guide face is provided at the leading end, then nails are smoothly guided into the discharge port, but the guide portion geometry becomes more complex
Solution Approach 1:
The guide portion geometry changes parameters along its length: the tapered guide face at the leading end has a gradually changing diameter that transitions from smaller to larger, providing smooth nail entry and alignment. This gradual parameter change ensures smooth operation without requiring abrupt geometric transitions or complex multi-component assemblies.
Data Source
AI summary
In a power-driven nailing machine for driving a nail disposed within a discharge port 7 of a nose body 6 into a work, a contact nose 13 giving a leading end discharge port 12 for guiding the nail driven from a discharge port 7 of the nose body 6 toward the work is provided to be protrusively urged toward the leading end of the nose body 6. In the leading end discharge port 12 of the contact nose 13, a guide portion 17, 19 longer than a maximum sized nail is formed from the leading end.